[20a-432-1~12] 12.5 Organic solar cells

▲ [20a-432-3] Reduction of voltage loss in tin-lead mixed perovskite solar cells by multi cation engineering for efficiency approaching 20%

〇(PC)Gaurav Kapil¹, Kengo Hamada², Takeru Bessho¹, Takumi Kinoshita¹, Qing Shen³, Taro Toyoda³, Takurou N. Murakami⁴, Hiroshi Segawa¹, Shuzi Hayase² (1.The Uni. of Tokyo, 2.Kyutech, 3.Uni. of Elec., 4.AIST)

Keywords:Perovskite solar cell, Tin-lead, multi-cation engineering

Tin-lead (Sn-Pb) combined perovskite solar cells (PSCs) possess high photocurrents owing to the broad absorption range more than 1000 nm, which makes them an ideal candidate for high power conversion efficiency (PCE). However, Sn-Pb PSCs are still lagging the full Pb based PSCs because of the higher voltage loss, occurring due to the various bulk and surface trap states. To reduce the surface traps, we have recently reported a novel idea of spike energy leading to a PCE of 17.6 % with a Voc of 0.75 V for (FASnI₃)_0.5(MAPbI₃)_0.5 (denoted as FAMA) based absorber (1.25 eV, energy band gap) utilizing a p-i-n configuration. Taking this work, a step further, in the report we will demonstrate a PSC with Sn-Pb perovskite absorber layer reaching 20 % PCE by doing multi-cation engineering at monovalent cation side of perovskite structure.