Photoconversion device with enhanced photon absorption

a technology of photon absorption and conversion device, which is applied in the field of photoconversion device, can solve the problems of in-situ tunability of absorption spectrum of devices, and none of these technologies have enabled the conversion of absorbed light into electrical signals
US20130193404A1Active Publication Date: 2013-08-01FUNDACIO INST DE CIENCIES FOT NIQUES
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
FUNDACIO INST DE CIENCIES FOT NIQUES
Publication Date
2013-08-01

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Abstract

An infrared photoconversion device comprising a collector with at least an active layer made of a single sheet of doped single-layer, bilayer, or multilayer graphene patterned as nanodisks or nanoribbons. The single sheet of doped graphene presents high absorbance and thus, the efficiency of devices such as photovoltaic cells, photodetectors, and light emission devices can be improved by using graphene as the central absorbing or emitting element. These devices become tunable because their peak absorption or emission wavelength is changed via electrostatic doping of the graphene.
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Description

TECHNICAL FIELD

[0001] The present invention relates to photoconversion devices such as photovoltaic cells, photodetectors and light sources.BACKGROUND OF INVENTION

[0002] Light absorption plays a central role in optical detectors and photovoltaics. Inspired by nature, two different routes have been investigated to achieve perfect absorption. A first one consists in relying on diffusion in disordered lossy surfaces (e.g., black silver and carbon). Engineered materials have been synthesized following this solution to produce extraordinary broadband light absorption (e.g., dense arrays of carbon nanotubes). A second approach consists in using ordered periodic structures, as found in some nocturnal insects, where they produce the moth eye effect. This alternative has been pioneered by experimental and theoretical work showing total light absorption (TLA) in the visible using metallic gratings. In this context, the Salisbury screen (U.S. Pat. No. 2,599,944 B1), consisting of a thin absorbin...

Claims

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