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Issue 22, 2017
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Low-temperature solution-processed NiOx films for air-stable perovskite solar cells

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Abstract

The use of organic hole transporting layers (HTLs) in organolead halide perovskite solar cells (PSCs) often limits the air and thermal stability of the devices. In this work, we developed a low-temperature solution process that enables the fabrication of nickel oxide (NiOx) based HTLs on top of perovskite active layers. The NiOx film exhibits a uniform and dense morphology, rendering the PSCs air-stable and thermally stable. We further found that by introducing an interfacial layer (e.g. CuSCN) between the NiOx film and the top metal electrode, the power conversion efficiency (PCE) of the PSCs can be largely improved from 10.4% to 17.2%, while the air stability continues to be excellent. The role of the interfacial layer was investigated through impedance analysis and ultraviolet photoelectron spectroscopy. Remarkably, the PSCs with the NiOx/CuSCN hybrid inorganic HTL exhibit no degradation in their PCE after being exposed to ambient air (humidity level: 50–60%) for 4 months without encapsulation.

Graphical abstract: Low-temperature solution-processed NiOx films for air-stable perovskite solar cells

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Publication details

The article was received on 13 Mar 2017, accepted on 03 May 2017 and first published on 04 May 2017


Article type: Paper
DOI: 10.1039/C7TA02228J
Citation: J. Mater. Chem. A, 2017,5, 11071-11077
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    Low-temperature solution-processed NiOx films for air-stable perovskite solar cells

    J. Cao, H. Yu, S. Zhou, M. Qin, T. Lau, X. Lu, N. Zhao and C. Wong, J. Mater. Chem. A, 2017, 5, 11071
    DOI: 10.1039/C7TA02228J

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