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Polymers 2018, 10(2), 127; https://doi.org/10.3390/polym10020127

Inverted Organic Solar Cells with Low-Temperature Al-Doped-ZnO Electron Transport Layer Processed from Aqueous Solution

1
Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory, School of Microelectronics, Xidian University, Xi’an 710071, China
2
Shaanxi Joint Key Laboratory of Graphene, Xidian University, Xi’an 710071, China
*
Authors to whom correspondence should be addressed.
Received: 20 December 2017 / Revised: 26 January 2018 / Accepted: 26 January 2018 / Published: 28 January 2018
(This article belongs to the Special Issue Polymer Solar Cells)
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Abstract

The aqueous-based Zn-ammine complex solutions represent one of the most promising routes to obtain the ZnO electron transport layer (ETL) at a low temperature in inverted organic solar cells (OSCs). However, to dope the ZnO film processed from the Zn-ammine complex solutions is difficult since the introduction of metal ions into the Zn-ammine complex is a nontrivial process as ammonium hydroxide tends to precipitate metal salts due to acid-base neutralization reactions. In this paper, we investigate the inverted OSCs with Al-doped-ZnO ETL made by immersion of metallic Al into the Zn-ammine precursor solution. The effects of ZnO layer with different immersion time of Al on film properties and solar cell performance have been studied. The results show that, with the Al-doped-ZnO ETL, an improvement of the device performance could be obtained compared with the device with the un-doped ZnO ETL. The improved device performance is attributed to the enhancement of charge carrier mobility leading to a decreased charge carrier recombination and improved charge collection efficiency. The fabricated thin film transistors with the same ZnO or AZO films confirm the improved electrical characteristics of the Al doped ZnO film. View Full-Text
Keywords: organic solar cell; inverted structure; electron transport layer; Al-doped-ZnO organic solar cell; inverted structure; electron transport layer; Al-doped-ZnO
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhang, Q.; Peng, R.; Zhang, C.; Chen, D.; Lin, Z.; Chang, J.; Zhang, J.; Hao, Y. Inverted Organic Solar Cells with Low-Temperature Al-Doped-ZnO Electron Transport Layer Processed from Aqueous Solution. Polymers 2018, 10, 127.

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