Exploring Lead and Tin Perovskite Solar Cells by Microwave Conductivity and Machine Learning
Akinori Saeki a
a Osaka University, Japan, FRC, 2-1Yamada-oka,, Suita, 565, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP23)
Kobe, Japan, 2023 January 22nd - 24th
Organizers: Seigo Ito, Hideo Ohkita and Atsushi Wakamiya
Invited Speaker Session, Akinori Saeki, presentation 017
DOI: https://doi.org/10.29363/nanoge.iperop.2023.017
Publication date: 21st November 2022

Organic–inorganic hybrid lead halide perovskite solar cells (Pb-PSC) have attracted considerable attention as low-cost, lightweight, and versatile next-generation solar cells, and their PCEs have been increased to more than 25% in the last decade. Nonetheless, the use of hazardous Pb is a significant concern in commercialization, and drove the development of Pb-free PSCs, in particular, Sn-based PSCs (Sn-PSC). However, the spontaneous degradation of tin perovskites requires special measurement protocols; therefore, numerous experiments should be performed to ensure result reliability. Herein, we report a multivariate analysis for exploring A-site organic cation mixing in tin iodide perovskite (ASnI3) solar cells (PSC), which are the most suitable Pb-free PSC candidates.[1] To address the common drawbacks of Sn perovskites (facile oxidation of Sn2+ to Sn4+ and large degree of mixing), we proposed an efficient experimental screening method (time-resolved microwave conductivity: TRMC[2] etc) using 133 types of environmentally stable A2Sn(IV)I6 zero-dimensional pseudo-perovskites to predict the PCE of ASn(II)I3, in which A is a ternary or quaternary mixed organic cation (namely metylammonium, formamidinium (FA), dimethylammonium, guanidinium, ethylammonium, acetamidinium, trimethylammonium, imidazolium, or phenylethylammonium (PEA)).[4] The high correlation coefficient of our model (0.953) and experimental validation (0.982) allowed us to identify a new (FA0.92IM0.08)0.9PEA0.1SnI3 Sn-PSC with a PCE of 7.22%. Our results provide a basis for exploring A-site cation mixing in Sn-PSCs for improving their performance.

We acknowledge the financial support from Core Research for Evolutional Science and Technology (CREST) (Grant No. JPMJCR2107), the Advanced Low Carbon Technology Research and Development Program (ALCA) (Grant No. JPMJAL1603), and the MIRAI program (Grant No. JPMJMI22E2) of the Japan Science and Technology Agency (JST) and KAKENHI of the Japan Society for the Promotion of Science (JSPS) (Grant Nos. JP20H05836 and JP20H00398). A. S. and A. W. are thankful for the financial support received from the Collaborative Research Program of the Institute for Chemical Research, Kyoto University (Grant Nos. 2020-39 and 2021-39).

We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info