| 摘要 |
<p>A semiconductor device for an original reader having a switching element such as a diode, an optical sensor element comprising a photoelectric conversion element and a switching element, and a switching element used in an image reader for inputting image information in a facsimile apparatus, an image scanner, and the like. In a semiconductor device (90) provided with a semiconductor element (blocking diode) (94) having a switching function and comprising a lower electrode (94a), a semiconductor layer (94b), an upper electrode (94c), all of which are formed vertically in this order; at least either one of the lower electrode (94a) and the upper electrode (94c) consists of one or more layers, and out of the conductive layers at least the one which is in contact with the semiconductor layer (94b) is transparent. An optical sensor element and an original document reader according to the present invention employ such semiconductor devices having switching function. In such a semiconductor device thus structured, the reverse direction current involved in switching elements such as blocking diodes and in optical sensor elements can be reduced, making it possible to enhance the switching speed, and to obtain exact signal output from the optical sensor element. Further, in an original document reader having these switching elements or optical sensor elements, inverted residual images can be reduced, and at the same time, the reading can be executed at a higher speed.</p> |
