Reducing optical losses and enhancing charge extraction in Sn-Pb perovskite solar cells with a copolymer hole transport layer

Huang, Zhi-Ying and Qiu, Wei-Jia and Wang, Chang-Hao and Dong, Yueyao and Dabóczi, Mátyás and Shih, Yen-Chen and Chiu, Po-Han and Li, Yun-Shan and Huang, Chi-Jing and Ko, Chung-Wen and Eslava, Salvador and Huang, Chieh-Szu and Macdonald, Thomas J. and Lin, Chieh-Ting (2025) Reducing optical losses and enhancing charge extraction in Sn-Pb perovskite solar cells with a copolymer hole transport layer. MATERIALS TODAY ENERGY, 53. No. 101979. ISSN 2468-6069

Text 1-s2.0-S246860692500187X-main.pdf - Published Version Restricted to Repository staff only Download (4MB) | Request a copy

Abstract

Sn-Pb perovskites are recognized for their broad absorption range and their optimal bandgap making them highly promising for tandem solar cell applications. However, conventional hole transport layers (HTLs) such as PEDOT:PSS and PTAA suffer from parasitic absorption and energy level misalignment with Sn-Pb perovskites, thereby limiting photovoltaic performance. To address these challenges, this study introduces a newly synthesized copolymer, TTA-mesityl-b-TTA-(dimethylamino)propoxy (cPTANMe), as an optimized HTL material. Unlike PEDOT:PSS, cPTANMe significantly reduces optical losses within the absorption range of Sn-Pb perovskites by minimizing parasitic absorption. Additionally, cPTANMe overcomes the energy level misalignment associated with PTAA, thereby enhancing charge extraction efficiency. Beyond improving charge transfer properties, incorporating cPTANMe enhances the crystallinity of the perovskite absorber layer and suppresses formation of voids at the buried interface, resulting in superior film uniformity. These combined advantages establish cPTANMe as a promising alternative to PEDOT:PSS and PTAA, contributing to enhanced efficiency in Sn-Pb PSCs. This breakthrough not only advances the performance of Sn-Pb perovskite solar cells but also lays the foundation for their integration into next-generation tandem solar cell technologies, paving the way for new frontiers in photovoltaic research and development.

Actions (login required)

Edit Item