Issue 32, 2015

Atomic layer deposition of transparent semiconducting oxide CuCrO2 thin films

Abstract

Atomic layer deposition (ALD) is a vital gas-phase technique for atomic-level thickness-controlled deposition of high-quality thin films on various substrate morphologies owing to its self-limiting gas–surface reaction mechanism. Here we report the ALD fabrication of thin films of the semiconducting CuCrO2 oxide that is a highly prospective candidate for transparent electronics applications. In our process, copper 2,2,6,6-tetramethyl-3,5-heptanedionate (Cu(thd)2) and chromium acetyl acetonate (Cr(acac)3) are used as the metal precursors and ozone as the oxygen source. Smooth and homogeneous thin films with an accurately controlled metal composition can be deposited in the temperature range of 240–270 °C; a post-deposition anneal at 700–950 °C in an Ar atmosphere then results in well crystalline films with a delafossite structure. Electrical transport measurements confirm the p-type semiconducting behavior of the films. The direct bandgap is determined from UV-vis spectrophotometric measurements to be 3.09 eV. The observed transmittance is greater than 75% in the visible range.

Graphical abstract: Atomic layer deposition of transparent semiconducting oxide CuCrO2 thin films

Article information

Article type
Paper
Submitted
15 May 2015
Accepted
11 Jul 2015
First published
13 Jul 2015

J. Mater. Chem. C, 2015,3, 8364-8371

Author version available

Atomic layer deposition of transparent semiconducting oxide CuCrO2 thin films

T. S. Tripathi, J. Niemelä and M. Karppinen, J. Mater. Chem. C, 2015, 3, 8364 DOI: 10.1039/C5TC01384D

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