[17a-303-1~16] 12.5 Organic solar cells

▲ [17a-303-12] Dual role of Cs₂SnI₆: A hole transporter and an absorber for perovskite based solar cells

〇(P)Gaurav Kapil¹, Takeshi Ohta², Yuhei Ogomi², Tsuguo Koyonagi², Kenji Yoshino³, Qing Shen⁴, Taro Toyoda⁴, Takashi Minemoto⁵, Takurou N. Murakami⁶, Hiroshi Segawa¹, Shuzi Hayase² (1.University of Tokyo, 2.Kyu. Inst. of Tech., 3.Uni. of Miyazaki, 4.Uni. of Electrocomm., 5.Ritsueikan Uni., 6.AIST)

Keywords:New perovskite materials, Cs2SnI6, Lead free solar cells

Over the last one year, organic-inorganic lead (Pb) halide based perovskite solar cells (PSCs) have successfully achieved more than 20% photoconversion efficiencies (PCE) in a variety of solar cell architectures. These overwhelming results are mainly due to its good ambipolar electron and hole transport properties, high excitation carrier life time and absorption coefficients. However, the presence of Pb demands to look out for a Pb free material with similar properties. Therefore, there has been a continuous research interest for Pb free new perovskite and perovskite related materials such as Cs₂SnI₆. Recent studies demonstrated that Cs₂SnI₆ works as a good hole transporter (HT) in dye sensitized solar cells (DSSCs) and also it can be used as lead free absorber in PSCs with PCE less than 1% so far. Here, in this work we present the reasons for low performance of Cs₂SnI₆ based solar cells and possibilities to increase its performance.