[19a-G202-1~8] 12.5 Organic solar cells

▲ [19a-G202-6] Highly efficient lead/tin mixed perovskite solar cells by interface modification

〇(P)Gaurav Kapil¹, Kengo Hamada², Yuhei Ogomi², Takeru Bessho¹, Takumi Kinoshita¹, Qing Shen³, Taro Toyoda³, Takurou N. Murakami⁴, Hiroshi Segawa¹, Shuzi Hayase² (1.The Uni. Tokyo, 2.Kyu. Inst. Tech., 3.Uni. Electro Comm., 4.AIST)

Keywords:Tin-lead mixed perovskite solar cells, Voltage loss, High efficiency

Tin-lead (Sn-Pb) alloyed perovskite solar cell (PSC) shows high photocurrents due to its broad absorption spectrum, reaching the far infra-red wavelength around 1050 nm [1,2]. Assuming an ideal voltage loss of 0.4 V, theoretically a voltage of ~0.8 V can be achieved. But as reported earlier [2], Sn based solar cell undergoes a self-oxidation from Sn²⁺ to Sn⁴⁺, creating many trap states within perovskite and at the interface as well, which reduces the V_oc. In this work, we decreased the voltage loss by interface modification, and increased the V_oc of solar cell to 0.75 V with photoconversion efficiency (PCE) of 17.6% utilizing the same absorber layer.