Which processes are responsible for the charge carrier transport in a semiconductor? Which of these govern in the case of a bulk semiconductor when no potential is applied?

In a semiconductor, charge carrier transport is primarily governed by two processes: drift and diffusion.

1. Drift occurs when charge carriers (electrons or holes) move due to the presence of an electric field. The carriers experience a force in the direction _______ ___ _________ _________ ___ ______ _____.
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