McKay, K.G.; A Germanium Counter
Phys. Rev. 76 (1949) 1537;
When insulating crystals, such as diamonds, are used as crystal counters of nuclear particles, a complicating factor is the trapping of mobile charge carriers in the crystal. This results in a broad pulse height distribution and the development of internal space charge fields. These effects can be greatly minimized for bombarding particles of high specific ionization by using a very thin crystal together with a high electric field. A method of obtaining the equivalent of this is to use a barrier
layer in a semiconductor. The properties of the barrier layer in germanium under a point contact are such that one can calculate under what circumstances it could be used as a counter. (Extracted from the introductory part of the paper.).
Accelerator Detectors SEMI
Related references See also J. Bardeen and W. H. Brattain, Phys. Rev. 74 (1948) 230;
W. Shockley, G. L. Pearson, and M. Sparks, Phys. Rev. 76 (1949) 180;
J. A. Becker and J. N. Shive, Elec. Eng. 68 (1949) 215;
Invention of semi-conductor detectors.