SrTiO3/TiO2 composite electron transport layer for perovskite solar cells

Abstract Perovskite solar cells (PSCs) with SrTiO3 mesoporous layer (MPL) generally show higher VOC but lower JSC than those with standard TiO2-MPL. In this letter, we propose a new PSC with SrTiO3/TiO2 composite MPL to overcome this lower JSC problem. The PSC with the SrTiO3/TiO2 composite MPL generated a comparable JSC (19.3 mA/cm2) to that with the TiO2-MPL, with keeping higher VOC, which resulted in relatively high power conversion efficiency of 9.98%.