An underestimated photoactive area in organic solar cells based on a ZnO interlayer

Chen, Zhi; Wang, Jie; Jin, Hui; Yang, Jianming; Bao, Qinye; Ma, Zaifei; Tress, Wolfgang; Tang, Zheng

doi:10.1039/D1TC00745A

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	An underestimated photoactive area in organic solar cells based on a ZnO interlayer
Authors:	Chen, Zhi Wang, Jie Jin, Hui Yang, Jianming Bao, Qinye Ma, Zaifei Tress, Wolfgang Tang, Zheng
et. al:	No
DOI:	10.1039/D1TC00745A
Published in:	Journal of Materials Chemistry C
Volume(Issue):	9
Issue:	35
Page(s):	11753
Pages to:	11760
Issue Date:	2021
Publisher / Ed. Institution:	Royal Society of Chemistry
ISSN:	2050-7526 2050-7534
Language:	English
Subject (DDC):	621.3: Electrical, communications, control engineering
Abstract:	Solution-processed ZnO is commonly used as a charge-selective interlayer between an absorber and electrode in organic solar cells. In this work, the impact of the resistance of the sol–gel grown ZnO interlayer on solar cell performance is investigated. We find that the UV-induced doping effect leads to a significantly reduced ZnO resistance, which gives rise to an underestimated photoactive area and thus overestimated short-circuit current density (Jsc) for the solar cell measured without an aperture. Moreover, we show that this so far mostly overlooked issue can be unintentionally triggered during common fabrication and characterization processes, because the UV photons flux from a solar simulator, or from a light source for encapsulating the solar cell, are already sufficient in leading to the too much increased lateral conductivity of the ZnO. Finally, we demonstrate that interlayers with rather high sheet resistance can lead to an overestimation of Jsc (e.g. by 10% for a 10 MΩ per square interlayer in a 2 mm2 device). Therefore, the validity of the argument that high-resistance interlayers do not lead to overestimated Jsc should always be carefully evaluated.
URI:	https://digitalcollection.zhaw.ch/handle/11475/22618
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Computational Physics (ICP)
Appears in collections:	Publikationen School of Engineering

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Chen, Z., Wang, J., Jin, H., Yang, J., Bao, Q., Ma, Z., Tress, W., & Tang, Z. (2021). An underestimated photoactive area in organic solar cells based on a ZnO interlayer. Journal of Materials Chemistry C, 9(35), 11753–11760. https://doi.org/10.1039/D1TC00745A

Chen, Z. et al. (2021) ‘An underestimated photoactive area in organic solar cells based on a ZnO interlayer’, Journal of Materials Chemistry C, 9(35), pp. 11753–11760. Available at: https://doi.org/10.1039/D1TC00745A.

Z. Chen et al., “An underestimated photoactive area in organic solar cells based on a ZnO interlayer,” Journal of Materials Chemistry C, vol. 9, no. 35, pp. 11753–11760, 2021, doi: 10.1039/D1TC00745A.

CHEN, Zhi, Jie WANG, Hui JIN, Jianming YANG, Qinye BAO, Zaifei MA, Wolfgang TRESS und Zheng TANG, 2021. An underestimated photoactive area in organic solar cells based on a ZnO interlayer. Journal of Materials Chemistry C. 2021. Bd. 9, Nr. 35, S. 11753–11760. DOI 10.1039/D1TC00745A

Chen, Zhi, Jie Wang, Hui Jin, Jianming Yang, Qinye Bao, Zaifei Ma, Wolfgang Tress, and Zheng Tang. 2021. “An Underestimated Photoactive Area in Organic Solar Cells Based on a ZnO Interlayer.” Journal of Materials Chemistry C 9 (35): 11753–60. https://doi.org/10.1039/D1TC00745A.

Chen, Zhi, et al. “An Underestimated Photoactive Area in Organic Solar Cells Based on a ZnO Interlayer.” Journal of Materials Chemistry C, vol. 9, no. 35, 2021, pp. 11753–60, https://doi.org/10.1039/D1TC00745A.