Large enhanced conversion efficiency of perovskite solar cells by CsBr doping

• Published in: Journal of materials science Vol. 52; no. 22; pp. 13203 - 13211
• Main Authors: Zhang, Li-Ying, Zhang, Yong, Guan, Wei-Bao, Wang, Ke-Fan, Cheng, Zhen-Xiang, Wang, Yuan-Xu
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.11.2017; Springer; Springer Nature B.V
• Subjects: Absorption; bromides; cesium; Cesium bromides; Cesium ions; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Crystal growth; Crystallography and Scattering Methods; crystals; Doping; Efficiency; Energy conversion efficiency; Energy Materials; iodides; ions; lead; Materials Science; Morphology; Perovskite; Perovskites; Photoelectrons; Photovoltaic cells; Polymer Sciences; Solar cells; Solid Mechanics; X-ray photoelectron spectroscopy; X-ray spectroscopy; Crystal Grains; Optimal Doping Level; Perovskite Films; Perovskite Solar Cells (PSC); Perovskite Precursor Solution
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-017-1429-3

Perovskite solar cells single-doped with Br − or Cs + ions have been proved to be an effective approach to improve their efficiency and stability. In our work, we took advantage of co-doping with Br − and Cs + . At our studied doping levels from CH 3 NH 3 I:PbI 2 :CsBr = 1:1:0 ( x  = 0) to 0.85:1:0.15 ( x  = 0.15), CsBr doping does not introduce any detectable impurity, and the crystal grains grow larger with increasing CsBr doping level. Furthermore, when the CsBr doping level is less than x  = 0.1, it can progressively enhance the optical absorption of the perovskite film, although the absorption begins to decrease when the doping level rises above x  = 0.1. X-ray photoelectron spectroscopy measurements show that Br − has successfully replaced I − and bonds with Pb 2+ after CsBr doping. At the optimized doping level of x  = 0.1, the incorporation of CsBr in the reaction system can improve the morphology of perovskite films and greatly enhance the efficiency from 9.8% for undoped sample to 13.6%, better than single Br − or Cs + doping. Our result shows that CsBr doping is an effective method to enhance the efficiency of perovskite solar cells.