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Title: Thin film photovoltaic devices with a minimally conductive buffer layer

A thin film photovoltaic device (100) with a tunable, minimally conductive buffer (128) layer is provided. The photovoltaic device (100) may include a back contact (150), a transparent front contact stack (120), and an absorber (140) positioned between the front contact stack (120) and the back contact (150). The front contact stack (120) may include a low resistivity transparent conductive oxide (TCO) layer (124) and a buffer layer (128) that is proximate to the absorber layer (140). The photovoltaic device (100) may also include a window layer (130) between the buffer layer (128) and the absorber (140). In some cases, the buffer layer (128) is minimally conductive, with its resistivity being tunable, and the buffer layer (128) may be formed as an alloy from a host oxide and a high-permittivity oxide. The high-permittivity oxide may further be chosen to have a bandgap greater than the host oxide.
Inventors:
;
Issue Date:
OSTI Identifier:
1332109
Assignee:
Alliance for Sustainable Energy, LLC (Golden, CO) NREL
Patent Number(s):
9,496,426
Application Number:
14/377,763
Contract Number:
AC36-08GO28308
Resource Relation:
Patent File Date: 2013 Feb 05
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 14 SOLAR ENERGY

Other works cited in this record:

Advantages of transparent conducting oxide thin films with controlled permittivity for thin film photovoltaic solar cells
journal, August 2011

Dependence of carrier lifetime on Cu-contacting temperature and ZnTe:Cu thickness in CdS/CdTe thin film solar cells
journal, February 2009

Advantages of transparent conducting oxide thin films with controlled permittivity for thin film photovoltaic solar cells
journal, August 2011

High mobility transparent conducting oxides for thin film solar cells
journal, January 2010

New transparent conducting thin films using multicomponent oxides composed of ZnO and V2O5 prepared by magnetron sputtering
journal, May 2002

Donor–acceptor pair luminescence in nitrogen-doped ZnO films grown on lattice-matched ScAlMgO4 (0001) substrates
journal, July 2003

Discovery-based design of transparent conducting oxide films
journal, June 2007

Analysis of CdS/CdTe devices incorporating a ZnTe:Cu/Ti Contact
journal, May 2007

The properties of cadmium tin oxide thin-film compounds prepared by linear combinatorial synthesis
journal, February 2004

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