Photoluminescence of Cd-rich Hg1−xCdxTe alloys (0.7<x<1)

Photoluminescence Studies of HgCdTe Epilayers

“…At higher temperatures, the peak energy follows the bandgap evolution. 9 This again confirms the attribution of this peak to the band-to-band transition. The ME peak attributed to a D°-h transition disappears above 40 K, probably because of ionization of the donor.…”

“…2c shows that the high-energy peak emitting at 513 meV at 2 K becomes dominant above 45 K, even in the case of the annealed sample, and follows the same behavior as the high-energy peak of sample A (unintentionally doped); i.e., localization into Urbach states is seen below 120 K. For higher temperatures, the peak center energy follows the bandgap variation. 9 Thus, this peak is attributed to the band-to-band transition. However, in the case of the as-grown sample, another emission at higher energy is seen above 40 K. Above this temperature, two peaks with band-to-band spectral shape are needed to fit the PL spectra.…”

“…8 For higher temperatures, the temperature dependence of the position of the peaks follows the theoretical bandgap versus temperature dependence. 9 Thus, this emission probably corresponds to a band-toband transition. In addition, this emission is well fitted by the spectral shape I PL ðEÞ ¼ ðE À E g Þ 1=2 exp ÀðE À E g Þ= Â ðk B TÞ; corresponding to a band-toband emission.…”

Infrared Photoluminescence in Narrow-Gap Semiconductors

“…Combinations of IR-PL data and E,(x, T ) relations were reported, too: In [66] X-ray microprobe investigations were compared with IR-PL data using empirical E,(x, T ) relations. In [72] the authors developed their own empirical relation for the interpretation of the spectral positions in their spectra.…”

Defect related luminescence in Hg0.2Cd0.8Te nano- and micro-crystals grown by the solvothermal method

“…The spectra show that the band gap of the sample is around 1.1 eV while the absorption onset is at 1 eV. According to Legros and Triboulet [14] the band gap calculated corresponding to this composition of Hg 1 À x Cd x Te is 1.12 eV indicating that the expected composition of MCT is preserved in the samples. The basic PL behavior of MCT nano-and microcrystals is demonstrated in Fig.…”