Impact of Capacitive Effect and Ion Migration on the Hysteretic Behavior of Perovskite Solar Cells.
J Phys Chem Lett
; 6(23): 4693-700, 2015 Dec 03.
Article
em En
| MEDLINE
| ID: mdl-26550850
ABSTRACT
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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Texto completo:
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Óxidos
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Energia Solar
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Titânio
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Compostos de Cálcio
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Íons
Limite:
Humans
Idioma:
En
Revista:
J Phys Chem Lett
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Estados Unidos