Temperature dependence of absorption edge in MOCVD grown GaN
Temperature dependence of absorption edge in MOCVD grown GaN
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MOCVD 生长的 GaN 吸收边缘的温度依赖性
DOI:
10.1007/s10854-007-9295-4
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发表时间:
2007-05
期刊:
影响因子:
--
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中科院分区:
文献类型:
--
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We have studied the temperature dependence of absorption edge of GaN thin films grown on sapphire substrate by metal-organic chemical vapor deposition using optical absorption spectroscopy. A shift in absorption edge of about 55 meV has been observed in temperature range 273–343 K. We have proposed a theoretical model to find the energy gap from absorption coefficient using α = αmax+ (αmin− αmax)/[1 + exp 2(E − Eg+ KT)/KT]. Temperature dependence of band gap has also been studied by finding an appropriate theoretical fit to our data using Eg(T) = Eg(273 K) − (8.8 × 10−4T2)/(483 + T) + 0.088 (Varshni empirical formula) and Eg(T) = Eg(273 K)−0.231447/[exp(362/T)−1] + 0.082 relations. It has been found that data can be fitted accurately after adding a factor ∼0.08 in above equations. Debye temperature (483 K) and Einstein temperature (362 K) in the respective equations are found mutually in good agreement.
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影响因子:
1.2
作者:
A. Manoogian;J. Woolley
通讯作者:
A. Manoogian;J. Woolley
影响因子:
4
作者:
Muth, JF;Lee, JH;DenBaars, SP
通讯作者:
DenBaars, SP
影响因子:
--
作者:
VARSHNI, YP
通讯作者:
VARSHNI, YP
影响因子:
3.2
作者:
D. C. Reynolds;J. Hoelscher;C. Litton;T. Collins
通讯作者:
D. C. Reynolds;J. Hoelscher;C. Litton;T. Collins
影响因子:
4
作者:
NAKAMURA, S;SENOH, M;NAGAHAMA, S
通讯作者:
NAGAHAMA, S