Capacitive Dark Currents, Hysteresis, and Electrode Polarization in Lead Halide Perovskite Solar Cells

被引:420
作者
Almora, Osbel [1 ]
Zarazua, Isaac [1 ]
Mas-Marza, Elena [1 ]
Mora-Sero, Ivan [1 ]
Bisquert, Juan [1 ,2 ]
Garcia-Belmonte, Germa [1 ]
机构
[1] Univ Jaume 1, Dept Fis, Photovolta & Optoelect Devices Grp, ES-12071 Castellon de La Plana, Spain
[2] King Abdulaziz Univ, Dept Chem, Fac Sci, Jeddah 21589, Saudi Arabia
来源
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2015年 / 6卷 / 09期
关键词
HIGH-PERFORMANCE; LOW-COST; EMERGENCE;
D O I
10.1021/acs.jpclett.5b00480
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Despite spectacular advances in conversion efficiency of perovskite solar cell many aspects of its operating modes are still poorly understood. Capacitance constitutes a key parameter to explore which mechanisms control particular functioning and undesired effects as current hysteresis. Analyzing capacitive responses allows addressing not only the nature of charge distribution in the device but also the kinetics of the charging processes and how they alter the solar cell current. Two main polarization processes are identified. Dielectric properties of the microscopic dipolar units through the orthorhombic-to-tetragonal phase transition account for the measured intermediate frequency capacitance. Electrode polarization caused by interfacial effects, presumably related to kinetically slow ions piled up in the vicinity of the outer interfaces, consistently explain the reported excess capacitance values at low frequencies. In addition, current voltage curves and capacitive responses of perovskite-based solar cells are connected. The observed hysteretic effect in the dark current originates from the slow capacitive mechanisms.
引用
收藏
页码:1645 / 1652
页数:8
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