TY - JOUR
T1 - Pressure Dependence of Mixed Conduction and Photo Responsiveness in Organolead Tribromide Perovskites
AU - Yan, Huacai
AU - Ou, Tianji
AU - Jiao, Hui
AU - Wang, Tianyi
AU - Wang, Qinglin
AU - Liu, Cailong
AU - Liu, Xizhe
AU - Han, Yonghao
AU - Ma, Yanzhang
AU - Gao, Chunxiao
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/7/6
Y1 - 2017/7/6
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85022061795&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.7b01022
DO - 10.1021/acs.jpclett.7b01022
M3 - Article
C2 - 28613889
AN - SCOPUS:85022061795
SN - 1948-7185
VL - 8
SP - 2944
EP - 2950
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 13
ER -