An Analytical Model of the Forward I– V Characteristics of 4H-SiC p-i-n Diodes Valid for a Wide Range of Temperature and Current

The forward I-V characteristics of 4H-SiC p-i-n diodes are studied in a wide range of currents and temperatures by means of an analytical model that allows us to highlight the minority current contributions in various diode regions, namely, the highly doped regions, the neutral base, and the space charge layer. By accounting for the doping dependence of various physical parameters, such as bandgap narrowing, incomplete doping activation, carrier lifetime, and mobility, the model turns useful to investigate the role of various material properties at different current levels and temperatures. The accuracy of the model is verified by comparisons with numerical simulations and experimental data in a wide range of currents and temperatures, so that this model turns very useful for better understanding the impact of technological parameters on the steady-state behavior of diodes and obtaining an accurate circuital model of diodes.