Publication date: 17th February 2025
Sn–Pb perovskite solar cells (PSCs) have emerged as promising candidates for tandem photovoltaics due to their near-optimal bandgap (~1.25 eV) and broad light absorption up to 1000 nm. However, their practical application is often hindered by limitations in the hole transport layer (HTL). Commonly used HTLs such as PEDOT:PSS and PTAA introduce significant parasitic absorption in the visible to near-infrared region and suffer from energy level mismatches with Sn–Pb perovskites, thereby impeding charge extraction and reducing overall efficiency.
In this study, we present a newly synthesized donor–acceptor copolymer, TTA-mesityl-b-TTA-(dimethylamino)propoxy (cPTANMe), as an alternative HTL tailored for Sn–Pb PSCs. This material exhibits reduced optical absorption in the active spectral range and provides favorable energy level alignment for efficient hole extraction. Its integration also enhances perovskite crystallinity and suppresses void formation at the buried interface, leading to improved film morphology and device stability. These combined advantages make cPTANMe a compelling candidate for scalable printed solar cells and future tandem integration.
Thanks to the National Science and Technology Council (114 -2927-I-005 -503 -, 113-2218-E-007 -012 -), and Innovation and Development Center of Sustainable Agriculture from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan.
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