High efficient perovskite solar cells base on niobium doped TiO2 as a buffer layer

Abstract

Here, the effect of lightly Niobium doped TiO layer on the performance of perovskite solar cells has been studied by using solar cell capacitance simulator (SCAPS). N addition, the effects of Niobium concentration, buffer film thickness and operating temperature on the performance of the perovskite solar cell are investigated. For doping level of 3.0 mol% into the TiO layer, cell efficiency of 18.26% with V of 0.96 V, Jsc of 22.45 mA/ cm and FF of 84.25% has been achieved. Calculations show that thickness widening of Nb-doped TiO layer would decrease the efficiency and Voc of the cells. Increase in operating temperature from 300 k to 400 k would weaken the performance of the perovskite solar cell with both pure and Nb-doped TiO layers. However, the cell with Nb-doped TiO layer shows higher stability than the cell with pure TiO buffer at higher temperatures