Addition of an insulating element to the Modified Markov Method for CdTe single crystals growth

Abstract

CdTe single crystal, were grown by the Modified Markov Method. We have introduced an insulating element between the furnace and the growth chamber, trying to minimize the radiation effects in the crystal. Numerical simulation of the heat transfer phenomena predict a reduction of the axial temperature gradient in the growth chamber, confirming by numerical experimental measurements, leading to a more uniform growth. An improvement in the surface morphology and in the crystal quality as well was achieved, evaluated by the combination of X-ray rocking curves, etch pit density determination and low temperature photoluminescence.

Numerical analysis of heat transfer for the modified markov method

“…It is also remarkable that the temperature increase inside the growth chamber near the seed (almost 30ºC from the one without insulating element to the C insulating element), while decrease slightly neat the porous dish. These results can be compared with experimental ones [12] and consistence between them will be found.…”

“…3a that the calculated profile behaves on a similar way to the experimental one. The main difference is the shift on temperatures on the simulated profile that makes a bigger temperature gradient on the theoretical than in the experimental one (29.6K/cm for the numerical profile and 20.5K/cm for the experimental one) [12]. These differences, about 1% of the total temperature range, should be related with the simplifications assumed in the model, i.e.…”

“…The first solution we obtained was the one without insulating element, in order to test our model and compare with the experimental results [12]. Fig.…”

Heat transfer—A review of 2004 literature

“…Other studies involve microgravity [JM135], crystal interface [JM136], Bridgman growth [JM137], Czochralski growth [JM67,, FZ growth [JM143], floating crystal growth [JM144], traveling solvent method (TSM) [JM145], modified Markov method [JM146] and LEC growth [JM147]. Heat transfer in scraped eutectic crystallizers was also studied [JM148].…”