increases gradually with the decrease of I,,, and also becomes higher with increasing of temperat'ure. Linearity ( y = 1) is sometimes observed only a t sufficiently high I,,, above 10l6 quanta x x s-l. A phenomenological theoretical model is proposed which accounts for non-radiative surface recombination and non-uniform spatial distribution of the excited carriers and provides satisfactory qualitative agreement with the experimental findings.
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