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Title: Efficiency increased to 15.2% for ultra-thin Cu(In,Ga)Se 2 solar cells

Abstract

We improved the efficiency of ultra-thin (0.49-um-thick) Cu(In,Ga)Se 2 solar cells to 15.2% (officially measured). To achieve these results, we modified growth conditions from the 3-stage process but did not add post-deposition treatments or additional material layers. The increase in device efficiency is attributed to a steeper Ga gradient in the CIGS with higher Ga content near the Mo back contact, which can hinder electron-hole recombination at the interface. We discuss device measurements and film characterization for ultra-thin CIGS. Modeling is presented that shows the route to even higher efficiencies for devices with CIGS thicknesses of 0.5 um.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1479872
Alternate Identifier(s):
OSTI ID: 1455074
Report Number(s):
NREL/JA-5K00-70468
Journal ID: ISSN 1062-7995
Grant/Contract Number:  
AC36-08GO28308; SuNLaMP 30296
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Progress in Photovoltaics
Additional Journal Information:
Journal Volume: 26; Journal Issue: 11; Journal ID: ISSN 1062-7995
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; Cu(In,Ga)Se2; CIGS; photovoltaic cells; thin films; semiconductor device modeling; current-voltage characteristics

Citation Formats

Mansfield, Lorelle M., Kanevce, Ana, Harvey, Steven P., Bowers, Karen A., Beall, Carolyn L., Glynn, Stephen, and Repins, Ingrid L. Efficiency increased to 15.2% for ultra-thin Cu(In,Ga)Se2 solar cells. United States: N. p., 2018. Web. doi:10.1002/pip.3033.
Mansfield, Lorelle M., Kanevce, Ana, Harvey, Steven P., Bowers, Karen A., Beall, Carolyn L., Glynn, Stephen, & Repins, Ingrid L. Efficiency increased to 15.2% for ultra-thin Cu(In,Ga)Se2 solar cells. United States. doi:10.1002/pip.3033.
Mansfield, Lorelle M., Kanevce, Ana, Harvey, Steven P., Bowers, Karen A., Beall, Carolyn L., Glynn, Stephen, and Repins, Ingrid L. Tue . "Efficiency increased to 15.2% for ultra-thin Cu(In,Ga)Se2 solar cells". United States. doi:10.1002/pip.3033.
@article{osti_1479872,
title = {Efficiency increased to 15.2% for ultra-thin Cu(In,Ga)Se2 solar cells},
author = {Mansfield, Lorelle M. and Kanevce, Ana and Harvey, Steven P. and Bowers, Karen A. and Beall, Carolyn L. and Glynn, Stephen and Repins, Ingrid L.},
abstractNote = {We improved the efficiency of ultra-thin (0.49-um-thick) Cu(In,Ga)Se2 solar cells to 15.2% (officially measured). To achieve these results, we modified growth conditions from the 3-stage process but did not add post-deposition treatments or additional material layers. The increase in device efficiency is attributed to a steeper Ga gradient in the CIGS with higher Ga content near the Mo back contact, which can hinder electron-hole recombination at the interface. We discuss device measurements and film characterization for ultra-thin CIGS. Modeling is presented that shows the route to even higher efficiencies for devices with CIGS thicknesses of 0.5 um.},
doi = {10.1002/pip.3033},
journal = {Progress in Photovoltaics},
number = 11,
volume = 26,
place = {United States},
year = {Tue Jun 19 00:00:00 EDT 2018},
month = {Tue Jun 19 00:00:00 EDT 2018}
}

Journal Article:
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Works referenced in this record:

Optical functions of chalcopyrite CuGaxIn1-xSe2 alloys
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Optimization of CBD CdS process in high-efficiency Cu(In,Ga)Se2-based solar cells
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Progress toward 20% efficiency in Cu(In,Ga)Se2 polycrystalline thin-film solar cells
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