Pressure Dependence of Mixed Conduction and Photo Responsiveness in Organolead Tribromide Perovskites

Huacai Yan, Tianji Ou, Hui Jiao, Tianyi Wang, Qinglin Wang, Cailong Liu, Xizhe Liu, Yonghao Han, Yanzhang Ma, Chunxiao Gao

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

The electrical transport properties of CH3NH3PbBr3 (MAPbBr3) polycrystals were in situ investigated by alternating-current impedance spectroscopy under high pressures up to 5.6 GPa. It is confirmed that ionic and electronic conductions coexist in MAPbBr3. As pressure below 3.3 GPa ions migration is the predominant process, while above 3.3 GPa electronic conduction becomes the main process. An obvious ionic-electronic transition can be observed. The pressure dependent photo responsiveness of MAPbBr3 was also studied by in situ photocurrent measurements up to 3.8 GPa. The mixed conduction can be clearly seen in photocurrent measurement. Additionally, the photocurrents remain robust below 2.4 GPa, while they are suppressed with pressure-induced partial amorphization. Interestingly, the photoelectric response of MAPbBr3 can be enhanced by high pressure, and the strongest photocurrent value appears in the high-pressure phase II at 0.7 GPa, which is similar to previous results in both MAPbI3 and MASnI3.

Original languageEnglish
Pages (from-to)2944-2950
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume8
Issue number13
DOIs
StatePublished - Jul 6 2017

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