| Abstract: | In the present paper, we report the results of experiments carried out to determine the effect of surface states on the work function of intrinsic, germanium crystals. This investigation is realised by using the Thermionic Emission Theory at the intrinsic temperature range T (from 900 to 1050 K). The “apparent work function” φ1, obtained from the experimental ln(isT2) versus 1/T curves, is found different from the Richardson-Dushman equation one: “the true work fucntion” φ. This difference is mainly due to the work function and electron reflection coefficient dependence on temperature. φ is deduced from φ1 and from RD modified equation taking into account the semiconductor case. The value of φ varies with T: from 3.97 to 4.16 eV. These results are compared with those obtained, by several authors, using other techniques. We present an analysis of these results taking into consideration the effect of surface states shifts on the surface barrier height, and on the work function consequently. |
