Graduate Thesis Or Dissertation
 

Investigation of electric field-induced optical absorption changed in CdS

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/g732dc53x

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  • The feasibility of using the Franz-Keldysh effect in practical light intensity controlling devices was investigated. Reverse-biased diodes made from CdS were implemented to obtain high electric fields necessary for the effect. The three types of diodes studies were: MIS, metal-semiconductor barrier, and p⁺-n heterojunction. An expression for the change in transmitted light intensities of the devices was derived in terms of the maximum electric fields in the space-charge regions. This expression was used to generate the calculated curves. The changes in optical transmission spectra under the influence of applied voltages for both polarized and unpolarized incident light were presented. Changes in optical transmission of the order of one percent were observed for applied maximum electric field of 5 x 10⁴ V/cm. Qualitative and quantitative comparisons of experimental results with theoretical predictions were made. With the present technology, the maximum electric field the devices could withstand was approximately 10⁵ V/cm. Several suggestions were made for possible improvement in the breakdown voltages of the devices.
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