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Relating open-circu...
Relating open-circuit voltage losses to the active layer morphology and contact selectivity in organic solar cells
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- Tang, Zheng (author)
- Linköpings universitet,Institutionen för fysik, kemi och biologi,Tekniska fakulteten,Donghua Univ, Peoples R China
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- Wang, Jing (author)
- Donghua University,Donghua Univ, Peoples R China
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- Melianas, Armantas (author)
- Linköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska fakulteten
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- Wu, Yang (author)
- Xi'an Jiaotong University,Xi An Jiao Tong Univ, Peoples R China
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- Kroon, Renee, 1982 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Sweden
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- Li, Weiwei (author)
- Chinese Academy of Sciences,Chinese Acad Sci, Peoples R China
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- Ma, W. (author)
- Xi'an Jiaotong University,Xi An Jiao Tong Univ, Peoples R China
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- Andersson, Mats, 1966 (author)
- Flinders University of South Australia,Flinders Univ S Australia, Australia
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- Ma, Z. F. (author)
- Donghua University,Donghua Univ, Peoples R China
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- Wanzhu, Cai (author)
- Linköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska fakulteten
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- Tress, W. (author)
- Ecole Polytechnique Federale de Lausanne (EPFL),Swiss Federal Institute of Technology in Lausanne (EPFL),Ecole Polytech Fed Lausanne, Switzerland
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- Inganäs, Olle (author)
- Linköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska fakulteten
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(creator_code:org_t)
- 2018
- 2018
- English.
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In: Journal of Materials Chemistry A. - : Royal Society of Chemistry (RSC). - 2050-7488 .- 2050-7496. ; 6:26, s. 12574-12581
- Related links:
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https://doi.org/10.1...
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Abstract
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- We demonstrate that voltage losses due to both radiative and non-radiative recombination of charge carriers are strongly dependent on D/A phase separation. By processing the active layer with various solvent additives, we create distinct morphologies that lead to significantly different device open-circuit voltages (VOC), even though the charge transfer state energy (ECT) of the D/A blend remains rather constant. We find that radiative recombination losses are significantly increased for a finely intermixed morphology, due to the large D/A interface area. This leads to a total recombination loss of ECT - qVOC ≈ 0.7 eV. However, considerably smaller losses (0.5 eV), due to suppressed non-radiative recombination, are possible in solar cells where the D/A materials are organized to only allow for selective charge carrier extraction. Using a drift diffusion model, we show that the origin of the reduced non-radiative recombination losses is related to an effect which has not been considered for 'optimized' solar cells-the suppression of minority carrier diffusion to the 'wrong' contact. Our results suggest that the built-in field is not sufficiently strong even in 'optimized' organic solar cells and that selective carrier extraction is critical for further improvements in VOC.
Subject headings
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Analytisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Analytical Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
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- art (subject category)
- ref (subject category)
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- By the author/editor
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Tang, Zheng
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Wang, Jing
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Melianas, Armant ...
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Wu, Yang
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Kroon, Renee, 19 ...
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Li, Weiwei
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Ma, W.
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Andersson, Mats, ...
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Ma, Z. F.
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Wanzhu, Cai
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Tress, W.
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Inganäs, Olle
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Physical Chemist ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Analytical Chemi ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
- Articles in the publication
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Journal of Mater ...
- By the university
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Chalmers University of Technology
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Linköping University