Axial distribution of deep-level defects in as-grown CdZnTe:In ingots and their effects on the material׳s electrical properties

Abstract

We investigated the distribution of deep-level defects in CdZnTe:In ingots along the growth direction using thermally stimulated current (TSC) spectra. Higher concentration of Te antisite-related deep donors were found in the tail region due to Te enrichment in the melt as solidification proceeds. The compensation between Cd In  defects and Cd vacancies results in low concentration of net free electrons. High resistivity with n-type conduction was demonstrated from the I-V analysis. Hall mobility is lower in the tail due to higher concentration of Te antisite-related deep donors.

Determination of Defect Levels in Melt-Grown All-Inorganic Perovskite CsPbBr3 Crystals by Thermally Stimulated Current Spectra

“…The simultaneous multiple peak analysis (SIMPA) method was introduced to resolve the TSC spectra for a full characterization of defect levels. − Defect-related parameters thermal activation energy ( E T i ), effectively collected charge ( Q T i ), initial defect density ( N T i ), defect-dependent coefficient ( D t i ), and capture cross section (σ n i ) were obtained by eqs –. , Details of mathematical analysis are described in Supporting Information section 2. The point defects in melt-grown CsPbBr 3 crystals were determined by combining the SIMPA fitting results of TSC spectra with the analysis of the distribution of elements.…”

Laser-induced increase of resistivity and improvement of optical properties of CdZnTe crystal

“…As shown by Xu et al [16] the compensation of V Cd by In Cd leads to a low concentration of free electrons. This effect leads to the increase resistivity of CdZnTe crystal.…”

Enhancement of Resistivity of CdZnTe Crystal by Laser Radiation

“…In a general case, In atoms can occupy V Cd in CdZnTe and it exists in form of donor-like ion In Cd . In turn, this leads to the decrease of mobility and to increase in resistivity [14,15]. This effect is explained by the thermogradient effect [10,11,16].…”