Interface band structure engineering by ferroelectric polarization in perovskite solar cells

被引:113
作者
Chen, Bo [1 ]
Zheng, Xiaojia [1 ]
Yang, Mengjin [2 ]
Zhou, Yuan [1 ]
Kundu, Souvik [1 ]
Shi, Jian [3 ]
Zhu, Kai [2 ]
Priya, Shashank [1 ]
机构
[1] Virginia Tech, Ctr Energy Harvesting Mat & Syst, Blacksburg, VA 24061 USA
[2] Natl Renewable Energy Lab, Chem & Nanosci Ctr, Golden, CO 80401 USA
[3] Rensselaer Polytech Inst, Dept Mat Sci & Engn, Troy, NY 12180 USA
关键词
Ferroelectric polarization; Band structure; Hysteretic behavior; Organometal halide perovskite; Solar cells; HIGH-PERFORMANCE; EFFICIENCY; HYSTERESIS; SEPARATION; ABSORBER; VOLTAGE; SIZE; GAP;
D O I
10.1016/j.nanoen.2015.03.037
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
We demonstrate the presence of ferroelectric domains in CH(3)NH(3)Pb1(3) by piezoresponse force microscopy and quantify the coercive field to the switching of the polarization of ferroelectric CH(3)NH(3)Pb1(3). For CH(3)NH(3)Pb1(3) perovskite solar cell, negative electric poling decreases the net built-in electric field, driving potential and width of depletion region inside the absorber layer, which hinders charge separation and deteriorates photovoltaic performance; while positive poling boosts these electrostatic parameters and therefore improves the charge separation inside the absorber. Low coercive field (8 kV/cm) enables the switching of CH(3)NH(3)Pb1(3) polarization during the current density-voltage (J-V) measurement. Forward scan initially activates the negative poling, whereas reverse scan first activates the positive poling, which can lead to the J-V hysteretic behavior. Comparative analysis with a traditional ferroelectric 0.25BaTiO(3)-0.75BiFeO(3) solar cell is conducted to confirm the impact of ferroelectric polarization and J-V scanning direction on photovoltaic performance. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:582 / 591
页数:10
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