The exciton and edge emissions in CdTe crystals

Photoluminescence analysis of Cd0.8Mn0.2Te single crystal grown by the vertical Bridgman method

“…The main PL line is assigned to the recombination of excitons bound to the neutral acceptors, which denoted by (A 0 , X). The intensity of the (A 0 , X) drastically decreases upon annealing under Cd-saturated atmosphere, which suggest that the (A 0 , X) line maybe related to the recombination of excitons trapped at Cd vacancies complex [18]. The parameters of the PL spectrum of CMT at 10 K shows that the (A 0 , X) peak centers at 1.8836 eV, the DAP peak centers at 1.7932 eV, the full width at half maximum (FWHM) of the (A 0 , X) peak AX is 10.7 meV, and the intensity ratio of the DAP peak and the (A 0 , X) peak defined as the defect radiative density is 0.081.…”

Gamma-radiation effect on donor and acceptor states in CdTe and CdTe:Cl

“…According to [4,5], V Cd -2Cl Te acceptors participate in these transitions. The intensity of the LO-phonon replicas of the zero-phonon line (ZPL) follows the Poisson distribution I n ∼ e −S (S n /n!…”

Cathodoluminescence investigations on CdTe and Cd0.96Zn0.04Te crystals

“…[4][5][6]) and is observed as the dominant emission in almost all as-grown undoped p-type CdTe crystals. The acceptor has been identified with impurities like Cu, Na and Ag [4].…”

“…The acceptor has been identified with impurities like Cu, Na and Ag [4]. But more recent studies [5,6] on samples subjected to annealing under Cd atmosphere indicate that these acceptors maybe related to Cd vacancies. Seto et al [5] and Shin and Sun [6] argue that this strong (A 0 ,X) emission line located at 1.589 eV, is associated with a complex acceptor composed of Cd vacancy-donor complex.…”

“…Refs. [6,7]) to as the first LO phonon replica of the free exciton emission (which occurs at 1.599 eV in CdTe), and the 1.554 eV emission is considered as the primary free electron-to-bound acceptor (eA 0 ) transition despite earlier works of Espinosa et al [8] and Bryant et al [9] pointing to the free-to-bound character of the 1.576 eV emission.…”