Work

Alkali Metal Doping for Improved CH 3 NH 3 PbI 3 Perovskite Solar Cells

Year: 2017

Type: article

Abstract: Organic–inorganic hybrid halide perovskites are proven to be a promising semiconductor material as the absorber layer of solar cells. However, the perovskite films always suffer from nonuniform coverage or high trap state density due to the polycrystalline characteristics, which degrade the photoelectric properties of thin films. Herein, the alkali metal ions which are stable against oxidation and reduction are used in the perovskite precursor solution to induce the process of crystallization and nucleation, then affect the properties of the perovskite film. It is found that the addition of the alkali metal ions clearly improves the quality of perovskite film: enlarges the grain sizes, reduces the defect state density, passivates the grain boundaries, increases the built‐in potential ( V bi ), resulting to the enhancement in the power conversion efficiency of perovskite thin film solar cell.

Source: Advanced Science

DOI: 10.1002/advs.201700131

Authors: Wangen Zhao, Zhun Yao, Fengyang Yu, Dong Yang, Shengzhong (Frank) Liu

Institutions: Shaanxi Normal University, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Collaborative Innovation Center of Chemistry for Energy Materials

Language: English

Topic: Perovskite Materials and Applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $6,730