Solution processed nano-ZnMgO interfacial layer for highly efficient inverted perovskite solar cells

Interfacial layer has a significant impact on the achievement of highly efficient organic-inorganic hybrid perovskite solar cells (PSCs). Here, we introduced a nano-ZnMgO (magnesium doped ZnO, abbreviated as ZnMgO) as interfacial layer between [6, 6]-Phenyl C-61 butyric acid methyl ester (PC61 BM) layer and Al electrode to replace LiF or ZnO interlayer and enhance device performance. The device efficiency has been improved from 11.43% to 15.61% and the hysteresis was decreased dramatically. Such huge enhancement of power convert efficiency (PCE) can be attributed to the low dark current density, enhancement of electron-selective contact, and low energy barrier at the PC61 BM/Al interface. We suggest that this simple nano-scale interlayer can provide an efficient charge transport and extraction for highly efficient PSCs. (C) 2018 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.