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Minority-carrier dynamics in semiconductors probed by two-photon microscopy



Benoit H. Gaury, Paul M. Haney


Two-photon time-resolved photoluminescence has been recently applied to various semiconductor devices to determine carrier lifetime and surface recombination velocities. So far the theoretical modeling activity has been mainly limited to the commonly used one-photon counterpart of the technique. Here we provide the analytical solution to a 3D diffusion equation that describes two-photon microscopy in the low-injection regime. We focus on a system with a single buried interface with enhanced recombination, and analyze how transport, bulk and surface recombinations influence photoluminescence decays. We find that bulk measurements are dominated by diffusion at short times and by bulk recombination at long times. Surface recombination modifies bulk signals when the optical spot is less than a diffusion length away from the probed interface. In addition, the resolution is increased as the spot size is reduced, which however makes the signal more sensitive to diffusion.
Proceedings Title
43rd Photovoltaic Specialists Conference
Conference Dates
June 5-10, 2016
Conference Location
Portland, OR, US


Gaury, B. and Haney, P. (2016), Minority-carrier dynamics in semiconductors probed by two-photon microscopy, 43rd Photovoltaic Specialists Conference, Portland, OR, US, [online],, (Accessed June 19, 2024)


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Created May 31, 2016, Updated April 6, 2022