THE SHAPE OF CURRENT-VOLTAGE CHARACTERISTICS OF SOLAR CELLS

摘要

By proper integration of Poisson and transport equations, considering the junction boundary conditions, current-voltage characteristics of a wide variety of shapes are obtained. The shape depends critically on these boundary con¬ditions and on material properties. In turn, deviation from the ideal charac¬teristic can be used to determine several material properties of a photo¬voltaic device. It is possible to categorize deviation from the ideal diode behaviour and use simple approximations to obtain defect level distribution, interface recombination velocity and critical fields for field related junction effects. This discussion augments the previous model using a resistive network to alter characteristics and modifies the model using diodes of different A-factors in the exponent. It assists in analyzing less than perfect solar cells to obtain directions for possible improvements.