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Durham e-Theses
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Trapping effects in Cds devices

Robertson, Michael J. (1980) Trapping effects in Cds devices. Doctoral thesis, Durham University.



In order to study the possible effect of interface states on the efficiency of the CdS/Cu(_2)S heterojunction solar cell, the simpler structure of metal-on-insulator-on-CdS has been investigated. It has proved impossible to apply the theories appropriate to MIS devices on silicon, mainly because of the difficulties of producing a uniform oxide layer. However, a hypothesis has been put forward which is consistent with the experimental observations and which may be applicable to other results reported in the literature. The use of a scanning electron microscope (S.E.M.) particularly in the induced current mode, has allowed complementary investigations of surface properties to be carried out. The chemical preparation of a copper sulphide layer on CdS under different conditions is described and the various phases of Cu(_x)S produced are identified. The optical and electronic properties of these devices have been investigated under two-beam illumination to excite trapping effects. Further use of the S.E.M. with these structures has shown how useful this instrument can be in the analysis of semiconductor junctions. Finally, a number of conclusions relevant to the production of a more efficient cell are presented and a modified band structure model of the heterojunction is proposed.

Item Type:Thesis (Doctoral)
Award:Doctor of Philosophy
Thesis Date:1980
Copyright:Copyright of this thesis is held by the author
Deposited On:15 Jul 2013 14:42

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