论文信息 - Solid-liquid phase transitions in CdTe crystals under pulsed laser irradiation

Solid-liquid phase transitions in CdTe crystals under pulsed laser irradiation

Phase transitions in CdTe crystals irradiated with nanosecond KrF (248 nm) excimer laser pulses were investigated by a numerical simulation and time-resolved reflectivity method. By solving the time-dependent heat flow equation and taking into account the temperature dependences of semiconductor parameters, the time dependence of the surface temperature in a CdTe crystal was calculated as a function of laser pulse intensity. The dynamics of laser-induced melting was directly monitored by measurements of the reflection coefficient of a probe laser beam (532 nm). The melting and ablation thresholds have been determined as 2.5 and 7.3 MW/cm2, respectively.

[1] J. Stuchlík,et al. Dynamics of the excimer laser annealing of hydrogenated amorphous silicon thin films , 1999 .

[2] Toru Aoki,et al. Influence of laser irradiation and laser-induced In doping on the photoluminescence of CdTe crystals , 2003 .

[3] J. Zinck,et al. Reversible modification of CdTe surface composition by excimer laser irradiation , 1990 .

[4] Toru Aoki,et al. Excimer laser doping techniques for II-VI semiconductors , 2001 .

[5] Yoshinori Hatanaka,et al. Generation of the A-centres at the surface of CdTe(Cl) by YAG:Nd laser radiation , 2002 .

[6] M. M. Jevitć,et al. Melting and solidification in laser-irradiated HgCdTe , 1991 .

[7] L. Golovan,et al. Evaporation effect on laser induced solid–liquid phase transitions in CdTe and HgCdTe , 1998 .

[8] Toru Aoki,et al. Surface state of CdTe crystals irradiated by KrF excimer laser pulses near the melting threshold , 2003 .