論文

2021年

Prolongation of the singlet exciton lifetime of nonfullerene acceptor films by the replacement of the central benzene core with naphthalene

Sustainable Energy & Fuels
  • Tomokazu Umeyama
  • Kensho Igarashi
  • Yasunari Tamai
  • Tatsuho Wada
  • Taiki Takeyama
  • Daiki Sasada
  • Keiichi Ishida
  • Tomoyuki Koganezawa
  • Shunsuke Ohtani
  • Kazuo Tanaka
  • Hideo Ohkita
  • Hiroshi Imahori
  • 全て表示

5
7
開始ページ
2028
終了ページ
2035
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1039/D0SE01861A
出版者・発行元
Royal Society of Chemistry ({RSC})

A comprehensive study on the relationship between the structure and the photophysical and photovoltaic properties of acceptor-donor-acceptor (A-D-A) type nonfullerene acceptors (NFAs) is of pivotal importance to obtain design guidelines for high-performance organic photovoltaics (OPVs). In this study, we synthesized a D unit, NTT, in which the central benzene core, indacenodithieno[3,2-b]thiophene (IT), is replaced by naphthalene. Notably, NTTIC, an A-D-A type NFA with NTT as the D unit, showed a longer singlet exciton lifetime in the film than the IT-based benchmark NFA, ITIC. When paired with a conjugated polymer donor, PBDB-T, the NTTIC-based OPV device exhibited a higher power conversion efficiency (PCE = 9.95%) than the ITIC-based device (9.71%). Furthermore, due to the larger domain size of NTTIC in PBDB-T:NTTIC, the exciton diffusion (ED) at the donor/acceptor interface and the charge transfer (CT) were slower (14 ps in total) than those of PBDB-T:ITIC (7 ps in total). Nevertheless, the total efficiency of the ED and CT in PBDB-T:NTTIC was similar to that in PBDB-T:ITIC (95%) owing to the longer singlet exciton lifetime of the NTTIC film. These results demonstrate the high potential of naphthalene-cored D units of A-D-A type NFAs to achieve a long singlet exciton lifetime and a resultant high PCE in NFA-based OPVs.

リンク情報
DOI
https://doi.org/10.1039/D0SE01861A
Scopus
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85103741823&origin=inward
Scopus Citedby
https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85103741823&origin=inward
ID情報
  • DOI : 10.1039/D0SE01861A
  • eISSN : 2398-4902
  • ORCIDのPut Code : 90359313
  • SCOPUS ID : 85103741823

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