Abstract
Abstract Photogeneration properties and optical absorption of a series of amorphous Se 1− y Te y samples ( y ⩽ 0.18) are investigated. The photodetection efficiency has been determined as a function of field strength and photon energy. Results are found to be described rather well by the Onsager mechanism of photogeneration. From fitting the Onsager relation to the experimental results the initial electron-hole pair separation was found as a function of photon energy and Te concentration. It was found that with increasing Te concentration, i.e. decreasing “band gap”, the initial pair separation increases. The experimental results indicate that this increase may be due to a change in some characteristic energy parameter. From a comparison of the results of photogeneration measurements and optical absorption measurements it is concluded that this energy parameter is not the optical gap.
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