Time delay at photovoltaic parameters determination for high power laser converters

In this work GaAs photovoltaic converters for high-power laser radiation were investigated in high optical pumping conditions. Radiative heating of the sample under test can be avoided by reducing the duty cycle of the illumination pulses. This work discusses the application boundaries of such a research method. The barrier and diffusion capacitance of photovoltaic converters are discussed. These parameters affect the leading edge of the photoresponse. In high irradiation conditions the diffusion component is crucial especially in open circuit mode. Capacitive effects can also appear in photocurrent studying if there is resistance in measuring circuits and irradiation is high.