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Improving the conductivity of sol–gel derived NiOx with a mixed oxide composite to realize over 80% fill factor in inverted planar perovskite solar cells

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Abstract

Charge extraction efficiency is one of the key factors to determine the performance of solar cells, which depends on the electronic properties of the electron and hole transporting layers. Sol–gel derived NiOx as the hole transporting layer (HTL) used in perovskite solar cells (PVSCs) promises both low-cost and high-stability. However, current NiOx based PVSCs have a relatively low fill factor (FF) and device efficiency. Here, we show that using an oxide composite approach by incorporating thermally reduced graphene oxide (rGO) into the NiOx layer (NiOx:rGO) can effectively improve the film conductivity without sacrificing its high work function. The improved charge extraction efficiency reduces the interfacial recombination loss and increases the carrier lifetime in NiOx:rGO based PVSCs, which are evidenced by transient photocurrent and transient photovoltage measurements. The NiOx:rGO based PVSC achieves a promising PCE of 19.1% with a significantly improved FF from 73% to 81% compared to the device using solely NiOx. Moreover, the NiOx:rGO based PVSC shows a decent photo-stability tracked at the maximum-power-point and a long shelf-lifetime with negligible degradation in device performance after 70 days. It is believed that the oxide composite transporting layer would be a promising alternative to further develop highly efficient and stable PVSCs.

Graphical abstract: Improving the conductivity of sol–gel derived NiOx with a mixed oxide composite to realize over 80% fill factor in inverted planar perovskite solar cells

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Publication details

The article was received on 09 Nov 2018, accepted on 14 Jan 2019 and first published on 16 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA10821H
Citation: J. Mater. Chem. A, 2019, Advance Article

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    Improving the conductivity of sol–gel derived NiOx with a mixed oxide composite to realize over 80% fill factor in inverted planar perovskite solar cells

    M. Li, X. Xu, Y. Xie, H. Li, Y. Ma, Y. Cheng and S. Tsang, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA10821H

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