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Photovoltaic devices with high-aspect-ratio nanostructures

A nanostructure, high aspect ratio technology, applied in the field of nanotechnology, can solve the problems of low conversion efficiency, reluctance to choose, etc.

Inactive Publication Date: 2013-01-23
GLOBALFOUNDRIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For most applications, such a low conversion efficiency makes people reluctant to choose conventional photovoltaic cells

Method used

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  • Photovoltaic devices with high-aspect-ratio nanostructures
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  • Photovoltaic devices with high-aspect-ratio nanostructures

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example

[0049] The method is further illustrated by reference to the following non-limiting examples.

[0050] Nanowire photovoltaic cells based on Schottky junctions: An n-doped Si substrate was coated with a three millimeter (mm) thick layer of Au using thermal evaporation of Au. Next, the wafer is placed in a CVD chamber, and in hydrogen (H 2 ) with an airflow of 200 standard cubic centimeters per minute (sccm), heated to 550°C. As a result, Au forms islands on the surface of the Si substrate to a pH of 50 sccm which acts as a doping precursor (i.e., will be converted to a dopant later during nanowire growth). 3 In the presence of 50sccm SiH 4 When the gas flow is introduced into the CVD chamber, the Si nanowires are preferentially nucleated. Then, nanowires are grown using VLS-CVD. After growing the nanowires, any remaining Au was removed using an iodine-based etchant type TFA (manufacturing company: Transene Company, Danvers, MA). The native silicon dioxide (SiO 2 ) layer (...

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Abstract

Photovoltaic devices and techniques for enhancing efficiency thereof are provided. In one aspect, a photovoltaic device is provided. The photovoltaic device comprises a photocell having a first photoactive layer and a second photoactive layer adjacent to the first photoactive layer so as to form a heterojunction between the first photoactive layer and the second photoactive layer; and a plurality of high-aspect-ratio nanostructures on one or more surfaces of the second photoactive layer. The plurality of high-aspect-ratio nanostructures are configured to act as a scattering media for incident light. The plurality of high-aspect-ratio nanostructures can also be configured to create an optical resonance effect in the incident light.

Description

technical field [0001] The present invention relates to the use of nanotechnology in photovoltaic devices, and more particularly to the use of nanostructures to enhance the light absorption and efficiency of photovoltaic devices. Background technique [0002] Photovoltaic devices, such as photovoltaic cells, are an important energy source that has hitherto been underutilized for general energy generation. Photovoltaic cells generate electrical energy by converting photons from a light source into electricity (eg, by releasing electron-hole pairs). But conventional photovoltaic cells typically provide light-to-electricity conversion efficiencies of only about 25 percent. For most applications, such low conversion efficiencies make conventional photovoltaics an undesirable option. [0003] Attempts have been made to increase the energy conversion efficiency of photovoltaic devices by incorporating nanowires, nanocrystals, etc. into the active layer of the device using nanote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0352H01L31/052H01L31/072H01L31/18
CPCH01L31/072H01L31/035281Y02E10/52H01L31/0522H01L31/1884H01L31/0216B82Y20/00Y02E10/50
Inventor S·古哈O·古纳万
Owner GLOBALFOUNDRIES INC