Ruddlesden–Popper phase 2D perovskite solar cells (PSCs) exhibit improved lifetime while still facing challenges such as phase alignment and up-scaling to module-level devices. Herein, polyelectrolytes are explored to tackle this issue. The contact between perovskite and hole-transport layer (HTL) is important for decreasing interfacial non-radiative recombination and scalable fabrication of uniform 2D perovskite films. Through exploring compatible butylamine cations, we first demonstrate poly(3-(4-carboxybutyl)thiophene-2,5-diyl)-butylamine (P3CT-BA) as an efficient HTL for 2D PSCs due to its great hydrophilicity, relatively high hole mobility and uniform surface. More importantly, the tailored P3CT-BA has an anchoring effect and acts as the buried passivator for 2D perovskites. Consequently, a best efficiency approaching 18 % was achieved and we further first report large-area (2×3 cm2, 5×5 cm2) 2D perovskite minimodules with an impressive efficiency of 14.81 % and 11.13 %, respectively.
Bibliographical noteFunding Information:
This work was supported by the National Key Research and Development Program of China (2019YFE0108600 and 2021YFE011621), National Natural Science Foundation of China (52073198, 22161142003 61911530158, 22073022 and 11874130), Science Foundation of Jiangsu Province (BK20211598), Science and Technology Program of Jiangsu Province (BZ2020011), Science and Technology Program of Suzhou (SYG202037), “111” project, the China Postdoctoral Science Foundation (Grant No. 2021T140495), DNL Cooperation Fund, CAS (DNL202016), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University.
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- 2D Perovskites
- Ruddelsden–Popper Phase
- Solar Cells
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