Dual Self-Assembled Hole Transport Layers for High Efficiency Perovskite Solar Cell
Do-Ha KIM a, Sang-Heon Lee a, Sung-Nam Kwon a, Seok-In Na a
a Jeonbuk National University, South Korea, Jeonju, Korea, Republic of
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
London, United Kingdom, 2023 June 12th - 14th
Organizers: Tracey Clarke, James Durrant and Trystan Watson
Poster, Do-Ha KIM, 269
Publication date: 30th March 2023

Perovskite solar cells (PSCs) are promising technology for converting solar energy into electricity with high efficiency and low cost, which are considered one of the key technologies in a sustainable energy society. In PSCs with a p-i-n structure, applying self-assembling molecules (SAM) using a carbazole functional group and a phosphonic acid anchoring  group to the hole transport layer can effectively reduce non-radiative recombination at the interface and increase power conversion efficiency. However, unfortunately SAM have the physicochemical drawback. So, we here present a new approach to address the drawback of mono-SAM by using dual SAM. Dual SAM can improve energy bandgap alignment and reduce non-radiative recombination resulting in high power conversion efficiency. This new approach achieved approximately 1% improved efficiency while ensuring long-term stability. These results were confirmed by demonstrating that 95% of the efficiency was maintained for more than 500 hours at 65℃. This study paves the way for realization of high performance PSCs. 

This work was supported by the National Research Foundation (NRF) of Korea (NRF-2021R1A2C2010353 and 2020R1I1A1A01051961) and the Korea Electric Power Corporation (CX72220014).

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