Blade-coated organic solar cells from non-halogenated solvent offer 17% efficiency

Wei Guan; Dong Yuan; Juntao Wu; Xiaobo Zhou; Hong Zhao; Fei Guo; Lianjie Zhang; Ke Zhou; Wei Ma; Wanzhu Cai; Junwu Chen; Liming Ding; Lintao Hou

doi:10.1088/1674-4926/42/3/030502

J. Semicond. > 2021, Volume 42 > Issue 3 > 030502

SHORT COMMUNICATION

Blade-coated organic solar cells from non-halogenated solvent offer 17% efficiency

Wei Guan¹, Dong Yuan², Juntao Wu¹, Xiaobo Zhou³, Hong Zhao¹, Fei Guo¹, Lianjie Zhang², Ke Zhou³, Wei Ma³, Wanzhu Cai^{1, 2,}, Junwu Chen^2,, Liming Ding^4, and Lintao Hou^1,

+ Author Affiliations

1. Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Siyuan Laboratory, Department of Physics, Jinan University, Guangzhou 510632, China
2. Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
3. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
4. Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing 100190, China

Author Bio:

Wei Guan is an undergraduate student in the Department of Physics, Jinan University. He is working on the printing OPV project under the supervision of Professor Lintao Hou.

Dong Yuan received his BS degree from South China University of Technology in 2018. Now, he is a PhD candidate in Professor Junwu Chen’s group. His research focuses on the new materials for organic solar cells.

Wanzhu Cai is an associate professor in the Department of Physics, Jinan University, since 2017. She received a BS degree in Applied Physics (2007), a PhD degree in Material Physics and Chemistry (2012), both from South China University of Technology. She worked as a postdoc in Professor Fei Huang's group (SCUT) in 2012–2014, and Professor Olle Inganäs's group (LIU, Sweden) in 2014–2017. Her research focuses on materials development, polymer semiconductor processing, and optoelectronic device engineering.

Junwu Chen received his BS degree in 1989 and PhD degree in 1998. After two-year postdoctoral research with Professor Benzhong Tang at Hong Kong University of Science & Technology, he became an associate professor in 2002 and a full professor in 2007 at South China University of Technology. His research focuses on synthesis of organic functional materials and their optoelectronic applications.

Liming Ding got his PhD from University of Science and Technology of China (was a joint student at Changchun Institute of Applied Chemistry, CAS). He started his research on OSCs and PLEDs in Olle Inganäs Lab in 1998. Later on, he worked at National Center for Polymer Research, Wright-Patterson Air Force Base and Argonne National Lab (USA). He joined Konarka as a Senior Scientist in 2008. In 2010, he joined National Center for Nanoscience and Technology as a full professor. His research focuses on functional materials and devices.

Lintao Hou received his PhD degree in 2006 from South China University of Technology. Then he joined Jinan University as a teacher. In 2009–2011, he worked in Linköping University as a postdoc. In 2014, he became a full professor at Jinan University. His research focuses on printed optoelectronic devices and optical simulation.

Corresponding author: Wanzhu Cai, wzhcai@jnu.edu.cn; Junwu Chen, psjwchen@scut.edu.cn; Liming Ding, ding@nanoctr.cn; Lintao Hou, thlt@jnu.edu.cn

DOI: 10.1088/1674-4926/42/3/030502

References

[1]	Duan C, Ding L. The new era for organic solar cells: non-fullerene small molecular acceptors. Sci Bull, 2020, 65, 1231 doi: 10.1016/j.scib.2020.04.030
[2]	Li W, Chen M, Cai J, et al. Molecular order control of non-fullerene acceptors for high-efficiency polymer solar cells. Joule, 2019, 3, 819 doi: 10.1016/j.joule.2018.11.023
[3]	Tong Y, Xiao Z, Du X, et al. Progress of the key materials for organic solar cells. Sci China Chem, 2020, 63, 758 doi: 10.1007/s11426-020-9726-0
[4]	Meng L, Zhang Y, Wan X, et al. Organic and solution-processed tandem solar cells with 17.3% efficiency. Science, 2018, 361, 1094 doi: 10.1126/science.aat2612
[5]	Li H, Xiao Z, Ding L, et al. Thermostable single-junction organic solar cells with a power conversion efficiency of 14.62%. Sci Bull, 2018, 63, 340 doi: 10.1016/j.scib.2018.02.015
[6]	An Q, Ma X, Gao J, et al. Solvent additive-free ternary polymer solar cells with 16.27% efficiency. Sci Bull, 2019, 64, 504 doi: 10.1016/j.scib.2019.03.024
[7]	Duan C, Ding L. The new era for organic solar cells: polymer acceptors. Sci Bull, 2020, 65, 1508 doi: 10.1016/j.scib.2020.05.023
[8]	Duan C, Ding L. The new era for organic solar cells: small molecular donors. Sci Bull, 2020, 65, 1597 doi: 10.1016/j.scib.2020.05.019
[9]	Zhang Y, Duan C, Ding L. Indoor organic photovoltaics. Sci Bull, 2020, 65, 2040 doi: 10.1016/j.scib.2020.08.030
[10]	Liu Q, Jiang Y, Jin K, et al. 18% efficiency organic solar cells. Sci Bull, 2020, 65, 272 doi: 10.1016/j.scib.2020.01.001
[11]	Jin K, Zuo X, Ding L. D18, an eximious solar polymer. J Semicond, 2021, 42, 010502 doi: 10.1088/1674-4926/42/1/010502
[12]	Qin J, Zhang L, Zuo C, et al. A chlorinated copolymer donor demonstrates a 18.13% power conversion efficiency. J Semicond, 2021, 42, 010501 doi: 10.1088/1674-4926/42/1/010501
[13]	Qin J, Zhang L, Xiao Z, et al. Over 16% efficiency from thick-film organic solar cells. Sci Bull, 2020, 65, 1979 doi: 10.1016/j.scib.2020.08.027
[14]	Lin Y, Cai C, Zhang Y, et al. Study of ITO-free roll-to-roll compatible polymer solar cells using the one-step doctor blading technique. J Mater Chem A, 2017, 5, 4093 doi: 10.1039/C6TA10018J
[15]	Lin Y, Jin Y, Dong S, et al. Printed nonfullerene organic solar cells with the highest efficiency of 9.5%. Adv Energy Mater, 2018, 8, 1701942 doi: 10.1002/aenm.201701942
[16]	Liu A, Zheng W, Yin X, et al. Manipulate micrometer surface and nanometer bulk phase separation structures in the active layer of organic solar cells via synergy of ultrasonic and high-pressure gas spraying. ACS Appl Mater Interfaces, 2019, 11, 10777 doi: 10.1021/acsami.8b22215
[17]	Zhao J, Li Y, Yang G, et al. Efficient organic solar cells processed from hydrocarbon solvents. Nat Energy, 2016, 1, 15027 doi: 10.1038/nenergy.2015.27
[18]	Liu F, Ferdous S, Schaible E, et al. Fast printing and in situ morphology observation of organic photovoltaics using slot-die coating. Adv Mater, 2015, 27, 886 doi: 10.1002/adma.201404040
[19]	Zhao W, Zhang Y, Zhang S, et al. Vacuum-assisted annealing method for high efficiency printable large-area polymer solar cell modules. J Mater Chem C, 2019, 7, 3206 doi: 10.1039/C8TC06513F
[20]	Zhao W, Zhang S, Zhang Y, et al. Environmentally friendly solvent-processed organic solar cells that are highly efficient and adaptable for the blade-coating method. Adv Mater, 2018, 30, 1704837 doi: 10.1002/adma.201704837
[21]	Ma Z, Zhao B, Gong Y, et al. Green-solvent-processable strategies for achieving large-scale manufacture of organic photovoltaics. J Mater Chem A, 2019, 7, 22826 doi: 10.1039/C9TA09277C
[22]	Bouzid H, Prosa M, Bolognesi M, et al. Impact of environmentally friendly processing solvents on the properties of blade-coated polymer solar cells. J Polym Sci Part A Polym Chem, 2019, 57, 487 doi: 10.1002/pola.29286
[23]	Zhang K, Chen Z, Armin A, et al. Efficient large area organic solar cells processed by blade-coating with single-component green solvent. Sol RRL, 2018, 2, 1700169 doi: 10.1002/solr.201700169
[24]	Pérez-Gutiérrez E, Lozano J, Gaspar-Tánori J, et al. Organic solar cells all made by blade and slot–die coating techniques. Sol Energy, 2017, 146, 79 doi: 10.1016/j.solener.2017.02.004
[25]	Ye L, Xiong Y, Yao H, et al. High performance organic solar cells processed by blade coating in air from a benign food additive solution. Chem Mater, 2016, 28, 7451 doi: 10.1021/acs.chemmater.6b03083
[26]	Sun C, Pan F, Bin H, et al. A low cost and high performance polymer donor material for polymer solar cells. Nat Commun, 2018, 9, 743 doi: 10.1038/s41467-018-03207-x
[27]	Duan C, Ding L. The new era for organic solar cells: polymer donors. Sci Bull, 2020, 65, 1422 doi: 10.1016/j.scib.2020.04.044
[28]	Yuan J, Zhang Y, Zhou L, et al. Single-junction organic solar cell with over 15% efficiency using fused-ring acceptor with electron-deficient core. Joule, 2019, 3, 1140 doi: 10.1016/j.joule.2019.01.004
[29]	Bergqvist J, Mauger S, Tvingstedt K, et al. In situ reflectance imaging of organic thin film formation from solution deposition. Sol Energy Mater Sol Cells, 2013, 114, 89 doi: 10.1016/j.solmat.2013.02.030
[30]	Xiong K, Hou L, Wu M, et al. From spin coating to doctor blading: a systematic study on the photovoltaic performance of an isoindigo-based polymer. Sol Energy Mater Sol Cells, 2015, 132, 252 doi: 10.1016/j.solmat.2014.08.039

Fig. 1. (a) Chemical structures of PHT4 and IT-4Cl. (b) Schematic of the blade-coating process with (below) and without (top) vacuum-drying. (c) Light reflectance vs drying time curves for PHT4:IT-4Cl films. (d) AFM images (size: 4 × 4 μm²). (e) Line-cut profiles of GIWAXS along the out-of-plane and in-plane directions. (f) J–V curves for devices made with and without vacuum-drying.

DownLoad: Full-Size Img PowerPoint

[1]	Duan C, Ding L. The new era for organic solar cells: non-fullerene small molecular acceptors. Sci Bull, 2020, 65, 1231 doi: 10.1016/j.scib.2020.04.030
[2]	Li W, Chen M, Cai J, et al. Molecular order control of non-fullerene acceptors for high-efficiency polymer solar cells. Joule, 2019, 3, 819 doi: 10.1016/j.joule.2018.11.023
[3]	Tong Y, Xiao Z, Du X, et al. Progress of the key materials for organic solar cells. Sci China Chem, 2020, 63, 758 doi: 10.1007/s11426-020-9726-0
[4]	Meng L, Zhang Y, Wan X, et al. Organic and solution-processed tandem solar cells with 17.3% efficiency. Science, 2018, 361, 1094 doi: 10.1126/science.aat2612
[5]	Li H, Xiao Z, Ding L, et al. Thermostable single-junction organic solar cells with a power conversion efficiency of 14.62%. Sci Bull, 2018, 63, 340 doi: 10.1016/j.scib.2018.02.015
[6]	An Q, Ma X, Gao J, et al. Solvent additive-free ternary polymer solar cells with 16.27% efficiency. Sci Bull, 2019, 64, 504 doi: 10.1016/j.scib.2019.03.024
[7]	Duan C, Ding L. The new era for organic solar cells: polymer acceptors. Sci Bull, 2020, 65, 1508 doi: 10.1016/j.scib.2020.05.023
[8]	Duan C, Ding L. The new era for organic solar cells: small molecular donors. Sci Bull, 2020, 65, 1597 doi: 10.1016/j.scib.2020.05.019
[9]	Zhang Y, Duan C, Ding L. Indoor organic photovoltaics. Sci Bull, 2020, 65, 2040 doi: 10.1016/j.scib.2020.08.030
[10]	Liu Q, Jiang Y, Jin K, et al. 18% efficiency organic solar cells. Sci Bull, 2020, 65, 272 doi: 10.1016/j.scib.2020.01.001
[11]	Jin K, Zuo X, Ding L. D18, an eximious solar polymer. J Semicond, 2021, 42, 010502 doi: 10.1088/1674-4926/42/1/010502
[12]	Qin J, Zhang L, Zuo C, et al. A chlorinated copolymer donor demonstrates a 18.13% power conversion efficiency. J Semicond, 2021, 42, 010501 doi: 10.1088/1674-4926/42/1/010501
[13]	Qin J, Zhang L, Xiao Z, et al. Over 16% efficiency from thick-film organic solar cells. Sci Bull, 2020, 65, 1979 doi: 10.1016/j.scib.2020.08.027
[14]	Lin Y, Cai C, Zhang Y, et al. Study of ITO-free roll-to-roll compatible polymer solar cells using the one-step doctor blading technique. J Mater Chem A, 2017, 5, 4093 doi: 10.1039/C6TA10018J
[15]	Lin Y, Jin Y, Dong S, et al. Printed nonfullerene organic solar cells with the highest efficiency of 9.5%. Adv Energy Mater, 2018, 8, 1701942 doi: 10.1002/aenm.201701942
[16]	Liu A, Zheng W, Yin X, et al. Manipulate micrometer surface and nanometer bulk phase separation structures in the active layer of organic solar cells via synergy of ultrasonic and high-pressure gas spraying. ACS Appl Mater Interfaces, 2019, 11, 10777 doi: 10.1021/acsami.8b22215
[17]	Zhao J, Li Y, Yang G, et al. Efficient organic solar cells processed from hydrocarbon solvents. Nat Energy, 2016, 1, 15027 doi: 10.1038/nenergy.2015.27
[18]	Liu F, Ferdous S, Schaible E, et al. Fast printing and in situ morphology observation of organic photovoltaics using slot-die coating. Adv Mater, 2015, 27, 886 doi: 10.1002/adma.201404040
[19]	Zhao W, Zhang Y, Zhang S, et al. Vacuum-assisted annealing method for high efficiency printable large-area polymer solar cell modules. J Mater Chem C, 2019, 7, 3206 doi: 10.1039/C8TC06513F
[20]	Zhao W, Zhang S, Zhang Y, et al. Environmentally friendly solvent-processed organic solar cells that are highly efficient and adaptable for the blade-coating method. Adv Mater, 2018, 30, 1704837 doi: 10.1002/adma.201704837
[21]	Ma Z, Zhao B, Gong Y, et al. Green-solvent-processable strategies for achieving large-scale manufacture of organic photovoltaics. J Mater Chem A, 2019, 7, 22826 doi: 10.1039/C9TA09277C
[22]	Bouzid H, Prosa M, Bolognesi M, et al. Impact of environmentally friendly processing solvents on the properties of blade-coated polymer solar cells. J Polym Sci Part A Polym Chem, 2019, 57, 487 doi: 10.1002/pola.29286
[23]	Zhang K, Chen Z, Armin A, et al. Efficient large area organic solar cells processed by blade-coating with single-component green solvent. Sol RRL, 2018, 2, 1700169 doi: 10.1002/solr.201700169
[24]	Pérez-Gutiérrez E, Lozano J, Gaspar-Tánori J, et al. Organic solar cells all made by blade and slot–die coating techniques. Sol Energy, 2017, 146, 79 doi: 10.1016/j.solener.2017.02.004
[25]	Ye L, Xiong Y, Yao H, et al. High performance organic solar cells processed by blade coating in air from a benign food additive solution. Chem Mater, 2016, 28, 7451 doi: 10.1021/acs.chemmater.6b03083
[26]	Sun C, Pan F, Bin H, et al. A low cost and high performance polymer donor material for polymer solar cells. Nat Commun, 2018, 9, 743 doi: 10.1038/s41467-018-03207-x
[27]	Duan C, Ding L. The new era for organic solar cells: polymer donors. Sci Bull, 2020, 65, 1422 doi: 10.1016/j.scib.2020.04.044
[28]	Yuan J, Zhang Y, Zhou L, et al. Single-junction organic solar cell with over 15% efficiency using fused-ring acceptor with electron-deficient core. Joule, 2019, 3, 1140 doi: 10.1016/j.joule.2019.01.004
[29]	Bergqvist J, Mauger S, Tvingstedt K, et al. In situ reflectance imaging of organic thin film formation from solution deposition. Sol Energy Mater Sol Cells, 2013, 114, 89 doi: 10.1016/j.solmat.2013.02.030
[30]	Xiong K, Hou L, Wu M, et al. From spin coating to doctor blading: a systematic study on the photovoltaic performance of an isoindigo-based polymer. Sol Energy Mater Sol Cells, 2015, 132, 252 doi: 10.1016/j.solmat.2014.08.039

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Received: 01 February 2021 Revised: Online: Accepted Manuscript: 02 February 2021Uncorrected proof: 03 February 2021Published: 10 March 2021

Article Navigation > Journal of Semiconductors > 2021 > 42(3): 030502

Wei Guan, Dong Yuan, Juntao Wu, Xiaobo Zhou, Hong Zhao, Fei Guo, Lianjie Zhang, Ke Zhou, Wei Ma, Wanzhu Cai, Junwu Chen, Liming Ding, Lintao Hou. Blade-coated organic solar cells from non-halogenated solvent offer 17% efficiency[J]. Journal of Semiconductors, 2021, 42(3): 030502. doi: 10.1088/1674-4926/42/3/030502 ****W Guan, D Yuan, J T Wu, X B Zhou, H Zhao, F Guo, L J Zhang, K Zhou, W Ma, W Z Cai, J W Chen, L M Ding, L T Hou, Blade-coated organic solar cells from non-halogenated solvent offer 17% efficiency[J]. J. Semicond., 2021, 42(3): 030502. doi: 10.1088/1674-4926/42/3/030502.

Citation:

W Guan, D Yuan, J T Wu, X B Zhou, H Zhao, F Guo, L J Zhang, K Zhou, W Ma, W Z Cai, J W Chen, L M Ding, L T Hou, Blade-coated organic solar cells from non-halogenated solvent offer 17% efficiency[J]. J. Semicond., 2021, 42(3): 030502. doi: 10.1088/1674-4926/42/3/030502.

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PDF( 8204 KB)

Blade-coated organic solar cells from non-halogenated solvent offer 17% efficiency

DOI: 10.1088/1674-4926/42/3/030502

1.
Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Siyuan Laboratory, Department of Physics, Jinan University, Guangzhou 510632, China
2.
Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
3.
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
4.
Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing 100190, China

More Information

Wei Guan：is an undergraduate student in the Department of Physics, Jinan University. He is working on the printing OPV project under the supervision of Professor Lintao Hou
Dong Yuan：received his BS degree from South China University of Technology in 2018. Now, he is a PhD candidate in Professor Junwu Chen’s group. His research focuses on the new materials for organic solar cells
Wanzhu Cai：is an associate professor in the Department of Physics, Jinan University, since 2017. She received a BS degree in Applied Physics (2007), a PhD degree in Material Physics and Chemistry (2012), both from South China University of Technology. She worked as a postdoc in Professor Fei Huang's group (SCUT) in 2012–2014, and Professor Olle Inganäs's group (LIU, Sweden) in 2014–2017. Her research focuses on materials development, polymer semiconductor processing, and optoelectronic device engineering
Junwu Chen：received his BS degree in 1989 and PhD degree in 1998. After two-year postdoctoral research with Professor Benzhong Tang at Hong Kong University of Science & Technology, he became an associate professor in 2002 and a full professor in 2007 at South China University of Technology. His research focuses on synthesis of organic functional materials and their optoelectronic applications
Liming Ding：got his PhD from University of Science and Technology of China (was a joint student at Changchun Institute of Applied Chemistry, CAS). He started his research on OSCs and PLEDs in Olle Inganäs Lab in 1998. Later on, he worked at National Center for Polymer Research, Wright-Patterson Air Force Base and Argonne National Lab (USA). He joined Konarka as a Senior Scientist in 2008. In 2010, he joined National Center for Nanoscience and Technology as a full professor. His research focuses on functional materials and devices
Lintao Hou：received his PhD degree in 2006 from South China University of Technology. Then he joined Jinan University as a teacher. In 2009–2011, he worked in Linköping University as a postdoc. In 2014, he became a full professor at Jinan University. His research focuses on printed optoelectronic devices and optical simulation
Corresponding author: wzhcai@jnu.edu.cn; psjwchen@scut.edu.cn; ding@nanoctr.cn; thlt@jnu.edu.cn
Received Date: 2021-02-01
Published Date: 2021-03-10

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References

[1]	Duan C, Ding L. The new era for organic solar cells: non-fullerene small molecular acceptors. Sci Bull, 2020, 65, 1231 doi: 10.1016/j.scib.2020.04.030
[2]	Li W, Chen M, Cai J, et al. Molecular order control of non-fullerene acceptors for high-efficiency polymer solar cells. Joule, 2019, 3, 819 doi: 10.1016/j.joule.2018.11.023
[3]	Tong Y, Xiao Z, Du X, et al. Progress of the key materials for organic solar cells. Sci China Chem, 2020, 63, 758 doi: 10.1007/s11426-020-9726-0
[4]	Meng L, Zhang Y, Wan X, et al. Organic and solution-processed tandem solar cells with 17.3% efficiency. Science, 2018, 361, 1094 doi: 10.1126/science.aat2612
[5]	Li H, Xiao Z, Ding L, et al. Thermostable single-junction organic solar cells with a power conversion efficiency of 14.62%. Sci Bull, 2018, 63, 340 doi: 10.1016/j.scib.2018.02.015
[6]	An Q, Ma X, Gao J, et al. Solvent additive-free ternary polymer solar cells with 16.27% efficiency. Sci Bull, 2019, 64, 504 doi: 10.1016/j.scib.2019.03.024
[7]	Duan C, Ding L. The new era for organic solar cells: polymer acceptors. Sci Bull, 2020, 65, 1508 doi: 10.1016/j.scib.2020.05.023
[8]	Duan C, Ding L. The new era for organic solar cells: small molecular donors. Sci Bull, 2020, 65, 1597 doi: 10.1016/j.scib.2020.05.019
[9]	Zhang Y, Duan C, Ding L. Indoor organic photovoltaics. Sci Bull, 2020, 65, 2040 doi: 10.1016/j.scib.2020.08.030
[10]	Liu Q, Jiang Y, Jin K, et al. 18% efficiency organic solar cells. Sci Bull, 2020, 65, 272 doi: 10.1016/j.scib.2020.01.001
[11]	Jin K, Zuo X, Ding L. D18, an eximious solar polymer. J Semicond, 2021, 42, 010502 doi: 10.1088/1674-4926/42/1/010502
[12]	Qin J, Zhang L, Zuo C, et al. A chlorinated copolymer donor demonstrates a 18.13% power conversion efficiency. J Semicond, 2021, 42, 010501 doi: 10.1088/1674-4926/42/1/010501
[13]	Qin J, Zhang L, Xiao Z, et al. Over 16% efficiency from thick-film organic solar cells. Sci Bull, 2020, 65, 1979 doi: 10.1016/j.scib.2020.08.027
[14]	Lin Y, Cai C, Zhang Y, et al. Study of ITO-free roll-to-roll compatible polymer solar cells using the one-step doctor blading technique. J Mater Chem A, 2017, 5, 4093 doi: 10.1039/C6TA10018J
[15]	Lin Y, Jin Y, Dong S, et al. Printed nonfullerene organic solar cells with the highest efficiency of 9.5%. Adv Energy Mater, 2018, 8, 1701942 doi: 10.1002/aenm.201701942
[16]	Liu A, Zheng W, Yin X, et al. Manipulate micrometer surface and nanometer bulk phase separation structures in the active layer of organic solar cells via synergy of ultrasonic and high-pressure gas spraying. ACS Appl Mater Interfaces, 2019, 11, 10777 doi: 10.1021/acsami.8b22215
[17]	Zhao J, Li Y, Yang G, et al. Efficient organic solar cells processed from hydrocarbon solvents. Nat Energy, 2016, 1, 15027 doi: 10.1038/nenergy.2015.27
[18]	Liu F, Ferdous S, Schaible E, et al. Fast printing and in situ morphology observation of organic photovoltaics using slot-die coating. Adv Mater, 2015, 27, 886 doi: 10.1002/adma.201404040
[19]	Zhao W, Zhang Y, Zhang S, et al. Vacuum-assisted annealing method for high efficiency printable large-area polymer solar cell modules. J Mater Chem C, 2019, 7, 3206 doi: 10.1039/C8TC06513F
[20]	Zhao W, Zhang S, Zhang Y, et al. Environmentally friendly solvent-processed organic solar cells that are highly efficient and adaptable for the blade-coating method. Adv Mater, 2018, 30, 1704837 doi: 10.1002/adma.201704837
[21]	Ma Z, Zhao B, Gong Y, et al. Green-solvent-processable strategies for achieving large-scale manufacture of organic photovoltaics. J Mater Chem A, 2019, 7, 22826 doi: 10.1039/C9TA09277C
[22]	Bouzid H, Prosa M, Bolognesi M, et al. Impact of environmentally friendly processing solvents on the properties of blade-coated polymer solar cells. J Polym Sci Part A Polym Chem, 2019, 57, 487 doi: 10.1002/pola.29286
[23]	Zhang K, Chen Z, Armin A, et al. Efficient large area organic solar cells processed by blade-coating with single-component green solvent. Sol RRL, 2018, 2, 1700169 doi: 10.1002/solr.201700169
[24]	Pérez-Gutiérrez E, Lozano J, Gaspar-Tánori J, et al. Organic solar cells all made by blade and slot–die coating techniques. Sol Energy, 2017, 146, 79 doi: 10.1016/j.solener.2017.02.004
[25]	Ye L, Xiong Y, Yao H, et al. High performance organic solar cells processed by blade coating in air from a benign food additive solution. Chem Mater, 2016, 28, 7451 doi: 10.1021/acs.chemmater.6b03083
[26]	Sun C, Pan F, Bin H, et al. A low cost and high performance polymer donor material for polymer solar cells. Nat Commun, 2018, 9, 743 doi: 10.1038/s41467-018-03207-x
[27]	Duan C, Ding L. The new era for organic solar cells: polymer donors. Sci Bull, 2020, 65, 1422 doi: 10.1016/j.scib.2020.04.044
[28]	Yuan J, Zhang Y, Zhou L, et al. Single-junction organic solar cell with over 15% efficiency using fused-ring acceptor with electron-deficient core. Joule, 2019, 3, 1140 doi: 10.1016/j.joule.2019.01.004
[29]	Bergqvist J, Mauger S, Tvingstedt K, et al. In situ reflectance imaging of organic thin film formation from solution deposition. Sol Energy Mater Sol Cells, 2013, 114, 89 doi: 10.1016/j.solmat.2013.02.030
[30]	Xiong K, Hou L, Wu M, et al. From spin coating to doctor blading: a systematic study on the photovoltaic performance of an isoindigo-based polymer. Sol Energy Mater Sol Cells, 2015, 132, 252 doi: 10.1016/j.solmat.2014.08.039

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