Photoreflectance and photoluminescence spectroscopy of low-temperature GaAs grown by molecular-beam epitaxy

被引：7
|
作者：
Sinha, S [1 ]
Arora, BM [1 ]
Subramanian, S [1 ]
机构：
[1] OREGON STATE UNIV,DEPT ELECT & COMP ENGN,CORVALLIS,OR 97331
来源：
JOURNAL OF APPLIED PHYSICS | 1996年 / 79卷 / 01期
关键词：
D O I：
10.1063/1.360848
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Photoreflectance (PR) and photoluminescence (PL) measurements have been carried out on low-temperature GaAs (LT GaAs) and LT-GaAs/AlGaAs modulation-doped photodetector (MODPD) structures grown by molecular-beam epitaxy. Samples with LT GaAs grown at 350 degrees C show several PL lines associated with (i) transitions involving two-dimensional electron gas in LT GaAs near the interface, (ii) band-edge transitions in the bulk LT GaAs, and (iii) transitions involving deep level defect complexes in LT GaAs. In addition a PL emission band at 1.65 eV observed in all the MODPD structures is attributed to a crossover transition at the LT-GaAs/AlGaAs interface. PR spectra of these modulation-doped structures show Franz-Keldysh oscillations which are attributed to high electric fields (> 10(5) V/cm) at the LT-GaAs/AlGaAs interface. PR measurements on bare LT-GaAs layers suggest that the Eo transition in LT GaAs is about 20 meV above that of the normal GaAs E(o) gap. (C) 1996 American Institute of Physics.
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页码：427 / 432
页数：6
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