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Issue 5, 2018
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An integrated organic–inorganic hole transport layer for efficient and stable perovskite solar cells

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Abstract

Certified power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) have increased to an impressive value of 22.1%. The most efficient perovskite solar cells have the n–i–p device architecture and use 2,2′,7,7′-tetrakis(N,N′-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) as the hole transport material (HTM). However, there exists microscopic inhomogeneity that is detrimental to the long-term performance of the solar cells, primarily as a result of the hygroscopicity of the lithium bis((trifluomethyl)sulfonyl)amide (LiTFSI) dopant. Here, we report a strategy for reducing heterogeneity by using an organic–inorganic integrated hole transport layer (HTL) composed of the solution-processable conjugated polymer FBT-Th4 and copper oxide (CuxO). The optimized PSCs show significant performance enhancement with power conversion efficiency up to 18.85% from a reverse voltage scan and a stabilized champion efficiency of 18.24% with negligible hysteresis. Moreover, we observe a significant enhancement of the long-term stability of perovskite solar cells under a high humidity of 70–80% in air.

Graphical abstract: An integrated organic–inorganic hole transport layer for efficient and stable perovskite solar cells

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Publication details

The article was received on 11 Nov 2017, accepted on 02 Jan 2018 and first published on 02 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA09946K
Citation: J. Mater. Chem. A, 2018,6, 2157-2165
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    An integrated organic–inorganic hole transport layer for efficient and stable perovskite solar cells

    Y. Guo, H. Lei, L. Xiong, B. Li and G. Fang, J. Mater. Chem. A, 2018, 6, 2157
    DOI: 10.1039/C7TA09946K

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