A Review of Research on the Conductivity Mechanism and Performance Effects of N-type and P-type Doping in Silicon Materials

Abstract

Due to the extremely limited number of electrons that cross its band gap at room temperature, it is unsuitable for direct application in semiconductors and other electronic devices. However, its conductivity can be altered through effective doping. This paper analyzes the impact of n-type and p-type doping on the cond uctivity of pure silicon. In n-type doping, the majority carriers are free electrons, while in p-type doping, they are holes. The former increases conductivity by adding free electrons, while the latter increases the hole concentration. Although the princi ples differ, the effects are similar; both hybridization methods can increase carrier concentration by several orders of magnitude. To further improve conductivity, heavy doping can be achieved by scientifically increasing carrier concentration. Conversely , deep-level impurities can have a compensating effect, reducing conductivity. The limitations of this paper are: the cited literature primarily focuses on bulk silicon and nanowires/nanotubes, with insufficient discussion of doping behavior at the nanoscale; and most experimental studies lack direct, systematic comparisons of n-type and p-type doping under identical conditions. Future research could delve deeper into areas such as systematic comparisons of carrier mobilities, synergistic effects of co-doping, and the application of novel doping techniques, such as self-assembled monolayers, in ultra-shallow junctions.