Transparent conducting oxide free backside illuminated perovskite solar cells

Recently, hybrid perovskites have attracted great attention because of their promising applications in solar cells. However, perovskite solar devices reported till now are mostly based on transparent conducting oxide (TCO) substrates which account for a large proportion in the total cost. Herein, TCO-free perovskite solar cells are fabricated. A photo-electricity conversion efficiency of 5.27% is obtained with short circuit current density (J(sc)) of 10.7 mA/cm(2), open circuit voltage (V-oc) of 0.837 V, and fill factor of 0.588. This study points a feasible way of replacing TCO substrate by low cost substrates, indicating promising potentials in solar energy conversion applications. (C) 2015 AIP Publishing LLC.Ministry of Science and Technology [2011CB933002, 2012CB932702]; National Science Foundation of China [61306079, 61171023]SCI(E)EIARTICLEwtaosun@pku.edu.cn; lmpeng@pku.edu.cn110