Polyamino acid-mediated crystallization and crystal stabilization in perovskite for efficient and stable photovoltaic devices

Chaoyang Wu; Chao Wang; Feifan Chen; Xinhe Dong; Jiajiu Ye; Haiying Zheng

doi:10.1088/1674-4926/25030040

J. Semicond. > In Press

ARTICLES

Polyamino acid-mediated crystallization and crystal stabilization in perovskite for efficient and stable photovoltaic devices

Chaoyang Wu¹, Chao Wang¹, Feifan Chen¹, Xinhe Dong¹, Jiajiu Ye³ and Haiying Zheng^{1, 2,}

+ Author Affiliations

Corresponding author: Haiying Zheng, hyzheng@djtu.edu.cn

DOI: 10.1088/1674-4926/25030040CSTR: 32376.14.1674-4926.25030040

Abstract: Although perovskite solar cells (PSCs) demonstrate outstanding power conversion efficiency (PCE), their practical applications are still limited by stability issues caused by various problems such as poor crystal quality triggered structural instability. Herein, to address the structural instability of perovskites, we introduced a polymer additive, poly-L-lysine hydrobromide (PLL), into the perovskite precursor to promote perovskite crystal growth, thereby constructing a stable crystal structure. The results show that the introduction of PLL modulates the colloidal aggregation state in the precursor solution, provides longer time for growth of perovskite and successfully realizes the formation of large-sized perovskite films with high crystallinity. More importantly, owing to its hydrophobic long-chain structure and the widespread distribution of C=O and NH on the chain, PLL firmly locks the perovskite crystals, enhancing their structural stability while blocking the intrusion of external factors such as water molecules, significantly enhances the overall stability of the device. The results show that the PLL-based PSC has negligible hysteresis and its PCE is improved from 22.20% to 23.66%. while the PLL-modified perovskite films and devices demonstrate excellent thermal and environmental stability. These findings highlight PLL as a promising additive for optimizing perovskite crystallization, offering guidance for fabricating efficient and stable photovoltaic devices.

Key words: perovskite solar cells, polyamino acid, additive, crystallization, stability

References

[1]	Han J, Park K, Tan S, et al. Perovskite solar cells. Nat Rev Method Prime, 2025, 5(1), 3 doi: 10.1038/s43586-024-00373-9
[2]	Lim J, Park N G, Seok S I, et al. All-perovskite tandem solar cells: From fundamentals to technological progress. Energy Environ Sci, 2024, 17(13), 4390 doi: 10.1039/D3EE03638C
[3]	Luo L, Zeng H P, Wang Z W, et al. Stabilization of 3D/2D perovskite heterostructures via inhibition of ion diffusion by cross-linked polymers for solar cells with improved performance. Nat Energy, 2023, 8(3), 294 doi: 10.1038/s41560-023-01205-y
[4]	Kojima A, Teshima K, Shirai Y, et al. Organometal halide perovskites as visible-light sensitizers for photovoltaic cells. J Am Chem Soc, 2009, 131(17), 6050 doi: 10.1021/ja809598r
[5]	National renewable energy laboratory (NREL).
[6]	Zhu P C, Chen C L, Dai J Q, et al. Toward the commercialization of perovskite solar modules. Adv Mater, 2024, 36(15), 2307357 doi: 10.1002/adma.202307357
[7]	Abzieher T, Moore D T, Roß M, et al. Vapor phase deposition of perovskite photovoltaics: Short track to commercialization? Energy Environ Sci, 2024, 17(5), 1645 doi: 10.1039/D3EE03273F
[8]	Qin X J, Zhao Z G, Wang Y D, et al. Recent progress in stability of perovskite solar cells. J Semicond, 2017, 38(1), 011002 doi: 10.1088/1674-4926/38/1/011002
[9]	Chen H Y, Chu L, Yan W S. Stability challenges in industrialization of perovskite photovoltaics: From atomic-scale view to module encapsulation. Adv Funct Mater, 2025, 35(2), 2412389 doi: 10.1002/adfm.202412389
[10]	Zhou Y Y, Zhao Y X. Chemical stability and instability of inorganic halide perovskites. Energy Environ Sci, 2019, 12(5), 1495 doi: 10.1039/C8EE03559H
[11]	Bryant D, Aristidou N, Pont S, et al. Light and oxygen induced degradation limits the operational stability of methylammonium lead triiodide perovskite solar cells. Energy Environ Sci, 2016, 9(5), 1655 doi: 10.1039/C6EE00409A
[12]	Park B W, Seok S I. Intrinsic instability of inorganic-organic hybrid halide perovskite materials. Adv Mater, 2019, 31(20), 1805337 doi: 10.1002/adma.201805337
[13]	Jeong K, Lim E, Yang J, et al. Trapped charges: A fundamental cause for light-induced instability in perovskites. ACS Energy Lett, 2024, 9(11), 5670 doi: 10.1021/acsenergylett.4c02438
[14]	Choi J I J, Ono L K, Cho H Y, et al. Pathways of water-induced lead-halide perovskite surface degradation: Insights from in situ atomic-scale analysis. ACS Nano, 2023, 17(24), 25679 doi: 10.1021/acsnano.3c10611
[15]	Yang M J, Zhang T Y, Schulz P, et al. Facile fabrication of large-grain CH₃NH₃PbI_3-xBr_x films for high-efficiency solar cells via CH₃NH₃Br-selective Ostwald ripening. Nat Commun, 2016, 7(1), 12305 doi: 10.1038/ncomms12305
[16]	Jung M, Ji S G, Kim G, et al. Perovskite precursor solution chemistry: From fundamentals to photovoltaic applications. Chem Soc Rev, 2019, 48(7), 2011 doi: 10.1039/C8CS00656C
[17]	Zhang K Y, Deng Y X, Shi X R, et al. Interface chelation induced by pyridine-based polymer for efficient and durable air-processed perovskite solar cells. Angew Chem Int Edit, 2022, 61(4), e202112673 doi: 10.1002/anie.202112673
[18]	Chen X, Cai W L, Niu T Q, et al. Crystallization control via ligand-perovskite coordination for high-performance flexible perovskite solar cells. Energy Environ Sci, 2024, 17(17), 6256 doi: 10.1039/D4EE02279C
[19]	Xu W X, Zhao G Q, Li M B, et al. Tailored polymeric hole-transporting materials inducing high-quality crystallization of perovskite for efficient inverted photovoltaic devices. Small, 2022, 18(21), 2106632 doi: 10.1002/smll.202106632
[20]	Li Y, Zheng Y, Song X F, et al. Moisture-induced high-quality perovskite film in air for efficient solar cells. Sol RRL, 2024, 8(14), 2400322 doi: 10.1002/solr.202400322
[21]	Wang S Q, Yang T H, Yang Y G, et al. In situ self-elimination of defects via controlled perovskite crystallization dynamics for high-performance solar cells. Adv Mater, 2023, 35(42), 2305314 doi: 10.1002/adma.202305314
[22]	Xin Z, Ding Y, Zhao Y Y, et al. Colloidal stabilizer-mediated crystal growth regulation and defect healing for high-quality perovskite solar cells. Adv Energy Mater, 2025, 15(6), 2403018 doi: 10.1002/aenm.202403018
[23]	Liu Y, Lang K, Han H F, et al. Crystallization management of CsPbI₂Br perovskites by PbAc₂-incorporated twice spin-coating process for efficient and stable CsPbI₂Br perovskite solar cells. J Energy Chem, 2024, 97, 419 doi: 10.1016/j.jechem.2024.05.034
[24]	Shen Y X, Xu G Y, Li J J, et al. Functional ionic liquid polymer stabilizer for high-performance perovskite photovoltaics. Angew Chem Int Edit, 2023, 62(16), e202300690 doi: 10.1002/anie.202300690
[25]	Lin S Y, Wu S Y, Guo D E, et al. Improved crystallization of lead halide perovskite in two-step growth method by polymer-assisted "slow-release effect". Small Methods, 2023, 7(4), 2201663 doi: 10.1002/smtd.202201663
[26]	Choubey A, Perumal N, Muthu S P, et al. Ambient-air crystallization of CsPbIBr₂ films with polymer towards stable and efficient carbon-based perovskite solar cells. Opt Mater, 2024, 147, 114672 doi: 10.1016/j.optmat.2023.114672
[27]	Yi F X, Guo Q Y, Zheng D D, et al. Multifunctional polymer capping frameworks enable high-efficiency and stable all-inorganic perovskite solar cells. ACS Appl Energy Mater, 2022, 5(5), 6432 doi: 10.1021/acsaem.2c00923
[28]	Xu Y B, Wang S R, Liu H L, et al. Microencapsulated perovskite crystals via in situ permeation growth from polymer microencapsulation-expansion-contraction strategy: Advancing a record long-term stability beyond 10 000 h for perovskite solar cells. Adv Mater, 2024, 36(18), 2313080 doi: 10.1002/adma.202313080
[29]	Zheng H Y, Liu G Z, Wu W W, et al. Highly efficient and stable perovskite solar cells with strong hydrophobic barrier via introducing poly(vinylidene fluoride) additive. J Energy Chem, 2021, 57, 593 doi: 10.1016/j.jechem.2020.09.026
[30]	Zheng Z W, Xia M H, Chen X Y, et al. Enhancing the performance of fa-based printable mesoscopic perovskite solar cells via the polymer additive. Adv Energy Mater, 2023, 13(23), 2204335 doi: 10.1002/aenm.202204335
[31]	Zhang H Z, Yang Q, Jiang Z J, et al. Controlling crystallization dynamics of the perovskite by restricted assembly strategy enables high-performance solar cells. Adv Funct Mater, 2025, 2421910 doi: 10.1002/adfm.202421910
[32]	Jiang X Q, Zhang B Q, Yang G Y, et al. Molecular dipole engineering of carbonyl additives for efficient and stable perovskite solar cells. Angew Chem Int Edit, 2023, 62(22), e202302462 doi: 10.1002/anie.202302462
[33]	Hu P, Zhou W B, Chen J L, et al. Multidentate anchoring strategy for synergistically modulating crystallization and stability towards efficient perovskite solar cells. Chem Eng J, 2024, 480, 148249 doi: 10.1016/j.cej.2023.148249
[34]	Pandey A, Dalal S, Dutta S, et al. Structural characterization of polycrystalline thin films by X-ray diffraction techniques. J Mater Sci-Mater El, 2021, 32(2), 1341 doi: 10.1007/s10854-020-04998-w
[35]	Zhang H K, Ren Z W, Liu K, et al. Controllable heterogenous seeding-induced crystallization for high-efficiency FAPbI₃-based perovskite solar cells over 24%. Adv Mater, 2022, 34(36), 2204366. doi: 10.1002/adma.202204366
[36]	Zheng H L, Liu D T, Wang Y F, et al. Synergistic effect of additives on 2D perovskite film towards efficient and stable solar cell. Chem Eng J, 2020, 389, 124266 doi: 10.1016/j.cej.2020.124266
[37]	Iftiquar S M, Yi J. Impact of grain boundary defect on performance of perovskite solar cell. Mat Sci Semicon Proc, 2018, 79, 46 doi: 10.1016/j.mssp.2018.01.022
[38]	Fang Z M, Sun J, Liu S Z, et al. Defects in perovskite crystals. J Semicond, 2023, 44(8), 080201 doi: 10.1088/1674-4926/44/8/080201

Fig. 1. (Color online) (a) Chemical structure of PLL. (b) FTIR spectra of the PbI₂, PLL, and PLL + PbI₂. (c) Schematic of the interaction force between PLL and perovskite. (d) Schematic diagram of the mechanism of PLL inhibition of ion migration.

DownLoad: Full-Size Img PowerPoint

Fig. 2. (Color online) (a) X-ray diffraction (XRD) patterns, (b) 110 peak intensities and full width at half maxima (FWHM) values, (c) UV−vis absorption spectra and (d) PL spectra of the pristine and PLL perovskite films.

DownLoad: Full-Size Img PowerPoint

Fig. 3. (Color online) (a) and (d) Colloidal particle size distribution of perovskite precursors measured by DLS. (b), (e) Top-view SEM images and (c), (f) grain size statistics of the pristine and PLL perovskite films.

DownLoad: Full-Size Img PowerPoint

Fig. 4. (Color online) (a) J−V curves of the PLL perovskite devices with different concentrations (0.01, 0.03, and 0.05 mg∙mL⁻¹). (b) J−V curves of pristine and PLL perovskite devices and schematic of the corresponding PSCs device structures. (c) IPCE spectra and (d) Nyquist plots at V = −1.0 V of the pristine and PLL perovskite devices.

DownLoad: Full-Size Img PowerPoint

Fig. 5. (Color online) (a) PCE distribution, (b) V_oc distribution, (c) J_sc distribution and (d) FF distribution of the pristine and PLL perovskite devices.

DownLoad: Full-Size Img PowerPoint

Fig. 6. (Color online) (a) Water contact angles of the pristine and PLL perovskite films. Normalized (b) PCE, (c) J_sc, (d) V_oc, and (e) FF variation curves of the unsealed pristine and PLL perovskite devices aged under 45 ± 5% RH.

DownLoad: Full-Size Img PowerPoint

Fig. 7. (Color online) UV−vis absorption spectra aging at 85 °C of the (a) pristine and (b) PLL perovskite films. (c) Images of the pristine and PLL perovskite films before and after aging at 85 °C. Normalized (d) PCE, (e) J_sc, (f) V_oc and (g) FF variation curves of the unsealed pristine and PLL PSCs aging at 85 °C.

DownLoad: Full-Size Img PowerPoint

Table 1. PV parameters of the pristine and PLL PSCs under reverse and forward scan directions with a scan speed of 0.05 V∙s⁻¹.

Device	Scan direction	J_sc (mA∙cm⁻²)	V_oc (V)	FF (%)	PCE (%)	Hysteresis factor (%)
Pristine	Reverse	24.31	1.167	78.20	22.20	2.65
Pristine	Forward	23.93	1.161	77.80	21.61	2.65
PLL	Reverse	24.71	1.183	80.94	23.66	0.70
PLL	Forward	24.79	1.179	80.34	23.49	0.70

DownLoad: CSV

[1]	Han J, Park K, Tan S, et al. Perovskite solar cells. Nat Rev Method Prime, 2025, 5(1), 3 doi: 10.1038/s43586-024-00373-9
[2]	Lim J, Park N G, Seok S I, et al. All-perovskite tandem solar cells: From fundamentals to technological progress. Energy Environ Sci, 2024, 17(13), 4390 doi: 10.1039/D3EE03638C
[3]	Luo L, Zeng H P, Wang Z W, et al. Stabilization of 3D/2D perovskite heterostructures via inhibition of ion diffusion by cross-linked polymers for solar cells with improved performance. Nat Energy, 2023, 8(3), 294 doi: 10.1038/s41560-023-01205-y
[4]	Kojima A, Teshima K, Shirai Y, et al. Organometal halide perovskites as visible-light sensitizers for photovoltaic cells. J Am Chem Soc, 2009, 131(17), 6050 doi: 10.1021/ja809598r
[5]	National renewable energy laboratory (NREL).
[6]	Zhu P C, Chen C L, Dai J Q, et al. Toward the commercialization of perovskite solar modules. Adv Mater, 2024, 36(15), 2307357 doi: 10.1002/adma.202307357
[7]	Abzieher T, Moore D T, Roß M, et al. Vapor phase deposition of perovskite photovoltaics: Short track to commercialization? Energy Environ Sci, 2024, 17(5), 1645 doi: 10.1039/D3EE03273F
[8]	Qin X J, Zhao Z G, Wang Y D, et al. Recent progress in stability of perovskite solar cells. J Semicond, 2017, 38(1), 011002 doi: 10.1088/1674-4926/38/1/011002
[9]	Chen H Y, Chu L, Yan W S. Stability challenges in industrialization of perovskite photovoltaics: From atomic-scale view to module encapsulation. Adv Funct Mater, 2025, 35(2), 2412389 doi: 10.1002/adfm.202412389
[10]	Zhou Y Y, Zhao Y X. Chemical stability and instability of inorganic halide perovskites. Energy Environ Sci, 2019, 12(5), 1495 doi: 10.1039/C8EE03559H
[11]	Bryant D, Aristidou N, Pont S, et al. Light and oxygen induced degradation limits the operational stability of methylammonium lead triiodide perovskite solar cells. Energy Environ Sci, 2016, 9(5), 1655 doi: 10.1039/C6EE00409A
[12]	Park B W, Seok S I. Intrinsic instability of inorganic-organic hybrid halide perovskite materials. Adv Mater, 2019, 31(20), 1805337 doi: 10.1002/adma.201805337
[13]	Jeong K, Lim E, Yang J, et al. Trapped charges: A fundamental cause for light-induced instability in perovskites. ACS Energy Lett, 2024, 9(11), 5670 doi: 10.1021/acsenergylett.4c02438
[14]	Choi J I J, Ono L K, Cho H Y, et al. Pathways of water-induced lead-halide perovskite surface degradation: Insights from in situ atomic-scale analysis. ACS Nano, 2023, 17(24), 25679 doi: 10.1021/acsnano.3c10611
[15]	Yang M J, Zhang T Y, Schulz P, et al. Facile fabrication of large-grain CH₃NH₃PbI_3-xBr_x films for high-efficiency solar cells via CH₃NH₃Br-selective Ostwald ripening. Nat Commun, 2016, 7(1), 12305 doi: 10.1038/ncomms12305
[16]	Jung M, Ji S G, Kim G, et al. Perovskite precursor solution chemistry: From fundamentals to photovoltaic applications. Chem Soc Rev, 2019, 48(7), 2011 doi: 10.1039/C8CS00656C
[17]	Zhang K Y, Deng Y X, Shi X R, et al. Interface chelation induced by pyridine-based polymer for efficient and durable air-processed perovskite solar cells. Angew Chem Int Edit, 2022, 61(4), e202112673 doi: 10.1002/anie.202112673
[18]	Chen X, Cai W L, Niu T Q, et al. Crystallization control via ligand-perovskite coordination for high-performance flexible perovskite solar cells. Energy Environ Sci, 2024, 17(17), 6256 doi: 10.1039/D4EE02279C
[19]	Xu W X, Zhao G Q, Li M B, et al. Tailored polymeric hole-transporting materials inducing high-quality crystallization of perovskite for efficient inverted photovoltaic devices. Small, 2022, 18(21), 2106632 doi: 10.1002/smll.202106632
[20]	Li Y, Zheng Y, Song X F, et al. Moisture-induced high-quality perovskite film in air for efficient solar cells. Sol RRL, 2024, 8(14), 2400322 doi: 10.1002/solr.202400322
[21]	Wang S Q, Yang T H, Yang Y G, et al. In situ self-elimination of defects via controlled perovskite crystallization dynamics for high-performance solar cells. Adv Mater, 2023, 35(42), 2305314 doi: 10.1002/adma.202305314
[22]	Xin Z, Ding Y, Zhao Y Y, et al. Colloidal stabilizer-mediated crystal growth regulation and defect healing for high-quality perovskite solar cells. Adv Energy Mater, 2025, 15(6), 2403018 doi: 10.1002/aenm.202403018
[23]	Liu Y, Lang K, Han H F, et al. Crystallization management of CsPbI₂Br perovskites by PbAc₂-incorporated twice spin-coating process for efficient and stable CsPbI₂Br perovskite solar cells. J Energy Chem, 2024, 97, 419 doi: 10.1016/j.jechem.2024.05.034
[24]	Shen Y X, Xu G Y, Li J J, et al. Functional ionic liquid polymer stabilizer for high-performance perovskite photovoltaics. Angew Chem Int Edit, 2023, 62(16), e202300690 doi: 10.1002/anie.202300690
[25]	Lin S Y, Wu S Y, Guo D E, et al. Improved crystallization of lead halide perovskite in two-step growth method by polymer-assisted "slow-release effect". Small Methods, 2023, 7(4), 2201663 doi: 10.1002/smtd.202201663
[26]	Choubey A, Perumal N, Muthu S P, et al. Ambient-air crystallization of CsPbIBr₂ films with polymer towards stable and efficient carbon-based perovskite solar cells. Opt Mater, 2024, 147, 114672 doi: 10.1016/j.optmat.2023.114672
[27]	Yi F X, Guo Q Y, Zheng D D, et al. Multifunctional polymer capping frameworks enable high-efficiency and stable all-inorganic perovskite solar cells. ACS Appl Energy Mater, 2022, 5(5), 6432 doi: 10.1021/acsaem.2c00923
[28]	Xu Y B, Wang S R, Liu H L, et al. Microencapsulated perovskite crystals via in situ permeation growth from polymer microencapsulation-expansion-contraction strategy: Advancing a record long-term stability beyond 10 000 h for perovskite solar cells. Adv Mater, 2024, 36(18), 2313080 doi: 10.1002/adma.202313080
[29]	Zheng H Y, Liu G Z, Wu W W, et al. Highly efficient and stable perovskite solar cells with strong hydrophobic barrier via introducing poly(vinylidene fluoride) additive. J Energy Chem, 2021, 57, 593 doi: 10.1016/j.jechem.2020.09.026
[30]	Zheng Z W, Xia M H, Chen X Y, et al. Enhancing the performance of fa-based printable mesoscopic perovskite solar cells via the polymer additive. Adv Energy Mater, 2023, 13(23), 2204335 doi: 10.1002/aenm.202204335
[31]	Zhang H Z, Yang Q, Jiang Z J, et al. Controlling crystallization dynamics of the perovskite by restricted assembly strategy enables high-performance solar cells. Adv Funct Mater, 2025, 2421910 doi: 10.1002/adfm.202421910
[32]	Jiang X Q, Zhang B Q, Yang G Y, et al. Molecular dipole engineering of carbonyl additives for efficient and stable perovskite solar cells. Angew Chem Int Edit, 2023, 62(22), e202302462 doi: 10.1002/anie.202302462
[33]	Hu P, Zhou W B, Chen J L, et al. Multidentate anchoring strategy for synergistically modulating crystallization and stability towards efficient perovskite solar cells. Chem Eng J, 2024, 480, 148249 doi: 10.1016/j.cej.2023.148249
[34]	Pandey A, Dalal S, Dutta S, et al. Structural characterization of polycrystalline thin films by X-ray diffraction techniques. J Mater Sci-Mater El, 2021, 32(2), 1341 doi: 10.1007/s10854-020-04998-w
[35]	Zhang H K, Ren Z W, Liu K, et al. Controllable heterogenous seeding-induced crystallization for high-efficiency FAPbI₃-based perovskite solar cells over 24%. Adv Mater, 2022, 34(36), 2204366. doi: 10.1002/adma.202204366
[36]	Zheng H L, Liu D T, Wang Y F, et al. Synergistic effect of additives on 2D perovskite film towards efficient and stable solar cell. Chem Eng J, 2020, 389, 124266 doi: 10.1016/j.cej.2020.124266
[37]	Iftiquar S M, Yi J. Impact of grain boundary defect on performance of perovskite solar cell. Mat Sci Semicon Proc, 2018, 79, 46 doi: 10.1016/j.mssp.2018.01.022
[38]	Fang Z M, Sun J, Liu S Z, et al. Defects in perovskite crystals. J Semicond, 2023, 44(8), 080201 doi: 10.1088/1674-4926/44/8/080201

Search

GET CITATION

shu

Export: BibTex EndNote

Article Metrics

Article views: 16 Times PDF downloads: 1 Times Cited by: 0 Times

History

Received: 28 March 2025 Revised: 24 April 2025 Online: Uncorrected proof: 07 May 2025

Article Navigation > Journal of Semiconductors > 2025 > Uncorrected proof

Chaoyang Wu, Chao Wang, Feifan Chen, Xinhe Dong, Jiajiu Ye, Haiying Zheng. Polyamino acid-mediated crystallization and crystal stabilization in perovskite for efficient and stable photovoltaic devices[J]. Journal of Semiconductors, 2025, In Press. doi: 10.1088/1674-4926/25030040 ****C Y Wu, C Wang, F F Chen, X H Dong, J J Ye, and H Y Zheng, Polyamino acid-mediated crystallization and crystal stabilization in perovskite for efficient and stable photovoltaic devices[J]. J. Semicond., 2025, 46(5), 052804 doi: 10.1088/1674-4926/25030040

Citation:

C Y Wu, C Wang, F F Chen, X H Dong, J J Ye, and H Y Zheng, Polyamino acid-mediated crystallization and crystal stabilization in perovskite for efficient and stable photovoltaic devices[J]. J. Semicond., 2025, 46(5), 052804 doi: 10.1088/1674-4926/25030040

Citation:

PDF( 27412 KB)

Polyamino acid-mediated crystallization and crystal stabilization in perovskite for efficient and stable photovoltaic devices

DOI: 10.1088/1674-4926/25030040

CSTR: 32376.14.1674-4926.25030040

1.
Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
2.
School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China
3.
Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China

More Information

Chaoyang Wu received his Bachelor's degree from Anhui Jianzhu university in 2023. He is currently studying for his master’s degree under the guidance of Dr Haiying Zheng in the Institutes of Physical Science and Information Technology, Anhui University. His research interests include the preparation of highly efficient and stable 2D/3D perovskite solar cells
Haiying Zheng got her PhD degree in materials physics and chemistry from the University of Science and Technology of China in 2019. She then worked in the Institute of Physical Science and Information Technology, Anhui University from 2019 to 2024 and is now an assistant researcher in the School of Materials Science and Engineering, Dalian Jiaotong University. Her present interests include new-type solar cells, especially two dimensional and mixed-dimensional perovskite solar cells
Corresponding author: hyzheng@djtu.edu.cn
Received Date: 2025-03-28
Revised Date: 2025-04-24

Available Online: 2025-05-07

Abstract

Abstract

Although perovskite solar cells (PSCs) demonstrate outstanding power conversion efficiency (PCE), their practical applications are still limited by stability issues caused by various problems such as poor crystal quality triggered structural instability. Herein, to address the structural instability of perovskites, we introduced a polymer additive, poly-L-lysine hydrobromide (PLL), into the perovskite precursor to promote perovskite crystal growth, thereby constructing a stable crystal structure. The results show that the introduction of PLL modulates the colloidal aggregation state in the precursor solution, provides longer time for growth of perovskite and successfully realizes the formation of large-sized perovskite films with high crystallinity. More importantly, owing to its hydrophobic long-chain structure and the widespread distribution of C=O and NH on the chain, PLL firmly locks the perovskite crystals, enhancing their structural stability while blocking the intrusion of external factors such as water molecules, significantly enhances the overall stability of the device. The results show that the PLL-based PSC has negligible hysteresis and its PCE is improved from 22.20% to 23.66%. while the PLL-modified perovskite films and devices demonstrate excellent thermal and environmental stability. These findings highlight PLL as a promising additive for optimizing perovskite crystallization, offering guidance for fabricating efficient and stable photovoltaic devices.
- perovskite solar cells,
- polyamino acid,
- additive,
- crystallization,
- stability

FullText(HTML)

References(38)