Distinctive distribution of defects in CdZnTe:In ingots and their effects on the photoelectric properties

Abstract

Photoelectric properties of CdZnTe:In samples with distinctive defect distributions are investigated using various techniques. Samples cut from the head (T04) and tail (W02) regions of a crystal ingot show distinct differences in Te inclusion distribution. Obvious difference is not observed in Fourier transform infrared (FTIR) spectra, UV-Vis-NIR transmittance spectra, and I-V measurements. However, carrier mobility of the tip sample is higher than that of the tail according to the laser beam induced current (LBIC) measurements. Low temperature photoluminescence (PL) measurement presents sharp emission peaks of D 0 X and A 0 X, and relatively large peak of D 0 X (or A 0 X) / D complex for T04, indicating a better crystalline quality. Thermally stimulated current (TSC) spectrum shows higher density of shallow point defects, i.e., Cd vacancies, In + Cd , etc., in W02 sample, which could be responsible for the deterioration of electron mobility.

Nano Wave Plates Structuring and Index Matching in Transparent Hydroxyapatite‐YAG: Ce Composite Ceramics for High Luminous Efficiency White Light‐Emitting Diodes

“…As shown in Figure S1 (Supporting Information), with YAG: Ce ( n = 1.84) as the well‐acknowledged phosphor, ceramics such as AlN, YAG, Y 2 O 3 , Al 2 O 3 and HA ( n = 1.5–1.85) are proposed to be suitable matrix candidates in terms of refractive index matching. To ensure the transmittance, a high density and a uniform microstructure are needed, which can only be realized currently by extremely harsh and complicated processes, such as strong magnetic fields, ultrahigh temperature, and ultrahigh pressure . Unfortunately, these harsh sintering processes can cause severe damages to the embedded phosphors.…”

“…To ensure the transmittance, a high density and a uniform microstructure are needed, which can only be realized currently by extremely harsh and complicated processes, such as strong magnetic fields, ultrahigh temperature, and ultrahigh pressure. [24][25][26] Unfortunately, these harsh sintering processes can cause severe damages to the embedded phosphors. To save phosphors and achieve a high density, long time sintering is usually needed and leads to the base ceramics of a large grain structure.…”