To study the influence of laser intensity and temperature on the performance of laser power converters (LPCs), a two-dimensional model of an In_0.3Ga_0.7As LPC by the finite element method was established. The validity of the model was verified by comparing the theoretical value with the experimental results. The factors that influence the performance of LPCs were analyzed from the perspective of recombination. Results indicate that the existence of grids at the front surface improves the collection of carriers efficiently, and the influence of temperature and laser intensity on carriers recombination is quite different at 0 and V_m (voltage at maximum power point) bias voltages. The research of this paper provides a reference for the optimization of LPCs.