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

▼ [13p-PB9-20] WO₃ as electron transport material for highly efficient CH₃NH₃PbI₃ perovskite Solar Cells

〇(P)Binglong Lei¹, Vincent Eze¹, Tatsuo Mori¹ (1.AIT)

Keywords:perovksite,solar cell,WO3

In the past five years, perovskite solar cells have remarkably marched with the power conversion efficiency (PCE) elevating from 3.8% in 2009, 15.4% in 2013, to 19.3% in April 2014 ^{(1, 2)}, which has reached a comparative performance with their counterparts—multicrystalline silicon solar cells. The perovskite solar cells are now approaching large-scale application for their properties of cost-effective production, solution processibility, sufficiency in raw material sources and capability for application in flexible substrates. TiO₂ dense-layer is usually used to transport electrons and block holes from injecting into the anode but it is necessary to obtain this layer at a very high temperature (usually about 500℃), which restricts its widespread application on flexible substrates. Moreover, TiO₂ does not possess a comparable electric contact with perovskite in contrast with WO₃. We therefore have conducted investigations with WO₃ as low-temperature HTM for highly efficient solar cells.