Concerning the depletion width of a radial 𝑝-𝑛 junction and its influence on electrical properties of the diode

Abstract

Dependences of the depletion widths in a radial core-shell 𝑝-𝑛 diode on the radius of the metallurgical boundary of the 𝑝-𝑛 junction have been studied theoretically in detail. While the depletion width of the core increases with decreasing radius, the depletion width of the shell, on the contrary, decreases. This is the consequence of the cylindrical symmetry of the structure. The total depletion width of the 𝑝-𝑛 junction can both increase and decrease depending on the doping levels of the core and shell. A number of cases are presented where the dependence of depletion width of the 𝑝-𝑛 junction on its curvature influences the diode current-voltage characteristics.