Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Organic-inorganic halide perovskites have emerged as excellent candidates for low-cost photovoltaics and optoelectronics. While the predominant recent trend in designing perovskites for efficient and stable solar cells has been to mix different A-site cations, the role of A-site cations is still limited to tune the lattice and bandgap of perovskites. Herein we compare the optoelectronics properties of acetamidinum (Ace) and guanidinium (Gua) mixed methylammonium lead iodide perovskites and shed a light on the hidden role of A-site cation on the carrier mobility of mixed-cation lead iodide perovskites. The cations do not affect the bandgap of the perovskites as the orbitals from Ace and Gua do not contribute to the band edges of the material. However, the mobility of the Ace mixed perovskite is significantly enhanced to be an order of magnitude higher than the pristine perovskite. As a result, we apply the Ace mixed perovskite in hole-conductor-free printable triple mesoscopic perovskite solar cell and obtain a stabilized PCE over 18% (certified 17.7%), which is the highest certified efficiency so far.
The authors acknowledge financial support from the National Natural Science Foundation of China (Grant No. 22075094), the National Key Research and Development Program of China (Grant No. 2016YFA0201101) and the Fundamental Research Funds for the Central Universities. We thank the Analytical and Testing Center of Huazhong University of Science and Technology (HUST) for performing various characterizations.
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