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

Dunlap-Shohl, Wiley A.; Daunis, Trey B.; Wang, Xiaoming; Wang, Jian; Zhang, Boya; Barrera, Diego; Yan, Yanfa; Hsu, Julia W. P.; Mitzi, David B.

doi:10.1039/C7TA09494A

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

Journal Article · Mon Dec 04 00:00:00 EST 2017 · Journal of Materials Chemistry. A

DOI:https://doi.org/10.1039/C7TA09494A· OSTI ID:1593914

^[1]; Daunis, Trey B. ^[2]; Wang, Xiaoming ^[3];

^[4]; Zhang, Boya ^[2]; Barrera, Diego ^[2];

^[3];

^[2];

^[1]

Duke Univ., Durham, NC (United States)
Univ. of Texas at Dallas, Richardson, TX (United States)
Univ. of Toledo, OH (United States)
Univ. of Texas at Dallas, Richardson, TX (United States); Univ. of Washington, Seattle, WA (United States)

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. Here, 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. Finally, solar cells made using these films exhibit stabilized power conversion efficiencies exceeding 14%, with only minor hysteresis in the current–voltage characteristics.

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Research Organization:: Duke Univ., Durham, NC (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0006712; AC02-05CH11231

OSTI ID:: 1593914

Journal Information:: Journal of Materials Chemistry. A, Vol. 6, Issue 2; ISSN 2050-7488

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 78 works

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