Electrical Conduction in Amorphous Trinitro - Nine - Fluorenone and Selenium
| dc.contributor.author | Abebe, Mekonnen | |
| dc.date.accessioned | 2018-06-28T12:09:22Z | |
| dc.date.accessioned | 2023-11-09T11:23:58Z | |
| dc.date.available | 2018-06-28T12:09:22Z | |
| dc.date.available | 2023-11-09T11:23:58Z | |
| dc.date.issued | 1992-06 | |
| dc.description.abstract | The theories of electronic structures in amorphous semiconductors are reviewed. The effectiveness of the study of electrical conductions particularly the SCLC, TSC and transient photoconductivity, in providing a wealth of information on electronic properties of disordered solids also discussed. Analytic equations describing the above three conduction properties are also developed. Experimental study of the SCLC, TSC and transient photoconductivity is made fora_TNF and a-Se. Distinctly from the models that are based on the assum~ tions of discrete or uniform distributions of traps in energy, our experimental works on a~TNF and a-Se indicate the existence of energetically dispersed charge carriers trapping states. The observed space charge limited mode of conduction and its temperature sensitivity is found to be best describable interms of a smoothly varying distributions. The Gaussian distribution seems more realistic for the interpretation of experimental results in a~TNF and a~e. Both hopping and multiple trapping models are used in interpreting the transient photo-conductivity experimental results for a-TNF and a.,.Se respectively. Drift mobilities of charge carriers are seen to exhibit an activated nature and also found to be field dependent in a manner similar to the poole~Frenkel mechanism. For an explanation of the dispersive hole transport in a-Se interms of the multiple trapping model, the theoretical predictions developed on the basis of a Gaussian distribution is found to agree with experimental results more satisfactorily. The study of thermally stimulated current characteristics in a-TNF near the glass transition temperature, Tg, renders an activation energy which is significantly different from results of low temperature TSC analysis. Rather, it is nearly identical to the zero field extrapolated activation energy computed from transient photo conductivity experiments. There by indicates this energy parameters to contain the disorder induced term | en_US |
| dc.identifier.uri | http://10.90.10.223:4000/handle/123456789/4668 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Electrical Conduction in Amorphous | en_US |
| dc.title | Electrical Conduction in Amorphous Trinitro - Nine - Fluorenone and Selenium | en_US |
| dc.type | Thesis | en_US |