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Excited-state properties of Y-series small molecule semiconductors
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- Wen, Guanzhao (author)
- Guangzhou University
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- Hu, Rong (author)
- Chongqing University of Arts and Sciences
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- Su, Xiaojun (author)
- Lund University,Lunds universitet,Kemisk fysik,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Chemical Physics,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH,Songshan Lake Materials Laboratory
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- (creator_code:org_t)
- Elsevier BV, 2021
- 2021
- English.
- In: Dyes and Pigments. - : Elsevier BV. - 0143-7208. ; 192
- Journal article (peer-reviewed)
Abstract
Subject headings
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- The emergence of the Y series small molecule semiconductors, Y6 and its derivatives, have significantly improved the performance of polymer solar cells (PSCs). However, the excited-state properties of these Y-series small molecule semiconductors which are highly important for designing high-performance PSCs, need to be illustrated. In this work, the excited-state properties and electronic structures of the Y-series small molecules (Y5, Y6, Y10, N3, Y6-BO-4F, and Y6-BO-4Cl) have been systematically studied by using steady-state and time-resolved spectroscopies and quantum chemical calculations. It is shown that the influence of alkyl chains at the nitrogen atom of the pyrrole ring is weak for the electron affinities, ionization potentials, electron and hole reorganization energies and singlet exciton lifetime of Y molecules. Meanwhile, these parameters are found to be varied with the types of electron-deficient termini. Moreover, we find that Y10 and Y5 have the shortest singlet exciton lifetime in solution and the longest singlet exciton lifetime in film (~1100 ps), suggesting the engineering of electron-deficient termini can significantly influence the excited-state lifetime in solution and film. Our work could provide a guideline for designing Y-series acceptor materials for high-performance polymer solar cells.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Excited state
- Non-fullerene acceptors
- Polymer solar cells
- Y-series molecules
Publication and Content Type
- art (subject category)
- ref (subject category)
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- Wen, Guanzhao
- Hu, Rong
- Su, Xiaojun
- Chen, Zhifeng
- Zhang, Chengyun
- Peng, Jun
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- Zou, Xianshao
- He, Xiaochuan
- Dong, Geng
- Zhang, Wei
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- NATURAL SCIENCES
- NATURAL SCIENCES
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- Lund University
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