Impact of Capacitive Effect and Ion Migration on the Hysteretic Behavior of Perovskite Solar Cells
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- 作者：Bo Chen ; Mengjin Yang ; Xiaojia Zheng ; Congcong Wu ; Wenle Li ; Yongke Yan ; Juan Bisquert ; Germ脿 Garcia-Belmonte ; Kai Zhu ; Shashank Priya
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2015
- 出版时间：December 3, 2015
- 年：2015
- 卷：6
- 期：23
- 页码：4693-4700
- 全文大小：551K
- ISSN：1948-7185
文摘
In the past five years, perovskite solar cells (PSCs) based on organometal halide perovskite have exhibited extraordinary photovoltaic (PV) performance. However, the PV measurements of PSCs have been widely recognized to depend on voltage scanning condition (hysteretic current density鈥搗oltage [J鈥揤] behavior), as well as on voltage treatment history. In this study, we find that varied PSC responses are attributable to two causes. First, capacitive effect associated with electrode polarization provides a slow transient non-steady-state photocurrent that modifies the J鈥揤 response. Second, modification of interfacial barriers induced by ion migration can modulate charge-collection efficiency so that it causes a pseudo-steady-state photocurrent, which changes according to previous voltage conditioning. Both phenomena are strongly influenced by ions accumulating at outer interfaces, but their electrical and PV effects are different. The time scale for decay of capacitive current is on the order of seconds, whereas the slow redistribution of mobile ions requires several minutes.