Elsevier

Sensors and Actuators

Volume 3, 1982–1983, Pages 283-291
Sensors and Actuators

Thin film cdS0.6Se0.4:Cu photoresistor linear array for document analysis

https://doi.org/10.1016/0250-6874(82)80028-0Get rights and content

Abstract

Charge-coupled devices (CCD) can be used for facsimile document analysis. An alternative possibility is the use of an electronically scanned linear array of photoresistors. A 1728-element array is suitable for the analysis of an ISO A4-format document with a resolution comparable to that given by the most perfect mechanical procedures, yet at a much faster rate. This paper describes a new method for the deposition of a photoconductive thin film, obtained by coevaporation and annealing of CdS0.6Se0.4:Cu. It also describes a new technique for fabricating the array, so that the semiconductor film is protected during the various processing steps. The 72 mm-long prototypes, with 8 photodetectors per mm, can be easily juxtaposed in order to increase the length of the linear array and allow the analysis of an A4 (or larger) format.

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