There is a uniform electric field in a semiconductor with a

There is a uniform electric field in a semiconductor with a magnitude of 1000 V/cm pointing from left to right. (a) Plot the conduction and valence band of the semiconductor in the presence of the electric field. (b) If an electron-hole pair is created at a point by shininga photon, in which direction will the electron hole move (do not forget that there is an E-field)?

Solution

*electric fileld is a vector and its direction is always away from +Ve charge and twords -Ve charge. so hole is moving along the field direction and electron is moving oposite to the field direction