DIRECT BANDGAP SUBSTRATES AND METHODS OF MAKING AND USING
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Accused Products
Abstract
An indirect bandgap thin film semiconductor circuit can be combined with a compound semiconductor LED such as to provide an active matrix LED array that can have high luminous capabilities such as for a light projector application. In another example, a highly efficient optical detector is achievable through the combination of indirect and direct bandgap semiconductors. Applications can include display technologies, light detection, MEMS, chemical sensors, or piezoelectric systems. An LED array can provide structured illumination, such as for a light and pattern source for projection displays, such as without requiting spatial light modulation (SLM). An example can combine light from separate monolithic light projector chips, such as providing different component colors. An example can provide full color from a single monolithic light projector chip, such as including selectively deposited phosphors, such as to contribute individual component colors to an overall color of a pixel.
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Citations
22 Claims
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1. (canceled)
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2. A method comprising:
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providing an inorganic substrate with a substantially direct bandgap for light emission or absorption, including forming a metal contact to the substrate; forming an insulating layer on a first side of the substrate; forming a direct bandgap semiconductor layer on the insulating layer; selectively heating and crystallizing an active region of the direct bandgap semiconductor layer formed on the insulating layer; forming an electrical contact to the crystallized active region in the direct bandgap semiconductor layer; and forming an electrical contact o the substrate. - View Dependent Claims (3, 4, 5, 6)
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7. A method comprising:
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providing an inorganic substrate with a substantially direct bandgap for light emission or absorption, including forming a metal contact to the substrate; forming an insulating layer on a first side of the substrate; forming an indirect bandgap semiconductor layer on the insulating layer; selectively heating and crystallizing an active region of the direct bandgap semiconductor layer formed on the insulating layer; forming an electrical contact to the crystallized active region in the direct bandgap semiconductor layer; and forming an electrical contact to the substrate. - View Dependent Claims (8, 9, 10, 11)
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12. An apparatus comprising:
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an inorganic light emitting or absorbing device formed from an inorganic substrate providing a substantially direct bandgap for light emission or absorption, including a metal contact formed on the substrate; an insulating layer on a first side of the substrate; a direct bandgap semiconductor layer on the insulating layer; a thin film semiconductor circuit, in the direct bandgap semiconductor layer, the semiconductor circuit comprising a selectively heated and crystallized polycrystalline grain semiconductor active region; and an electrical connection, through the insulating layer, electrically connecting the inorganic light emitting or absorbing device with the thin film semiconductor circuit. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An apparatus comprising:
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an inorganic light emitting or absorbing device formed from an inorganic substrate providing a substantially direct bandgap for light emission or absorption; an insulating layer on a first side of the substrate; an indirect bandgap semiconductor layer on the insulating layer; a thin film semiconductor circuit, in the indirect bandgap semiconductor layer, the semiconductor circuit comprising a selectively melted and crystallized polycrystalline grain semiconductor active region; and an electrical connection, through the insulating layer, electrically connecting the inorganic light emitting or absorbing device with the thin film semiconductor circuit. - View Dependent Claims (19, 20, 21, 22)
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Specification