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Issue 24, 2019
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Efficient perovskite solar cells with negligible hysteresis achieved by sol–gel-driven spinel nickel cobalt oxide thin films as the hole transport layer

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Abstract

Current–voltage hysteresis is a critical issue that impacts the photovoltaic performance of perovskite solar cells, and thus, it is imperative to develop high-efficiency perovskite solar cells without hysteresis behavior. Herein, we report the fabrication of efficient planar heterojunction perovskite solar cells employing solution-processed NiCo2O4 as the hole transport layer. The spinel NiCo2O4 thin film obtained via a sol–gel process exhibits high optical transparency, well-matched energy bands, smooth film morphology and decent electrical conductivity, much better than NiO, a typical hole transport layer for perovskite solar cells. We herein demonstrated that due to excellent hole extraction, transport, and collection properties of the solution-processed NiCo2O4, the device efficiency of up to 18.16% was achieved for the planar heterojunction perovskite solar cells. More importantly, the devices with NiCo2O4 as the HTL exhibited hysteresis-free behavior regardless of the voltage scan rate, which out-performed NiO-based devices.

Graphical abstract: Efficient perovskite solar cells with negligible hysteresis achieved by sol–gel-driven spinel nickel cobalt oxide thin films as the hole transport layer

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Supplementary files

Article information


Submitted
15 Feb 2019
Accepted
22 Apr 2019
First published
23 Apr 2019

J. Mater. Chem. C, 2019,7, 7288-7298
Article type
Paper

Efficient perovskite solar cells with negligible hysteresis achieved by sol–gel-driven spinel nickel cobalt oxide thin films as the hole transport layer

J. H. Lee, Y. W. Noh, I. S. Jin, S. H. Park and J. W. Jung, J. Mater. Chem. C, 2019, 7, 7288
DOI: 10.1039/C9TC00902G

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