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Energy level offset...
Energy level offsets determine the interplay between charge and energy transfer in all-small-molecule organic solar cells
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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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- Feng, Junyi (author)
- Guangzhou University
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- Peng, Jun (author)
- Guangzhou University
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- Chen, Zhifeng (author)
- Guangzhou University
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- Zhang, Chengyun (author)
- Guangzhou University
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- Zhao, Ningjiu (author)
- South China University of Technology
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- Zou, Xianshao (author)
- Lund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Kemisk fysik,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,LU profilområde: Ljus och material,Lunds universitets profilområden,Other operations, LTH,Faculty of Engineering, LTH,Chemical Physics,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH,LU Profile Area: Light and Materials,Lund University Profile areas
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- Chen, Zhe (author)
- Jinan University
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- Liu, Cuihong (author)
- Guangzhou University
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- Zhang, Wei (author)
- Guangzhou University
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(creator_code:org_t)
- 2023
- 2023
- English.
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In: Chemical Engineering Journal. - 1385-8947. ; 475
- Related links:
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http://dx.doi.org/10...
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Abstract
Subject headings
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- All-small-molecule organic solar cells (ASM OSCs) hold great promise in OSCs owing to their defined structures, simple purification, and good reproducibility, but are challenging for further improved efficiency. The energy level strategy has been broadly applied to obtain a better performance; however, a comprehensive understanding of the effects of energy level offset on photoexcitation dynamics in ASM OSCs is rarely studied. Herein, for Y-series molecules (Y6, Y10, Y5, and BTP-4F-12) based ASM OSCs, the effect of energy level offset on charge photogeneration was investigated using steady-state and time-resolved spectroscopies. We found that both energy and charge transfer could occur in blend films. A method to quantitatively analyze the contribution of charge and energy transfer processes was developed. For BTR-Cl:Y6 with the highest LUMO level offset, ∼ 23% of photogenerated excitons in donor dissociated via “energy transfer and the subsequent charge transfer” pathway, suggesting that the energy transfer in blend films should also be considered. And for the hole transfer, the excitons in Y-series molecules can only be effectively dissociated when the HOMO energy level offset is higher than 0.11 eV. Besides, a higher energy level offset would also suppress carrier recombination in ultrafast timescale. These results may shed light on the design of ASM OSCs.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik -- Energisystem (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering -- Energy Systems (hsv//eng)
Keyword
- ASM OSCs
- Charge photogeneration
- Energy level offsets
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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Wen, Guanzhao
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Hu, Rong
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Feng, Junyi
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Peng, Jun
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Chen, Zhifeng
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Zhang, Chengyun
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show more...
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Zhao, Ningjiu
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Zou, Xianshao
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Chen, Zhe
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Liu, Cuihong
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Zhang, Wei
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show less...
- About the subject
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Environmental En ...
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and Energy Systems
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Chemical Enginee ...
- By the university
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Lund University