Type ii quantum dot solar cells

A technology of quantum dots and quantum states, applied in the field of photosensitive optoelectronic devices, can solve the problem that photoconductor cells do not have rectifier junctions, etc.

Inactive Publication Date: 2010-12-29
RGT UNIV OF MICHIGAN +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Photoconductor cells do not have rectifying junctions and typically operate without bias

Method used

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  • Type ii quantum dot solar cells
  • Type ii quantum dot solar cells
  • Type ii quantum dot solar cells

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Embodiment Construction

[0031] One method under investigation for increasing the efficiency of solar cells is to use quantum dots to create an intermediate band in the bandgap of the solar cell. Quantum dots confine charge carriers (electrons, holes and / or excitons) in three dimensions to discrete quantum energy states. The cross-sectional dimension of each quantum dot is typically on the order of hundreds of angstroms or less.

[0032] figure 1 An example of a quantum dot solar cell device is shown. The device comprises a first contact (electrode) 110 , a first transition layer 115 , a plurality of quantum dots 130 embedded in a semiconductor bulk matrix material 120 , a second transition layer 150 and a second contact (electrode) 155 .

[0033] In devices made of inorganic materials, one transition layer (115, 150) may be p-type and the other transition layer n-type. Bulk matrix material 120 and quantum dots 130 may be intrinsic (undoped). The interface between the transition layers 115, 150 an...

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Abstract

A device comprises a plurality of fence layers of a semiconductor material and a plurality of alternating layers of quantum dots of a second semiconductor material embedded between and in direct contact with a third semiconductor material disposed in a stack between a p-type and n-type semiconductor material. Each quantum dot of the second semiconductor material and the third semiconductor material form a heterojunction having a type Il band alignment. A method for fabricating such a device is also provided.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Patent Application Serial No. 11 / 869,954, filed October 10, 2007, and entitled "Type II QuantumDot Solar Cells," the entire contents of which are hereby incorporated by reference. [0003] US government rights [0004] This invention was made with US Government support under a contract awarded by the US Department of Energy's National Renewable Energy Laboratory. The US Government has certain rights in this invention. [0005] Collaborative Research Agreement [0006] Portions of the claimed invention were made pursuant to a University-Industry Collaborative Research Agreement by, on behalf of, and / or in association with one or more of the following parties: Princeton University, University of Southern California and Global Photonic Energy Corporation. Pursuant to a University-Industry Cooperative Research Agreement, the remainder of the claimed invention was made by, on behalf of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0352H01L31/072H01L31/18
CPCY10S977/948Y10S977/932H01L31/03046B82Y30/00Y02E10/544H01L31/035281H01L31/0735H01L31/03845
Inventor 史蒂芬·R·福里斯特韦国丹徐崑庭
Owner RGT UNIV OF MICHIGAN
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