Characteristics of p-GaAs/p-AlxGa1-xAs/si-GaAs studied by surface photovoltage

Cui Fan; X. L. Chen; G. Ch. Jiao; C. L. Hu; Y. Sh. Qian

doi:10.1117/12.2001135

20 November 2012 Characteristics of p-GaAs/p-Al_xGa_1-xAs/si-GaAs studied by surface photovoltage

Cui Fan, X. L. Chen, G. Ch. Jiao, C. L. Hu, Y. Sh. Qian

Proceedings Volume 8564, Nanophotonics and Micro/Nano Optics; 856423 (2012) https://doi.org/10.1117/12.2001135
Event: Photonics Asia, 2012, Beijing, China

Abstract

A comparative study of semi-insulating GaAs substrate, p-Al_xGa_1-x As/ semi-insulating GaAs and p-GaAs/p-Al_xGa_1-xAs/ semi-insulating GaAs structure has been done using the surface photovoltage (SPV) spectroscopy in metal–insulator–semiconductor (MIS) configuration. Which space charge region (SCR) dominated contribution to SPV in a certain wavelength range was determined. The SPV signals were calculated in a similar way as the open circuit voltage of an illuminated photodiode. One-dimensional continuity equations was adopted for determine the distribution of excess minority carrier. The ideality factor of MIS configuration was investigated in air ambient. The contributions for SPV signal of different layers were discussed in detail. At last the minority carrier diffusion length of different layers and surface or interface recombination velocity were simulated.

Citation Download Citation

Cui Fan, X. L. Chen, G. Ch. Jiao, C. L. Hu, and Y. Sh. Qian "Characteristics of p-GaAs/p-Al_xGa_1-xAs/si-GaAs studied by surface photovoltage", Proc. SPIE 8564, Nanophotonics and Micro/Nano Optics, 856423 (20 November 2012); https://doi.org/10.1117/12.2001135

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