Light-emitting element, light-emitting element array, exposure head, and image formation apparatus
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United States of America Patent
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Aug 28, 2017
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Aug 29, 2016
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Abstract
A light-emitting element includes, on a substrate, a shift thyristor and a light-emitting thyristor. The shift thyristor and the light-emitting thyristor each include a semiconductor multilayer structure consisting of first to fourth semiconductor layers stacked with alternating conductivity types. The shift thyristor includes a current diffusion layer in contact with the semiconductor multilayer structure, and a first metal electrode in this order, or the first metal electrode which is in contact with the semiconductor multilayer structure on the semiconductor multilayer structure; and wherein in the shift thyristor, a region in which a region in which the current diffusion layer or the first metal electrode and the semiconductor multilayer structure come into contact with each other is projected in a stacked direction of the semiconductor multilayer structure is included in a region in which the first metal electrode is projected in the stacked direction.
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