Excitation Wavelength Dependent Interfacial Charge Transfer Dynamics in a CH₃NH₃PbI₃ Perovskite Film

• Liu Maning

  School of Engineering, RMIT University

• Endo Masaru

  Institute for Chemical Research, Kyoto University

• Shimazaki Ai

  Institute for Chemical Research, Kyoto University

• Wakamiya Atsushi

  Institute for Chemical Research, Kyoto University

• Tachibana Yasuhiro

  School of Engineering, RMIT University Office for University-Industry Collaboration, Osaka University

Bibliographic Information

Other Title

• Excitation Wavelength Dependent Interfacial Charge Transfer Dynamics in a CH₃NH₃PbI₃ Perovskite Film

Abstract

Elucidation of interfacial charge separation and recombination mechanisms is crucial to improve performance of organic-inorganic metal halide perovskite solar cells. Here, we have investigated influence of initially populated electron and hole potential levels in a perovskite conduction band (CB) and valence band (VB), respectively, by altering an excitation wavelength on interfacial charge separation and recombination dynamics in a CH₃NH₃PbI₃ perovskite film sandwiched by a mesoporous TiO₂ structure as an electron transport material (ETM) and a spiro-OMeTAD film as a hole transport material (HTM). Multi-phasic electron injection reactions are observed over <1.2 to several tens of nanoseconds, while most of holes are injected to a spiro-OMeTAD layer within the transient emission spectroscopy instrument response time (1.2 ns). In contrast, interfacial charge recombination rates are slower (from 5 ms to 1.3 s) with the increase of the excitation wavelength. These kinetics suggest that as long as low excitation intensity is employed, e.g. 10 nJ/cm² or 1 sun (100 mW/cm²), the APCE of ~100% can be expected at any excitation wavelength for the solar cells based on FTO/c-TiO₂/m-TiO₂/MAPbI₃/OMeTAD films.

Journal

• Journal of Photopolymer Science and Technology

  Journal of Photopolymer Science and Technology 31 (5), 633-642, 2018-06-25

  The Society of Photopolymer Science and Technology(SPST)

Keywords

• CH₃NH₃PbI₃ perovskite film
• Electron injection
• Hole injection
• Interfacial charge recombination
• Excitation wavelength dependence

Details

• CRID: 1390282763044852352
• NII Article ID: 130007481470
• NII Book ID: AA11576862
• DOI: 10.2494/photopolymer.31.633
• ISSN: 13496336
• ISSN: 09149244
• NDL BIB ID: 029061639
• Web Site: http://id.ndl.go.jp/bib/029061639
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I029061639
• Web Site: https://www.jstage.jst.go.jp/article/photopolymer/31/5/31_633/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed