[13p-PB9-1~49] 12.5 Organic solar cells

[13p-PB9-22] Local Charge Carrier Mobility in CH₃NH₃Pb_xSn_1-xI₃ Perovskite

〇(M2)Hikaru Oga¹, Yuhei Ogomi², Hayase Shuzi², Akinori Saeki¹ (1.Osaka Univ., 2.Kyutech.)

Keywords:Time-resolved microwave conductivity,Organic-inorganic perovskite solar cell,Charge carrier dynamics

Organic-inorganic hybrid perovskites (PVK) consisted of organic cation, halogen, metal have been gaining attention. However, the photoelectric conversion mechanism remains vague. In order to improve the conversion efficiency, it is necessary to elucidate the details for the photoelectric conversion mechanism and design materials by the bottom up based on the principle. We reported the dynamics of charge carriers in CH₃NH₃PbI₃ PVK film by time-resolved microwave conductivity (TRMC) measurement. TRMC allows noncontact evaluation of the dynamics of photogenerated charge carriers using an alternating-current electromagnetic wave with nanosecond time resolution. For the realization of lead-free PVK solar cells, we evaluated low Pb and low bandgap PVK including Pb and Sn by TRMC measurement. PVK was prepared on quartz/mp-TiO₂ and coverd by PMMA, P3HT, and PTAA. The Pb:Sn ratio is 10:0, 7:3, 5:5, and 3:7. We will discuss the effects that the component ratio of Pb and Sn gives local charge carrier mobilities, recombination process, and hole transport.