ID | 119091 |
著者 |
Sachith, Bhagyashree Mahesha
Hokkaido University
Zhang, Zhijing
Hokkaido University
Subramanyam, Palyam
Hokkaido University
Subrahmanyam, Challapalli
Indian Institute of Technology Hyderabad
Tamai, Naoto
Kwansei Gakuin University
Okamoto, Takuya
Hokkaido University
Misawa, Hiroaki
Hokkaido University|National Yang Ming Chiao Tung University
Biju, Vasudevanpillai
Hokkaido University|Indian Institute of Technology Hyderabad
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資料タイプ |
学術雑誌論文
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抄録 | Bandgap-engineered inorganic and hybrid halide perovskite (HP) films, nanocrystals, and quantum dots (PQDs) are promising for solar cells. Fluctuations of photoinduced electron transfer (PET) rates affect the interfacial charge separation efficiencies of such solar cells. Electron donor- or acceptor-doped perovskite samples help analyze PET and harvest photogenerated charge carriers efficiently. Therefore, PET in perovskite-based donor–acceptor (D–A) systems has received considerable attention. We analyzed the fluctuations of interfacial PET from MAPbBr3 or CsPbBr3 PQDs to classical electron acceptors such as 7,7,8,8-tetracyanoquinodimethane (TCNQ) and 1,2,4,5-tetracyanobenzene (TCNB) at single-particle and ensemble levels. The significantly negative Gibbs free energy changes (ΔG°et = –0.16 to – 1.16 eV) of of PET estimated from the donor–acceptor redox potentials, the donor–acceptor sizes, and the solvent dielectric properties help us clarify the PET in the above D–A systems. The dynamic nature of PET is apparent from the decrease in photoluminescence (PL) lifetimes and PL photocounts of PQDs with an increase in the acceptor concentrations. Also, the acceptor radical anion spectrum helps us characterize the charge-separated states. Furthermore, the PL blinking time and PET rate fluctuations (108 to 107 s−1) provide us with single-molecule level information about interfacial PET in perovskites.
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掲載誌名 |
Nanoscale
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ISSN | 20403372
20403364
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出版者 | Royal Society of Chemistry
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巻 | 15
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号 | 17
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開始ページ | 7695
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終了ページ | 7702
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発行日 | 2023-04-10
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権利情報 | This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (https://creativecommons.org/licenses/by/3.0/).
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言語 |
eng
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著者版フラグ |
出版社版
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部局 |
理工学系
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