TY - JOUR
T1 - Effects of electron- and hole-current hysteresis on trap characterization in organo-inorganic halide perovskite
AU - Wu, Fan
AU - Mabrouk, Sally
AU - Han, Miaomiao
AU - Tong, Yanhua
AU - Zhang, Tiansheng
AU - Zhang, Yuchen
AU - Bobba, Raja Sekhar
AU - Qiao, Quinn
N1 - Funding Information:
This work was supported in part by the National Natural Science Foundation of China (62004068; 21607041; 12147219), the Zhejiang Provincial Natural Science Foundation of China (Y20F040001), the Natural Science Foundation of Huzhou City, China (2019YZ02), the Syracuse University Startup Fund, and the U.S.-Egypt Science and Technology (S&T) Joint Fund. This work was derived from the Subject Data supported in whole or part by NAS and USAID, and any opinions, findings, conclusions, or recommendations expressed in the article are those of the authors alone, and do not necessarily reflect the views of USAID or NAS.
Funding Information:
This work was supported in part by the National Natural Science Foundation of China ( 62004068 ; 21607041 ; 12147219 ), the Zhejiang Provincial Natural Science Foundation of China ( Y20F040001 ), the Natural Science Foundation of Huzhou City, China ( 2019YZ02 ), the Syracuse University Startup Fund , and the U.S.-Egypt Science and Technology (S&T) Joint Fund. This work was derived from the Subject Data supported in whole or part by NAS and USAID, and any opinions, findings, conclusions, or recommendations expressed in the article are those of the authors alone, and do not necessarily reflect the views of USAID or NAS.
Publisher Copyright:
© 2022 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences
PY - 2023/1
Y1 - 2023/1
N2 - Charge trap density and carrier mobility of perovskite materials are the critical properties of perovskite solar cells. The space charge limited current (SCLC) method, which measures a dark current–voltage (I-V) curve of a single-carrier device has found extensive use for studying the trap density and charge carrier mobility in perovskite materials. Herein, it was found that the electron- and hole-current in organo-lead perovskite-based single-carrier device undergoes significant hysteresis under forward and reverse scanning due to the mobile ions. In addition, it was also observed that measuring history has a detrimental effect on hysteresis resulting in possible overestimation or underestimation of the extracted electrical values from the SCLC measurement. In the forward/reverse scanning process, the mobile ionic defects enhance/shield the charge in the traps due to ionic charging/discharging, thereby increasing/reducing the interface barrier and net charge in the I-V scanning, which in turn affects the determination of transport properties of the carrier. These results raise quite a few doubts over the direct application of classical SCLC measurements for the accurate characterization of intrinsic transport properties of the mixed ionic-electronic perovskite.
AB - Charge trap density and carrier mobility of perovskite materials are the critical properties of perovskite solar cells. The space charge limited current (SCLC) method, which measures a dark current–voltage (I-V) curve of a single-carrier device has found extensive use for studying the trap density and charge carrier mobility in perovskite materials. Herein, it was found that the electron- and hole-current in organo-lead perovskite-based single-carrier device undergoes significant hysteresis under forward and reverse scanning due to the mobile ions. In addition, it was also observed that measuring history has a detrimental effect on hysteresis resulting in possible overestimation or underestimation of the extracted electrical values from the SCLC measurement. In the forward/reverse scanning process, the mobile ionic defects enhance/shield the charge in the traps due to ionic charging/discharging, thereby increasing/reducing the interface barrier and net charge in the I-V scanning, which in turn affects the determination of transport properties of the carrier. These results raise quite a few doubts over the direct application of classical SCLC measurements for the accurate characterization of intrinsic transport properties of the mixed ionic-electronic perovskite.
KW - Ionic defects
KW - Mobility
KW - Organo-lead perovskite
KW - Space-charge-limited-current
KW - Trap density
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U2 - 10.1016/j.jechem.2022.10.011
DO - 10.1016/j.jechem.2022.10.011
M3 - Article
AN - SCOPUS:85140770942
SN - 2095-4956
VL - 76
SP - 414
EP - 420
JO - Journal of Energy Chemistry
JF - Journal of Energy Chemistry
ER -