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Ethanedithiol Treatment of Solution-Processed ZnO Thin Films: Controlling the Intragap States of Electron Transporting Interlayers for Efficient and Stable Inverted Organic Photovoltaics

Bai, Sai (author)
Zhejiang University, Peoples R China; Zhejiang University, Peoples R China
Jin, Yizheng (author)
Zhejiang University, Peoples R China; Zhejiang University, Peoples R China
Liang, Xiaoyong (author)
Zhejiang University, Peoples R China; Zhejiang University, Peoples R China
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Ye, Zhizhen (author)
Zhejiang University, Peoples R China; Zhejiang University, Peoples R China
Wu, Zhongwei (author)
Soochow University, Peoples R China
Sun, Baoquan (author)
Soochow University, Peoples R China
Ma, Zaifei (author)
Linköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska högskolan
Tang, Zheng (author)
Linköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska högskolan
Wang, Jianpu (author)
Nanjing Technical University, Peoples R China
Wuerfel, Uli (author)
Fraunhofer Institute Solar Energy Syst ISE, Germany; University of Freiburg, Germany
Gao, Feng (author)
Linköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska högskolan
Zhang, Fengling (author)
Linköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska högskolan
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 (creator_code:org_t)
2014-11-22
2015
English.
In: Advanced Energy Materials. - : Wiley-VCH Verlag. - 1614-6832 .- 1614-6840. ; 5:5, s. 1401606-
Related links:
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The surface defects of solution-processed ZnO films lead to various intragap states. When the solution-processed ZnO films are used as electron transport interlayers (ETLs) in inverted organic solar cells, the intragap states act as interfacial recombination centers for photogenerated charges and thereby degrade the device performance. Here, a simple passivation method based on ethanedithiol (EDT) treatment is demonstrated, which effectively removes the surface defects of the ZnO nanocrystal films by forming zinc ethanedithiolates. The passivation by EDT treatment modulates the intragap states of the ZnO films and introduces a new intragap band. When the EDT-treated ZnO nanocrystal films are used as ETLs in inverted organic solar cells, both the power conversion efficiency and stability of the devices are improved. The control studies show that the solar cells with EDT-treated ZnO films exhibit reduced charge recombination rates and enhanced charge extraction properties. These features are consistent with the fact that the modulation of the intragap states results in reduction of interfacial recombination as well as the improved charge selectivity and electron transport properties of the ETLs. It is further demonstrated that the EDT treatment-based passivation method can be extended to ZnO films deposited from sol-gel precursors.

Subject headings

NATURVETENSKAP  -- Biologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Keyword

electron transporting interlayers; intragap states; molecular passivation; organic solar cells; ZnO thin films

Publication and Content Type

ref (subject category)
art (subject category)

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