Visual motion of electrons above. In a semiconductor with unequal sides in temperature by moving to a lower temperature. Best electric current will flow in the opposite direction.
The movement of electrons in a majority. In semiconductors with temperature sides are equal by moving to a lower temperature. The electrons flow in the opposite direction.
The image motion of electrons, daily. In a semiconductor with two sides equal temperature by moving to a low temperature. The electric current will flow in the opposite direction.