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On the understandin...
On the understanding of energy loss and device fill factor trade-offs in non-fullerene organic solar cells with varied energy levels
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- Zhang, Xuning (författare)
- Beihang Univ, Peoples R China; Natl Ctr Nanosci & Technol, Peoples R China
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- Yao, Nannan (författare)
- Linköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska fakulteten
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- Wang, Rui (författare)
- Nanjing Univ, Peoples R China
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- Li, Yanxun (författare)
- Natl Ctr Nanosci & Technol, Peoples R China
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- Zhang, Dongyang (författare)
- Beihang Univ, Peoples R China
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- Wu, Guangbao (författare)
- Beihang Univ, Peoples R China
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- Zhou, Jiyu (författare)
- Beihang Univ, Peoples R China
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- Li, Xing (författare)
- Beihang Univ, Peoples R China
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- Zhang, Hong (författare)
- Natl Ctr Nanosci & Technol, Peoples R China
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- Zhang, Jianqi (författare)
- Natl Ctr Nanosci & Technol, Peoples R China
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- Wei, Zhixiang (författare)
- Natl Ctr Nanosci & Technol, Peoples R China
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- Zhang, Chunfeng (författare)
- Nanjing Univ, Peoples R China
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- Zhou, Huiqiong (författare)
- Natl Ctr Nanosci & Technol, Peoples R China
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- Zhang, Fengling (författare)
- Linköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska fakulteten
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- Zhang, Yuan (författare)
- Beihang Univ, Peoples R China
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(creator_code:org_t)
- ELSEVIER, 2020
- 2020
- Engelska.
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Ingår i: Nano Energy. - : ELSEVIER. - 2211-2855 .- 2211-3282. ; 75
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Fill factor (FF) is an important parameter governing the power conversion efficiency (PCE) in non-fullerene organic solar cells (NF-OSCs), which however is less studied than the other two parameters (short-circuit current J(sc) and open-circuit voltage V-oc). To understand how energy offsets, exciton and charge carrier dynamics impact the FF, four groups of bulk heterojunctions (BHJs) NF-OSCs are investigated with FFs varying from 0.61 to 0.78 under progressive changes of HOMO-HOMO offsets (Delta(HOMOs), from 0.09 to 0.24 eV). By pump-probe optical spectroscopy, we find that the FF exhibits a positive dependence on Delta(HOMO) and charge-separated state lifetime (tau(CS)) in the blends, a result of inhibited back charge transfers and recombination at the donor-acceptor interface under higher Delta(HOMO)s. Moreover, we observe a fast charge extraction with decreased sensitivity to internal electric-fields in high-FF devices. Despite these merits, the gains of FF are at the expense of increasing the voltage loss to non-radiative recombination in our studied systems. The combined results suggest that remaining appropriate energetic offsets is essential for controlling the carrier dynamics with longer-lived CS-states, restraining charge back transfer and reducing charge recombination toward high FFs and photovoltaic efficiencies.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Fill factor; HOMO energy offset; Voltage loss; Charge-separated state lifetime
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Zhang, Xuning
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Yao, Nannan
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Wang, Rui
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Li, Yanxun
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Zhang, Dongyang
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Wu, Guangbao
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visa fler...
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Zhou, Jiyu
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Li, Xing
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Zhang, Hong
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Zhang, Jianqi
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Wei, Zhixiang
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Zhang, Chunfeng
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Zhou, Huiqiong
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Zhang, Fengling
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Zhang, Yuan
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- NATURVETENSKAP
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Nano Energy
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