Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Metal-halide perovskite solar cells (PSCs) recently attained 25.7% power conversion efficiency (PCE), which has the potential to be an excellent next-generation alternative to silicon-based solar cell techniques. However, grain boundaries and surface defects in the perovskite film inevitably lead to non-radiative recombination of photo carriers, which reduces efficiency and stability. Therefore, in order to realize a high-performance PSC, it is necessary to properly control the defects in the perovskite layer. In this regard, we attempted to control the defects in the perovskite layer through a double ammonium ligands passivation strategy (DALPS), which is the organic ammonium materials having monoammonium ligands and diammonium ligands with differences in the alkyl chain length. It was shown that charge recombination was suppressed and charge transports improved by DALPS with a synergetic effect. As a result, DALPS-based PSCs achieved the best PCE of 21.29% and retained 84% of initial PCE after 1900 h at 65°C in the N2 atmosphere.
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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