Charge Injection Mechanism at Heterointerfaces in CH 3 NH 3 PbI 3 Perovskite Solar Cells Revealed by Simultaneous Time-Resolved Photoluminescence and Photocurrent Measurements

Organic-inorganic hybrid perovskite solar cells are attracting much attention due to their excellent photovoltaic properties. In these multilayered structures, the device performance is determined by complicated carrier dynamics. Here, we studied photocarrier recombination and injection dynamics in...

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Published inThe journal of physical chemistry letters Vol. 8; no. 5; pp. 954 - 960
Main Authors Handa, Taketo, Tex, David M, Shimazaki, Ai, Wakamiya, Atsushi, Kanemitsu, Yoshihiko
Format Journal Article
LanguageEnglish
Published United States 02.03.2017
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Abstract Organic-inorganic hybrid perovskite solar cells are attracting much attention due to their excellent photovoltaic properties. In these multilayered structures, the device performance is determined by complicated carrier dynamics. Here, we studied photocarrier recombination and injection dynamics in CH NH PbI perovskite solar cells using time-resolved photoluminescence (PL) and photocurrent (PC) measurements. It is found that a peculiar slowdown in the PL decay time constants of the perovskite layer occurs for higher excitation powers, followed by a decrease of the external quantum efficiency for PC. This indicates that a carrier-injection bottleneck exists at the heterojunction interfaces, which limits the photovoltaic performance of the device in concentrator applications. We conclude that the carrier-injection rate is sensitive to the photogenerated carrier density, and the carrier-injection bottleneck strongly enhances recombination losses of photocarriers in the perovskite layer at high excitation conditions. The physical origin of the bottleneck is discussed based on the result of numerical simulations.
AbstractList Organic-inorganic hybrid perovskite solar cells are attracting much attention due to their excellent photovoltaic properties. In these multilayered structures, the device performance is determined by complicated carrier dynamics. Here, we studied photocarrier recombination and injection dynamics in CH NH PbI perovskite solar cells using time-resolved photoluminescence (PL) and photocurrent (PC) measurements. It is found that a peculiar slowdown in the PL decay time constants of the perovskite layer occurs for higher excitation powers, followed by a decrease of the external quantum efficiency for PC. This indicates that a carrier-injection bottleneck exists at the heterojunction interfaces, which limits the photovoltaic performance of the device in concentrator applications. We conclude that the carrier-injection rate is sensitive to the photogenerated carrier density, and the carrier-injection bottleneck strongly enhances recombination losses of photocarriers in the perovskite layer at high excitation conditions. The physical origin of the bottleneck is discussed based on the result of numerical simulations.
Author Wakamiya, Atsushi
Kanemitsu, Yoshihiko
Shimazaki, Ai
Tex, David M
Handa, Taketo
Author_xml – sequence: 1
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  surname: Tex
  fullname: Tex, David M
  organization: Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
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  surname: Shimazaki
  fullname: Shimazaki, Ai
  organization: Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
– sequence: 4
  givenname: Atsushi
  surname: Wakamiya
  fullname: Wakamiya, Atsushi
  organization: Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
– sequence: 5
  givenname: Yoshihiko
  orcidid: 0000-0002-0788-131X
  surname: Kanemitsu
  fullname: Kanemitsu, Yoshihiko
  organization: Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
BackLink https://www.ncbi.nlm.nih.gov/pubmed/28185455$$D View this record in MEDLINE/PubMed
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Snippet Organic-inorganic hybrid perovskite solar cells are attracting much attention due to their excellent photovoltaic properties. In these multilayered structures,...
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Title Charge Injection Mechanism at Heterointerfaces in CH 3 NH 3 PbI 3 Perovskite Solar Cells Revealed by Simultaneous Time-Resolved Photoluminescence and Photocurrent Measurements
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