Photoreflection spectrum on Si-surface-delta-doped GaAs

Wei Lu; Xingquan Liu; Xiaoshuang Chen; Guo Liang Shi; Yimin Qiao; Shuechu Shen; Ying Fu; Magnus Willander

doi:10.1117/12.344579

7 April 1999 Photoreflection spectrum on Si-surface-delta-doped GaAs

Wei Lu, Xingquan Liu, Xiaoshuang Chen, Guo Liang Shi, Yimin Qiao, Shuechu Shen, Ying Fu, Magnus Willander

Proceedings Volume 3629, Photodetectors: Materials and Devices IV; (1999) https://doi.org/10.1117/12.344579
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

In this paper we present the observation of the interband transition in the GaAs (100) surface Si-delta-doping potential. Samples with different surface doping concentrations (N_s equals undoped, 3.0 X 10¹², 6.3 X 10¹³, 2.4 X 10¹⁴ and 3.6 X 10⁴ cm^-2) have been studied at room temperature in the MBE high vacuum chamber using modulated photo-reflection (PR) spectroscopy technique. The MBE chamber guarantees that all the sample surfaces are free of oxidation or uncontrollable contamination. The optical transition of at GaAs bandedge around 1.41 eV is strong and is almost independent of N_s. A relatively weak feature above 1.42 eV has been observed which is clearly enhanced and blue-shifted following the increase of N_s. The experimental results have been analyzed and well explained based on the self-consistent Schrodinger-Poisson equations. The theoretical analysis indicates that it is not proper to attribute the PR spectral peak of 1.42 eV simply to be certain subband-related optical transition. The observed spectral peak of 1.42 eV is more likely to be related to the high-index confined-levels in the half-V-shape conduction band at the sample surface.

Citation Download Citation

Wei Lu, Xingquan Liu, Xiaoshuang Chen, Guo Liang Shi, Yimin Qiao, Shuechu Shen, Ying Fu, and Magnus Willander "Photoreflection spectrum on Si-surface-delta-doped GaAs", Proc. SPIE 3629, Photodetectors: Materials and Devices IV, (7 April 1999); https://doi.org/10.1117/12.344579

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