Enhancing perovskite solar cell performance and stability by doping barium in methylammonium lead halide
Journal
Journal of Materials Chemistry A
Journal Volume
5
Journal Issue
34
Pages
18044-18052
Date Issued
2017
Author(s)
Abstract
Organic-inorganic lead halide perovskite solar cells are considered as one of the most promising technologies for future photovoltaics because they show high power conversion efficiency (PCE) and can be fabricated through a simple solution process. Non-toxic alkaline-earth metal cations are suitable candidates to replace toxic lead in perovskite because they maintain the charge balance in perovskite and some of them meet the tolerance factor of Goldschmidt's rule. We investigated four kinds of alkaline-earth metal cations (Mg2+, Ca2+, Sr2+, and Ba2+) to replace lead cations partially. Among these four alkaline-earth metals, the Ba2+ is most suitable for Pb2+ replacement in perovskite films and exhibits the best power conversion efficiency. Furthermore, we systematically studied the crystal structure, absorption behavior and surface morphology of Ba2+-doped perovskite films with different doping levels. The relationship between the charge carrier dynamics and Ba2+ concentration was evaluated by the time-resolved photoluminescence (TRPL) technique. The Ba2+-doped perovskite films that can be processed in the environment containing moisture (1.0% relative humidity) are stable. At the optimal 3.0 mol% Ba2+ replacement, the PCE of the fabricated solar cell is increased from 11.8 to 14.0%, and the PCE of champion devices is as high as 14.9% with increased storage stability. © 2017 The Royal Society of Chemistry.
SDGs
Other Subjects
Alkaline earth metals; Barium; Carrier concentration; Conversion efficiency; Crystal structure; Doping (additives); Efficiency; Lead; Perovskite; Positive ions; Semiconductor doping; Solar cells; Solar power generation; Absorption behaviors; Alkaline Earth metal cations; Charge carrier dynamics; High power conversion; Organic-inorganic; Power conversion efficiencies; Solar cell performance; Time-resolved photoluminescence; Perovskite solar cells
Type
journal article