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베허남제이날반드파르진,Lee DongKun,김근형,하재두,Kim Jong Su,Kim Yeongho,Lee Sang Jun 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.7
A formulation was derived to connect the time constant of the photorefectance signal and the quantum efciency of a p-n junction. The characteristic time constants were achieved by the phase diagram of the photorefectance spectra. An explicit formulation of the characteristic time constant of the junction is then derived. In this semi-empirical formula, the characteristic time constant is related to the photovoltage, the excitation wavelength, the intensity, the permittivity, the depletion width, and, most importantly, the quantum efciency. Two structures comprising p-n and p-i-n GaAs junctions were examined, and the quantum efciency of the junctions was estimated by the method for diferent excitation wavelengths. The proposed formulation can predict the wavelength dependency of the quantum efciency for GaAs-based junctions and that the quantum efciency of a p-i-n structure is higher than the p-n structure, as expected from the literature. This work can be regarded as an investigation to connect the photorefectance spectroscopy to the quantum efciency in the junctions. Moreover, it can be used as a simple tool to fnd a more physical meaning for the time constant.