Improved efficiency of perovskite photovoltaics based on Ca-doped methylammonium lead halide

Hybrid lead halide perovskite structured materials have created enormous expectations for low-cost and high-performance optoelectronic devices. The light-harvesting active layer of perovskite solar cell consists of hybrid organic-inorganic lead halide-based material. In this study, we successfully fabricated the perovskite photovoltaics with partial substitution of the lead cation (Pb2+) with calcium ion (Ca2+). The incorporation of Ca2+ into the original structure was analyzed to observe the doping effect on the crystalline structure and the optical properties. Moreover, UV-vis spectra showed the decreased bandgap with ascending the dopants Ca2+ amount. 1.0 mol% Ca-doped perovskite film has the lower emission energy, and it shows the low recombination behavior. After optimizing the perovskite solar cells, the V-oc is increased from 0.93 to 0.98 V, the J(sc) is increased from 17.4 to 19.1 mA/cm(2) and the power conversion efficiency is enhanced from 10.7 to 12.9% by using 1.0 mol% Ca-doped perovskite material. (C) 2017 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.