期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 17, 页码 9081-9085出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta05819d
关键词
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资金
- Research Grants Council of the Hong Kong Special Administrative Region, China [T23-713/11]
- National Natural Science Foundation of China [21303150]
Although Cl-doping is a common technique for achieving high photovoltaic (PV) performance, the Cl content is negligibly small and cannot easily be tuned. Therefore, we herein study the formation chemistry of Cl-doped perovskites by examining the chemical interactions between thermally evaporated MAI and PbCl2 through X-ray photoemission spectroscopy (XPS). Weshowthat PbCl2 is not stable at the MAI/PbCl2 contact surface. The Cl atom readily detaches from the PbCl2, which subsequently initiates electron transition from Pb to MAI. Via thermal-evaporation, a perovskite with a high PbCl2 content can be prepared and examined. We found that the presence of metallic Pb, associated with increased Cl content, can quench the photogenerated exciton in PV devices. By optimizing the ratio of MAI : PbCl2, a perovskite solar cell with similar to 6% efficiency was obtained.
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