4.6 Article

Low temperature processed ternary oxide as an electron transport layer for efficient and stable perovskite solar cells

Journal

ELECTROCHIMICA ACTA
Volume 261, Issue -, Pages 474-481

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.12.182

Keywords

Mg-doped ZnO; PCBM; Planar perovskite solar cells; Electron transport material; Long term stability

Funding

  1. National Natural Science Foundation of China [51572098, 51272080]
  2. Fund for Strategy Emerging Industries of Shenzhen [JCY20150630155150208]
  3. Open Fund of State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology [2016-KF-5]
  4. Technology innovation fund project of Huazhong University of Science and Technology Innovation Research College

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In this paper, high efficient and stable planar perovskite solar cells (PKSCs) have been designed and fabricated via employing high transparent Mg-doped ZnO films with excellent electron transport ability as a novel class of electron transport layers (ETLs). Due to the optimized band alignment by Mg doping, the photogenerated electron injection and charge extraction from the perovskite film to ETL have been facilitated effectively and the planar PKSC based on 2% Mg-doped ZnO and MAPbI(3) yields the maximum power conversion efficiency (PCE) of up to 16.74%. Meanwhile, a higher PCE of 17.85% through a phenyl C-60 butyric acid methyl ester (PCBM) interfacial layer between the 2% Mg-doped ZnO and perovksite layer has been achieved for the first time. Moreover, the PKSCs with 2% Mg-doped ZnO/PCBM composite ETLs also demonstrate outstanding long term device stability and up to 91% of original PCE of the PKSCs, which can be retained even after exposure in ambient conditions over three-months. (c) 2018 Elsevier Ltd. All rights reserved.

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