IR Absorption of OH and OD Centres and OH/OH, OD/OD, and OH/OD Complexes in Cu‐Doped ZnO Single Crystals

Abstract

With ZnO:Cu:H, ZnO:Cu:D, and ZnO:Cu:H:D IR‐active absorption line spectra composed of 20 absorption bands are observed. Regarding the values of the absorption coefficients one of the 20 absorption bands is prominent (“main peak”), 18 absorption bands lie on the high energy side of the main peak (“side bands”). Measurements with the main peaks and the side bands are represented.

Uniaxial stress study of the Cu–H complex in ZnO

“…The purpose of this study is to probe the microscopic properties of the Cu-H defect by means of uniaxial stress. In particular, we show that in addition to the main stretching mode at 3192 cm 1 -the defect has two low energy excitations with energy quanta of 25 and 49 cm 1 -.…”

“…In close agreement with experiment, theoretical values of the stretch LVM and dissociation energy were found to be 3087 cm 1 -and 1.9 eV, respectively. Additionally, two wagging modes of hydrogen at 768 and 846 cm 1 -and a pseudo-LVM of Cu below 100 cm 1 -were predicted. The purpose of this study is to probe the microscopic properties of the Cu-H defect by means of uniaxial stress.…”

“…Hydrogen is a common impurity in ZnO that strongly influences the electrical and optical properties via formation of defect complexes with impurities and native defects [1][2][3][4][5][6][7][8][9].…”

“…For example, substitutional Cu -often present in as-grown ZnO -can readily trap hydrogen, resulting in a number of Cu n -H m complexes [1,2]. Of main interest for this paper is the Cu-H center which dominates the Cu n -H m series.…”

“…At temperatures above 50 K at least one more broad absorption line appears in the spectra 'blue'-shifted from the main peak by 22 cm 1 -. The nature of this line was not discussed [1,2].…”