Comparison of some theoretical models for fittings of the temperature dependence of the fundamental energy gap in GaAs


Autoria(s): MORAIS, R. R. O.; DIAS, I. F. L.; DUARTE, J. L.; LAURETO, E.; LOURENÇO, S. A.; Silva, Euzi Conceicao Fernandes da; Quivy, Alain Andre
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

26/03/2012

26/03/2012

2010

Resumo

In this work we report on a comparison of some theoretical models usually used to fit the dependence on temperature of the fundamental energy gap of semiconductor materials. We used in our investigations the theoretical models of Viña, Pässler-p and Pässler-ρ to fit several sets of experimental data, available in the literature for the energy gap of GaAs in the temperature range from 12 to 974 K. Performing several fittings for different values of the upper limit of the analyzed temperature range (Tmax), we were able to follow in a systematic way the evolution of the fitting parameters up to the limit of high temperatures and make a comparison between the zero-point values obtained from the different models by extrapolating the linear dependence of the gaps at high T to T = 0 K and that determined by the dependence of the gap on isotope mass. Using experimental data measured by absorption spectroscopy, we observed the non-linear behavior of Eg(T) of GaAs for T > ΘD.

Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)

CNPq

Identificador

Brazilian Journal of Physics, v.40, n.1, p.15-21, 2010

0103-9733

http://producao.usp.br/handle/BDPI/11930

10.1590/S0103-97332010000100003

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332010000100003

http://www.scielo.br/pdf/bjp/v40n1/a03v40n1.pdf

Idioma(s)

eng

Publicador

Sociedade Brasileira de Física

Relação

Brazilian Journal of Physics

Direitos

openAccess

Copyright Sociedade Brasileira de Física

Palavras-Chave #Non-linear behavior of Eg(T) #Zero-point energy #Temperature dependence of the gap #Gallium arsenide
Tipo

article

original article

publishedVersion