J. Semicond. > 2021, Volume 42 > Issue 5 > 050202

RESEARCH HIGHLIGHTS

Fiber-like solar cells

Xing Fan1, Dechun Zou2, and Liming Ding3,

+ Author Affiliations

 Corresponding author: Dechun Zou, dczou@pku.edu.cn; Liming Ding, ding@nanoctr.cn

DOI: 10.1088/1674-4926/42/5/050202

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The human habit of wearing fiber materials and interwoven fabric can be dated back to the prehistoric time. In recent years, efforts have been devoted to make flexible energy devices, e.g., solar cells, into fiber shape, further expanding the concept of fiber from cloth materials to modern on-body electronic devices. The evolution of device shape has not only made changes to the sandwich-like device structure, but also provided more alternatives to classical electrode materials like transparent conductive oxide. In 2008, a flexible dye-sensitized solar cell (DSSC) was invented by Zou et al.[1] via twisting two electrodes into one fiber-like device, as a breakthrough to the coaxial-type or planar-type device structure. The entire cell was a fine wire with diameters of ~200 μm. The working electrode was stainless steel fiber coated with a layer of dye-sensitized TiO2, and the counter electrode was Pt wire. Positive charges from the photoanode can be transferred to counter electrode by either liquid electrolyte or all-solid hole-transport materials[1-3]. Thanks to the twisting structure, solar light can easily reach the working electrode from almost every direction, even though both electrodes are opaque. It completely got rid of transparent conductive oxide material for both electrodes. This work is a vital start, which enables weaving solar cells into any shapes, such as rope, bag, or clothing etc. After that, fiber-like solar cells with a twist structure have attracted increasing attentions. To realize high efficiency, low cost and wear comfort, a lot of works have been reported on the development of photoanode, counter electrode and photoactive materials (Fig. 1).

Figure  1.  (Color online) Fiber-like solar cells and applications. Reproduced with permission[1], Copyright 2008, WILEY-VCH. Reproduced with permission[7], Copyright 2012, Royal Society of Chemistry. Reproduced with permission[13], Copyright 2019, WILEY-VCH. Reproduced with permission[15], Copyright 2018, Elsevier. Reproduced with permission[16], Copyright 2012, WILEY-VCH. Reproduced with permission[17], Copyright 2013, Royal Society of Chemistry. Reproduced with permission[19], Copyright 2020, Elsevier.

For the photoanode, Ti wire was first selected as an alternative for the stainless-steel wire by Zou et al.[4]. Electrochemical anodization was used to anodize a Ti wire into a TiO2 nanotube (TNT) array anode for semi-solid and all-solid fiber-like DSSCs. The power conversion efficiency (PCE) of the semi-solid device increased from <1% to >1.5%. After years efforts, the PCE for Ti-based fiber-like DSSCs reached >10%[5], and the TNT photoanode currently becomes a standard anode. To reduce the weight of metal wire, various metals, e.g. Mn, Ni and Zn, were deposited onto polymer wires for photoanode assembling. Among them, a low-cost and lightweight PBT\Cu\Mn\ZnO photoanode was developed by Fan et al.[6], and exhibited special suitability for CuI-type all-solid DSSCs. Furthermore, all-carbon electrode-based fiber-like DSSCs were reported in 2012[7]. The devices had a carbon fiber/TiO2 photoanode and gave a 1.9% PCE, with significantly reduced weight and cost. In 2014, vertically aligned TiO2 nanowire arrays and hierarchical TiO2 nanoparticle were successively deposited onto carbon fibers to form the anode[8]. The devices offered an apparent PCE of 4.18% due to 3D light-harvesting.

For the counter electrode, carbon-based materials were found very promising as a low-cost but effective alternative for the expensive Pt wire. In 2011, Zou et al. reported a transparent conductive oxide-less DSSC with Pt-plated commercial carbon fiber as the counter electrode, which gave a 5.8% PCE[9]. In 2012, a low-cost all-carbon counter electrode was further developed, i.e., a bundle of carbon fibers coated with commercial carbon ink[7]. The flexible conductive thread-like counter electrode was made by dip-coating PEDOT:PSS onto insulating commercial threads. PEDOT:PSS improved the conductivity and catalytic performance of the threads, and the fiber-like DSSCs gave a 4.8% PCE[10].

For the photoactive materials, semiconductive oxides of TiO2, ZnO and SnO2 were explored as the photoactive materials on the photoanode of DSSCs[11, 12]. Scientists also tried to apply perovskite materials into fiber-like solar cells. In 2019, Zou et al. reported fiber-like perovskite solar cells with a 10.79% PCE[13], which is the record PCE for fiber-like solar cells. To prepare a high-quality perovskite layer onto the fiber substrate, the vapor-assisted deposition method was performed.

Besides materials exploration, micro optical structures, like micro-reflectors, wave-guide concentrators and hierarchical light harvesters, were also designed and integrated into fiber-like solar cells, which can effectively capture diffuse light from all directions and significantly enhance the maximum power output[14, 15]. In addition, to provide an uninterrupted wearable power supply based on fiber-like solar cells, hybrid devices of energy harvest and energy storage were explored to realize a stable power output. In 2012, Zou et al. reported a fiber-like supercapacitor[16], and the low-cost commercial pen ink was directly used as the electrochemical material. The supercapacitor was then integrated with the fiber-like DSSC to form a new power fiber[17] with a ~2.1% PCE. Compared with traditional integrated power systems, the power fiber provided a lightweight, flexible, and inexpensive alternative for integrating with cloth. Similar integration strategy was applied in batteries to produce a sustainable power fiber[18].

Though there are challenges in PCE, lifetime, scalable fabrication and wearing comfort, fiber-like solar cells hold the advantages for being integrated with fiber-like energy storage devices and further being woven into clothes[19]. We believe that fiber-like solar cells will find applications in AI in the near future.

This work was supported by the Fok Ying-Tong Education Foundation for Young Teachers in the Higher Education Institutions of China (161067). L. Ding thanks the National Key Research and Development Program of China (2017YFA0206600) and the National Natural Science Foundation of China (51773045, 21772030, 51922032, 21961160720) for financial support.



[1]
Fan X, Chu Z, Wang F, et al. Wire-shaped flexible dye-sensitized solar cells. Adv Mater, 2008, 20, 592 doi: 10.1002/adma.200701249
[2]
Fan X, Chu Z, Chen L, et al. Fibrous flexible solid-type dye-sensitized solar cells without transparent conducting oxide. Appl Phys Lett, 2008, 92, 113510 doi: 10.1063/1.2891051
[3]
Zou D, Wang D, Chu Z, et al. Fiber-shaped flexible solar cells. Coordin Chem Rev, 2010, 254, 1169 doi: 10.1016/j.ccr.2010.02.012
[4]
Yu J, Wang D, Huang Y, et al. A cylindrical core-shell-like TiO2 nanotube array anode for flexible fiber-type dye-sensitized solar cells. Nanoscale Res Lett, 2011, 6, 94 doi: 10.1186/1556-276X-6-94
[5]
Wang D, Hou S, Wu H, et al. Fiber-shaped all-solid state dye sensitized solar cell with remarkably enhanced performance via substrate surface engineering and TiO2 film modification. J Mater Chem, 2011, 21, 6383 doi: 10.1039/c1jm00016k
[6]
Fan X, Zhang X, Zhang N, et al. Wet-process fabrication of low-cost all-solid wire-shaped solar cells on manganese-plated electrodes. Electrochim Acta, 2015, 161, 358 doi: 10.1016/j.electacta.2015.02.092
[7]
Cai X, Hou S, Wu H, et al. All-carbon electrode-based fiber-shaped dye-sensitized solar cells. Phys Chem Chem Phys, 2012, 14, 125 doi: 10.1039/C1CP22613D
[8]
Cai X, Wu H, Hou S, et al. Dye-sensitized solar cells with vertically aligned TiO2 nanowire arrays grown on carbon fibers. ChemSusChem, 2014, 7, 474 doi: 10.1002/cssc.201301020
[9]
Fu Y, Hou S, Cai X, et al. Transparent conductive oxide-less, flexible, and highly efficient dye-sensitized solar cells with commercialized carbon fiber as the counter electrode. J Mater Chem, 2011, 21, 13776 doi: 10.1039/c1jm12056e
[10]
Hou S, Lv Z, Wu H, et al. Flexible conductive threads for wearable dye-sensitized solar cells. J Mater Chem, 2012, 22, 6549 doi: 10.1039/c2jm16773e
[11]
Peng M, Cai X, Fu Y, et al. Facial synthesis of SnO2 nanoparticle film for efficient fiber-shaped dye-sensitized solar cells. J Power Sources, 2014, 247, 249 doi: 10.1016/j.jpowsour.2013.08.075
[12]
Wang W, Zhao Q, Li H, et al. Transparent, double-sided, ITO-free, flexible dye-sensitized solar sells based on metal wire/ZnO nanowire arrays. Adv Funct Mater, 2012, 22, 2775 doi: 10.1002/adfm.201200168
[13]
Dong B, Hu J, Xiao X, et al. High-efficiency fiber-shaped perovskite solar cell by vapor-assisted deposition with a record efficiency of 10.79%. Adv Mater Technol, 2019, 4, 1900131 doi: 10.1002/admt.201900131
[14]
Fu Y, Lv Z, Hou S, et al. Conjunction of fiber solar cells with groovy micro-reflectors as highly efficient energy harvesters. Energy Environ Sci, 2011, 4, 3379 doi: 10.1039/c1ee01427g
[15]
Liu G, Wang M, Wang H, et al. Hierarchically structured photoanode with enhanced charge collection and light harvesting abilities for fiber-shaped dye-sensitized solar cells. Nano Energy, 2018, 49, 95 doi: 10.1016/j.nanoen.2018.04.037
[16]
Fu Y, Cai X, Wu H, et al. Fiber supercapacitors utilizing pen ink for flexible/wearable energy storage. Adv Mater, 2012, 24, 5713 doi: 10.1002/adma.201202930
[17]
Fu Y, Wu H, Ye S, et al. Integrated power fiber for energy conversion and storage. Energy Environ Sci, 2013, 6, 805 doi: 10.1039/c3ee23970e
[18]
Yu X, Fu Y, Cai X, et al. Flexible fiber-type zinc –carbon battery based on carbon fiber electrodes. Nano Energy, 2013, 2, 1242 doi: 10.1016/j.nanoen.2013.06.002
[19]
Zhang N, Huang F, Zhao S, et al. Photo-rechargeable fabrics as sustainable and robust power sources for wearable bioelectronics. Matter, 2020, 2, 1260 doi: 10.1016/j.matt.2020.01.022
Fig. 1.  (Color online) Fiber-like solar cells and applications. Reproduced with permission[1], Copyright 2008, WILEY-VCH. Reproduced with permission[7], Copyright 2012, Royal Society of Chemistry. Reproduced with permission[13], Copyright 2019, WILEY-VCH. Reproduced with permission[15], Copyright 2018, Elsevier. Reproduced with permission[16], Copyright 2012, WILEY-VCH. Reproduced with permission[17], Copyright 2013, Royal Society of Chemistry. Reproduced with permission[19], Copyright 2020, Elsevier.

[1]
Fan X, Chu Z, Wang F, et al. Wire-shaped flexible dye-sensitized solar cells. Adv Mater, 2008, 20, 592 doi: 10.1002/adma.200701249
[2]
Fan X, Chu Z, Chen L, et al. Fibrous flexible solid-type dye-sensitized solar cells without transparent conducting oxide. Appl Phys Lett, 2008, 92, 113510 doi: 10.1063/1.2891051
[3]
Zou D, Wang D, Chu Z, et al. Fiber-shaped flexible solar cells. Coordin Chem Rev, 2010, 254, 1169 doi: 10.1016/j.ccr.2010.02.012
[4]
Yu J, Wang D, Huang Y, et al. A cylindrical core-shell-like TiO2 nanotube array anode for flexible fiber-type dye-sensitized solar cells. Nanoscale Res Lett, 2011, 6, 94 doi: 10.1186/1556-276X-6-94
[5]
Wang D, Hou S, Wu H, et al. Fiber-shaped all-solid state dye sensitized solar cell with remarkably enhanced performance via substrate surface engineering and TiO2 film modification. J Mater Chem, 2011, 21, 6383 doi: 10.1039/c1jm00016k
[6]
Fan X, Zhang X, Zhang N, et al. Wet-process fabrication of low-cost all-solid wire-shaped solar cells on manganese-plated electrodes. Electrochim Acta, 2015, 161, 358 doi: 10.1016/j.electacta.2015.02.092
[7]
Cai X, Hou S, Wu H, et al. All-carbon electrode-based fiber-shaped dye-sensitized solar cells. Phys Chem Chem Phys, 2012, 14, 125 doi: 10.1039/C1CP22613D
[8]
Cai X, Wu H, Hou S, et al. Dye-sensitized solar cells with vertically aligned TiO2 nanowire arrays grown on carbon fibers. ChemSusChem, 2014, 7, 474 doi: 10.1002/cssc.201301020
[9]
Fu Y, Hou S, Cai X, et al. Transparent conductive oxide-less, flexible, and highly efficient dye-sensitized solar cells with commercialized carbon fiber as the counter electrode. J Mater Chem, 2011, 21, 13776 doi: 10.1039/c1jm12056e
[10]
Hou S, Lv Z, Wu H, et al. Flexible conductive threads for wearable dye-sensitized solar cells. J Mater Chem, 2012, 22, 6549 doi: 10.1039/c2jm16773e
[11]
Peng M, Cai X, Fu Y, et al. Facial synthesis of SnO2 nanoparticle film for efficient fiber-shaped dye-sensitized solar cells. J Power Sources, 2014, 247, 249 doi: 10.1016/j.jpowsour.2013.08.075
[12]
Wang W, Zhao Q, Li H, et al. Transparent, double-sided, ITO-free, flexible dye-sensitized solar sells based on metal wire/ZnO nanowire arrays. Adv Funct Mater, 2012, 22, 2775 doi: 10.1002/adfm.201200168
[13]
Dong B, Hu J, Xiao X, et al. High-efficiency fiber-shaped perovskite solar cell by vapor-assisted deposition with a record efficiency of 10.79%. Adv Mater Technol, 2019, 4, 1900131 doi: 10.1002/admt.201900131
[14]
Fu Y, Lv Z, Hou S, et al. Conjunction of fiber solar cells with groovy micro-reflectors as highly efficient energy harvesters. Energy Environ Sci, 2011, 4, 3379 doi: 10.1039/c1ee01427g
[15]
Liu G, Wang M, Wang H, et al. Hierarchically structured photoanode with enhanced charge collection and light harvesting abilities for fiber-shaped dye-sensitized solar cells. Nano Energy, 2018, 49, 95 doi: 10.1016/j.nanoen.2018.04.037
[16]
Fu Y, Cai X, Wu H, et al. Fiber supercapacitors utilizing pen ink for flexible/wearable energy storage. Adv Mater, 2012, 24, 5713 doi: 10.1002/adma.201202930
[17]
Fu Y, Wu H, Ye S, et al. Integrated power fiber for energy conversion and storage. Energy Environ Sci, 2013, 6, 805 doi: 10.1039/c3ee23970e
[18]
Yu X, Fu Y, Cai X, et al. Flexible fiber-type zinc –carbon battery based on carbon fiber electrodes. Nano Energy, 2013, 2, 1242 doi: 10.1016/j.nanoen.2013.06.002
[19]
Zhang N, Huang F, Zhao S, et al. Photo-rechargeable fabrics as sustainable and robust power sources for wearable bioelectronics. Matter, 2020, 2, 1260 doi: 10.1016/j.matt.2020.01.022
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    Xing Fan, Dechun Zou, Liming Ding. Fiber-like solar cells[J]. Journal of Semiconductors, 2021, 42(5): 050202. doi: 10.1088/1674-4926/42/5/050202
    X Fan, D C Zou, L M Ding, Fiber-like solar cells[J]. J. Semicond., 2021, 42(5): 050202. doi: 10.1088/1674-4926/42/5/050202.
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    Received: 11 March 2021 Revised: Online: Accepted Manuscript: 11 March 2021Uncorrected proof: 11 March 2021Published: 01 May 2021

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      Fiber-like solar cells

      DOI: 10.1088/1674-4926/42/5/050202
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      • Xing Fan:received his PhD degree from Peking University in 2009. Then he joined Chongqing University as a lecturer, and he was promoted to be a full professor in 2016. Now he is the Director of the Smart Energy Fabrics Center at Chongqing University. His research focuses on manganese-based materials and related applications in flexible energy fabrics
      • Dechun Zou:got his PhD degree from Kyushu University in 1990. Then he worked at Mitsubishi Petrochemicals and Casio Computer Co. (1998–2001). He was an associate professor at Kyushu University. Now he is a professor at Peking University. His research interests include light-emitting and photovoltaic materials and devices, and related device physics, as well as new process technologies for device fabrication
      • 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. He is RSC Fellow, the nominator for Xplorer Prize, and the Associate Editors for Science Bulletin and Journal of Semiconductors
      • Corresponding author: dczou@pku.edu.cnding@nanoctr.cn
      • Received Date: 2021-03-11
      • Published Date: 2021-05-10

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