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Issue 2, 2018
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Room-temperature fabrication of a delafossite CuCrO2 hole transport layer for perovskite solar cells

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Abstract

Delafossite oxides are promising hole transport layer (HTL) candidates for perovskite solar cells, due to their wide band gap, favorable energy band alignment relative to the perovskite absorber and simplicity of processing. In this paper, we investigate the properties of CuCrO2 (CCO) delafossite films using an integration of experimental and computational techniques. Phase-pure CCO films are deposited at room temperature by spin-casting suspensions of hydrothermally-synthesized nanoparticles, for use in a glass/ITO/CCO/CH3NH3PbI3/C60/BCP/Ag device structure. Although density functional theory (DFT) calculations predict an elevated hole effective mass along certain crystallographic directions, the nearly isotropic shape and small size of the CCO nanoparticles preserves transport properties within the films by randomizing particle orientation, preventing these unfavorable directions from dominating the film conductivity. Experimental measurements confirm that the CCO films display appropriate optical and electrical properties for use as an HTL, in good agreement with the DFT calculations. Solar cells made using these films exhibit stabilized power conversion efficiencies exceeding 14%, with only minor hysteresis in the current–voltage characteristics.

Graphical abstract: Room-temperature fabrication of a delafossite CuCrO2 hole transport layer for perovskite solar cells

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Supplementary files

Article information


Submitted
27 Oct 2017
Accepted
01 Dec 2017
First published
04 Dec 2017

J. Mater. Chem. A, 2018,6, 469-477
Article type
Paper

Room-temperature fabrication of a delafossite CuCrO2 hole transport layer for perovskite solar cells

W. A. Dunlap-Shohl, T. B. Daunis, X. Wang, J. Wang, B. Zhang, D. Barrera, Y. Yan, Julia W. P. Hsu and D. B. Mitzi, J. Mater. Chem. A, 2018, 6, 469
DOI: 10.1039/C7TA09494A

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