INVESTIGATION OF CHARGE TRANSPORT AND CARRIER GENERATION IN CDS.
Abstract
An investigation has been made of the electron transport in CdS crystals and its relation to the green edge emission. Mobility measurements, using previously described techniques, showed that in some crystals the electron drift mobility is controlled predominatly by a level of centres lying 0.15 ev below the conduction band. In such specimens the room temperature value of Mu sub e is less than 1/10 of that observed in the more common type of crystal where shallower levels (0.03 - 0.04 ev below epsilon) are the controlling centres. Low mobility crystals are showed strong green luminescence (edge emission) under u.v. excitation at 77 K. Moderate heat treatment (below 400 C) quenched the luminescence and also led to a large increase in Mu sub e. This suggested at the time that the 0.15 ev level might be connected with the luminescent process, particularly as its energetic position was close to that expected for such a centre. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1963
- Accession Number
- AD0426141
Entities
People
- Walter Eric Spear
Organizations
- University of Leicester