Sanggyun Kim1,Sina Sabury1,Austin Jones1,John Reynolds1,Juan Pablo Correa Baena1
Georgia Institute of Technology1
Sanggyun Kim1,Sina Sabury1,Austin Jones1,John Reynolds1,Juan Pablo Correa Baena1
Georgia Institute of Technology1
Despite significant progress in organic-inorganic hybrid perovskite solar cells (PSCs) with a certified power conversion efficiency of 25.2%, long-term stability remains to be one of the critical challenges for PSC commercialization. While hole transport layers (HTL) play a crucial role in device performance of PSCs, they are shown to be a limiting factor toward achieving long-term stability in devices, stemming from interfacial degradation between perovskites and HTLs, thermal/moisture induced degradation, and ionic migration. Here, we explore new dopant-free conjugated polymer-based HTLs that are resistant to high temperatures. The new conjugated polymers are designed accordingly with various side chains, functional groups, and/or degree of polymerizations to obtain good film-forming properties, high hole mobility, high glass transition temperature (T<sub>g</sub>), and suitable HOMO-LUMO energy levels. These new polymers are further incorporated into devices to analyze their effect on perovskite solar cell efficiency and stability at elevated temperature and under illumination over 500 hours.