Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 6, Issue 23, Pages 4693-4700Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.5b02229
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Funding
- U.S. Army [W15P7T-13-C-A910]
- U.S. Department of Energy Sun Shot Initiative under Next Generation Photovoltaics 3 program [DE-FOA-0000990, DE-AC36-08-GO28308]
- Generalitat Valenciana project [PROMETEO/2014/020]
- NSF I/UCRC: Center for Energy Harvesting Materials and Systems through Fundamental Research Program
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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 voltage [J-V] 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-V 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.
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