Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
The efficiency of flexible perovskite solar cells (f-PSCs) has recently reached power conversion efficiency (PCE) as high as 19.5% [1]. Although still lagging behind their rigid counterparts, which in very short time have rocketed 25.2% efficiency [2], f-PSCs present several appealing features, such as bendability, conformability and high power-to-weight ratio [3], that make them good candidates for several applications, from consumer electronics to avionics and spacecrafts [4].
We present the synthesis of poly-3-hexylthiophene (P3HT)-derivated HTMs, embodying benzothiadiazole (BDT) moieties as electron-poor host. BDT was inserted along P3HT polymeric backbone, creating a donor-acceptor system able to promote the charge mobility throughout the HTM. Benzothiadiazole-modified P3HT (BTD-P3HT)[5] was used as hole transport material (HTM) in f-PSCs and led to PCE comparable to commercially available P3HT and showed improved stability under continuous illumination. It was also employed in 6×6 cm2 modules, delivering 6.9% efficiency on 16 cm2 of active area and demonstrating its feasibility for large area manufacture.
[1] K. Huang, Y. Peng, Y.Y. Gao, J. Shi, H. Li, X. Mo, H. Huang, Y.Y. Gao, L. Ding, J. Yang, High-Performance Flexible Perovskite Solar Cells via Precise Control of Electron Transport Layer, Adv. Energy Mater. 9 (2019) 1901419. https://doi.org/10.1002/aenm.201901419.
[2] NREL, Best Research-Cell Efficiency Chart | Photovoltaic Research | NREL, Best Res. Effic. Chart | Photovolt. Res. | NREL. (2021) https://www.nrel.gov/pv/cell-efficiency.html. https://www.nrel.gov/pv/cell-efficiency.html (accessed April 28, 2021).
[3] M. Kaltenbrunner, G. Adam, E.D. Głowacki, M. Drack, R. Schwödiauer, L. Leonat, D.H. Apaydin, H. Groiss, M.C. Scharber, M.S. White, N.S. Sariciftci, S. Bauer, Flexible high power-per-weight perovskite solar cells with chromium oxide-metal contacts for improved stability in air, Nat. Mater. 14 (2015) 1032–1039. https://doi.org/10.1038/nmat4388.
[4] J. Zhang, W. Zhang, H.M. Cheng, S.R.P. Silva, Critical review of recent progress of flexible perovskite solar cells, Mater. Today. (2020). https://doi.org/10.1016/j.mattod.2020.05.002.
[5] F. De Rossi, G. Renno, B. Taheri, N. Yaghoobi Nia, V. Ilieva, A. Fin, A. Di Carlo, M. Bonomo, C. Barolo, F. Brunetti, Modified P3HT materials as hole transport layers for flexible perovskite solar cells, J. Power Sources. 494 (2021) 229735. https://doi.org/10.1016/j.jpowsour.2021.229735.
The authors would like to acknowledge the Italian Space Agency (ASI) for funding the PEROSKY project.
FDR, BT, FB would like to acknowledge the European Union’s Horizon 2020 Research and Innovation Programme under grant agreement No763989 APOLO. This publication reflects only the author’s views and the European Union is not liable for any use that may be made of the information contained therein.
NYN and ADC would like to acknowledge the support of the Italian Ministry of Economic Development in the framework of the Operating Agreement with ENEA for Research on the Electric System.
The authors greatly acknowledge Luigi Angelo Castriotta at CHOSE, Department of Electronic Engineering, Università degli Studi di Roma Tor Vergata, for laser scribing training and fruitful discussion.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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