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• W3202286535 startingPage "114970" @default.
• W3202286535 abstract "Quantum wells (QWs) are widely adopted in pn junctions to extend the cut-off wavelength for photodetection and solar energy conversion, in which the built-in electric field plays essential role in extracting the photo-carriers from QWs but inevitably affected by practical factors like the background doping. Herein, the carrier distribution and potential alignment in GaAs/InGaAs multi-quantum-well p-i-n photodiode were investigated by scanning capacitance microscopy (SCM) and Kelvin probe force microscopy (KPFM). Three of the five QWs were found injected by electrons with population density up to 7 × 1016 cm−3 in maximum according to the numerical simulation. The unintentionally doping concentration was estimated to be 5 × 1015 cm−3 in the absorption area, this led to a narrowed space charge region by 355 nm from expectation, which was well proved by the KPFM measurement. Nevertheless, the change of built-in potential could reach 0.577 V corresponding to a fairly high open-circuit voltage of the photodiode under illumination with modest intensity. Our study provides direct insight into p-i-n multi-quantum-well structures for high efficiency photoelectric conversion." @default.
• W3202286535 created "2021-10-11" @default.
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• W3202286535 date "2022-01-01" @default.
• W3202286535 modified "2023-10-16" @default.
• W3202286535 title "Retrieve the carrier population and built-in potential alignment in multi-quantum-well GaAs/InGaAs p-i-n photodiode" @default.
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• W3202286535 doi "https://doi.org/10.1016/j.physe.2021.114970" @default.
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