Temperature dependence of the electron spin resonance spectra of a coal-derived vacuum distillation residue and components

1987 ◽  
Vol 59 (13) ◽  
pp. 1726-1731 ◽  
Author(s):  
Salvatore M. Castellano ◽  
William P. Chisholm ◽  
Richard F. Sprecher ◽  
Herbert L. Retcofsky
Keyword(s):  
Electron Spin Resonance ◽  
Temperature Dependence ◽  
Electron Spin ◽  
Vacuum Distillation ◽  
Distillation Residue ◽  
Spin Resonance ◽  
Vacuum Distillation Residue

The First Fifty Billion Nanoseconds of Electron Photocarrier Evolution in Undoped a-Si:H

1990 ◽  
Vol 192 ◽  
Author(s):  
Homer Antoniadis ◽  
E.A. Schiff
Keyword(s):  
Electron Spin Resonance ◽  
Steady State ◽  
Temperature Dependence ◽  
Conduction Band ◽  
Electron Spin ◽  
Charge Collection ◽  
Spin Resonance ◽  
Emission Time ◽  
The Mean

ABSTRACTThe drift of electrons generated by a 3 ns illumination impulse was studied in several undoped a-Si:H specimens by using transient photocharge measurements from 10 ns to 50 sec. The transients show four stages of evolution: band transport, deep-trapping and subsequent re-emission, and recombination. From the temperature dependence of the emission time we estimated the mean energy of the trap distribution and the attempt-to-escape frequency associated with this trap to be 0.6 eV below the conduction band and 5×1012 sec−1 respectively; this trap has been identified in previous work with the D-center found in electron spin resonance. In addition the data resolve the two orders of magnitute discrepancy between mobility-lifetime estimates from earlier charge-collection experiments and from steady-state photoconductivity.

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