AN IMAGING DEVICE COMPRISING AN AMX3 ORGANOMETALLIC PEROVSKITE MATERIAL

IP.com Disclosure Number: IPCOM000246242D
Publication Date: 2016-May-19

Document File: 2 page(s) / 37K

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Abstract

An imaging device that includes perovskite material is disclosed. The imaging device includes a substrate, a thin film transistor (TFT) array and a photodiode. The photodiode includes an AMX3-type (perovskite) material. In particular, the perovskite material is an AMX3-type organometallic perovskite material. The imaging device may be used for medical applications, industrial X-ray inspection applications, and non-destructive X-ray inspection.

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Undisclosed

Language

English (United States)

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This is the abbreviated version, containing approximately 53% of the total text.

AN IMAGING DEVICE COMPRISING AN AMX₃ ORGANOMETALLIC PEROVSKITE MATERIAL

BACKGROUND

The present invention relates generally to imaging devices and more particularly to an imaging device with improved quantum efficiency.

Generally, photodiodes are made of either inorganic semiconductors, such as, silicon, Germanium, Indium gallium arsenide, and Lead sulfide, Cadmium telluride (CdTe), among others, or organic semiconductors, such as, one that is based on a blend of regioregular poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM), among others.

A conventional photodiode employs a perovskite oxide, such as, Strontium titanate (SrTiO3). The photodiode includes Titanium dioxide (TiO₂) nanocrystalline film that is prepared on SrTiO₃ substrate to form an n-n heterojunction active layer. Interdigitated gold (Au) electrodes are deposited on top of TiO₂ film to fabricate a modified heterojunction metal-semiconductor-metal (HMSM) ultraviolet photodetector. The TiO₂/SrTiO₃ heterojunction finds excellent application in fabricating high performance UV photodetectors.

Other conventional solar cells are made of organometallic perovskite, in particular, methylammonium lead halide (CH₃NH₃PbX₃), where X represents a halogen, such as, chlorine (Cl), bromine (Br), or iodine (I), or methylammonium tin iodide (CH₃NH₃SnI₃). While solar cells are generally optimized to maximize charge extraction under irradiation, photodiodes are required to minimize dark current, which likely require one or two blocking layers and are usually operated under bias.

However, quantum efficiency of the conventional photodiodes and solar cells is reduced due to optical losses, such as, transmission and reflection.

Therefore, it would be desirable to have an imaging device that includes a photodiode with improved quantum efficiency.

DETAILED DESCRIPTION

An imaging device that includes a perovskite material is disclosed. The imaging device includes a substrate, a thin film transistor (TFT) array and a photodiode. The photodiode includes an AMX₃-type (perovskite) material, wherein A inclu...