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Issue 38, 2015
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Low-cost solution-processed copper iodide as an alternative to PEDOT:PSS hole transport layer for efficient and stable inverted planar heterojunction perovskite solar cells

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Abstract

Inverted planar heterojunction (PHJ) perovskite solar cells have attracted great attention due to their advantage of low-temperature fabrication on flexible substrates by solution processing with high efficiency. Poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) is the most widely used hole transport layer (HTL) in inverted PHJ perovskite solar cells; however, the acidic and hygroscopic nature of PEDOT:PSS can cause degradation and reduce the device stability. In this work, we demonstrated that low-cost solution-processed hydrophobic copper iodide (CuI) can serve as a HTL to replace PEDOT:PSS in inverted PHJ perovskite solar cells with high performance and enhanced device stability. A power conversion efficiency (PCE) of 13.58% was achieved by employing CuI as the HTL, slightly exceeding the PEDOT:PSS based device with a PCE of 13.28% under the same experimental conditions. Furthermore, the CuI based devices exhibited better air stability than PEDOT:PSS based devices. The results indicate that low-cost solution-processed CuI is a promising alternative to the PEDOT:PSS HTL and could be widely used in inverted PHJ perovskite solar cells.

Graphical abstract: Low-cost solution-processed copper iodide as an alternative to PEDOT:PSS hole transport layer for efficient and stable inverted planar heterojunction perovskite solar cells

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Publication details

The article was received on 13 Jul 2015, accepted on 17 Aug 2015 and first published on 18 Aug 2015


Article type: Paper
DOI: 10.1039/C5TA05286F
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J. Mater. Chem. A, 2015,3, 19353-19359

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    Low-cost solution-processed copper iodide as an alternative to PEDOT:PSS hole transport layer for efficient and stable inverted planar heterojunction perovskite solar cells

    W. Chen, L. Deng, S. Dai, X. Wang, C. Tian, X. Zhan, S. Xie, R. Huang and L. Zheng, J. Mater. Chem. A, 2015, 3, 19353
    DOI: 10.1039/C5TA05286F

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