Hot-Carrier Model for an Anomalous Exponent of Photoconduction - Condensed Matter > Other Condensed MatterReportar como inadecuado




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Abstract: Experiments often show that the photoconductance $\sigma$ of a semiconductorsystem and the light intensity $I$ are related by $\sigma\sim I^\gamma$.Conventional theories give a satisfactory explanation for $\gamma=1$ or$\gamma=1-2$, but anamalous exponents close to $\gamma=3-4$ are often observed.This paper argues that there is a universal anomalous regime for which$\gamma=3-4$ or $\gamma=2-3$ in two-dimensional samples, resulting from thekinetics of electron-hole recombination being controlled by Coulombicattraction. Because the local electric fields are extremely high, the theoryappeals to the -hot-carrier- model for transport in semiconductors.



Autor: Michael Wilkinson

Fuente: https://arxiv.org/







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