Work-function tuneable and aqueous solution-processed Cs2CO3 for high-performance polymer solar cells

Mei-Feng Xu; Ying-Jie Liao; Feng-Shuo Zu; Jian Liang; Da-Xing Yuan; Zhao-Kui Wang; Liang-Sheng Liao

doi:10.1039/C4TA01441C

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Work-function tuneable and aqueous solution-processed Cs₂CO₃ for high-performance polymer solar cells†

Mei-Feng Xu,^a Ying-Jie Liao,^b Feng-Shuo Zu,^a Jian Liang,^a Da-Xing Yuan,^a Zhao-Kui Wang*^a and Liang-Sheng Liao*^a

Author affiliations

* Corresponding authors

^a Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123, China
E-mail: zkwang@suda.edu.cn, lsliao@suda.edu.cn

^b College of Electronic Engineering, Jiujiang University, Jiujiang 332005, China

Abstract

The authors demonstrate an aqueous solution-processed Cs₂CO₃ thin film with an adjustable work function via MoO₃ and/or Na₂WO₄ doping. The doped Cs₂CO₃ as a cathode interfacial layer is successfully used in poly(3-hexyl-thiophene) (P3HT)/indene-C₆₀ bisadduct (IC₆₀BA) heterojunction based solar cells with improved open-circuit voltage and unaffected short-circuit current density. X-ray photoelectron spectroscopy (XPS) evaluation was conducted to verify the formation of the new composites of W–O–Cs and Mo–O–Cs after doping of MoO₃ and/or Na₂WO₄ into Cs₂CO₃. The change of the work function of MoO₃- and/or Na₂WO₄-doped Cs₂CO₃ was further confirmed by ultraviolet photoelectron spectroscopy (UPS) measurements.

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Article information

DOI: https://doi.org/10.1039/C4TA01441C
Article type: Paper
Submitted: 26 Mar 2014
Accepted: 08 Apr 2014
First published: 08 Apr 2014

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J. Mater. Chem. A, 2014,2, 9400-9404

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Work-function tuneable and aqueous solution-processed Cs₂CO₃ for high-performance polymer solar cells

M. Xu, Y. Liao, F. Zu, J. Liang, D. Yuan, Z. Wang and L. Liao, J. Mater. Chem. A, 2014, 2, 9400 DOI: 10.1039/C4TA01441C

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Journal of Materials Chemistry A