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Title: Six-Junction Concentrator Solar Cells

Abstract

We report on six-junction inverted metamorphic (6J IMM) solar cells developed for concentrator applications. Monolithic III-V structures are grown by metal organic vapor phase epitaxy with junction bandgaps of 2.06, 1.70, 1.40, 1.16, 0.94, and 0.70 eV. The top three junctions are lattice-matched to the GaAs substrate, but the bottom three junctions use three consecutive metamorphic compositionally graded buffers to transition the lattice constant to GaxIn1-xAs compositions with the previously listed bandgaps. Performance of 6J IMM devices at one-sun AM1.5 Direct conditions gives VOC = 5.301 V, JSC = 8.05 mA/cm2, fill factor=83.9%, and efficiency=35.8%. Promising operation at high concentration is achieved but the spectrum was not controlled to AM1.5D. Tunnel junctions do not limit until at least several hundred suns. High concentration performance appears to be limited by internal heterojunction barriers created by zinc diffusion that decreases the fill factor. The properties of each junction within the 6J IMM have been separately characterized through electroluminescence and luminescent coupling measurements.

Authors:
 [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. National Renewable Energy Laboratory (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:
1475512
Report Number(s):
NREL/CP-5900-71300
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the 14th International Conference on Concentrator Photovoltaic Systems (CPV-14), 16-18 April 2018, Puertollano, Spain
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; solar cells; concentrators; junction; bandgaps

Citation Formats

Geisz, John F, Steiner, Myles A, Schulte, Kevin L, Young, Matthew R, France, Ryan M, and Friedman, Daniel J. Six-Junction Concentrator Solar Cells. United States: N. p., 2018. Web. doi:10.1063/1.5053512.
Geisz, John F, Steiner, Myles A, Schulte, Kevin L, Young, Matthew R, France, Ryan M, & Friedman, Daniel J. Six-Junction Concentrator Solar Cells. United States. doi:10.1063/1.5053512.
Geisz, John F, Steiner, Myles A, Schulte, Kevin L, Young, Matthew R, France, Ryan M, and Friedman, Daniel J. Thu . "Six-Junction Concentrator Solar Cells". United States. doi:10.1063/1.5053512.
@article{osti_1475512,
title = {Six-Junction Concentrator Solar Cells},
author = {Geisz, John F and Steiner, Myles A and Schulte, Kevin L and Young, Matthew R and France, Ryan M and Friedman, Daniel J},
abstractNote = {We report on six-junction inverted metamorphic (6J IMM) solar cells developed for concentrator applications. Monolithic III-V structures are grown by metal organic vapor phase epitaxy with junction bandgaps of 2.06, 1.70, 1.40, 1.16, 0.94, and 0.70 eV. The top three junctions are lattice-matched to the GaAs substrate, but the bottom three junctions use three consecutive metamorphic compositionally graded buffers to transition the lattice constant to GaxIn1-xAs compositions with the previously listed bandgaps. Performance of 6J IMM devices at one-sun AM1.5 Direct conditions gives VOC = 5.301 V, JSC = 8.05 mA/cm2, fill factor=83.9%, and efficiency=35.8%. Promising operation at high concentration is achieved but the spectrum was not controlled to AM1.5D. Tunnel junctions do not limit until at least several hundred suns. High concentration performance appears to be limited by internal heterojunction barriers created by zinc diffusion that decreases the fill factor. The properties of each junction within the 6J IMM have been separately characterized through electroluminescence and luminescent coupling measurements.},
doi = {10.1063/1.5053512},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {9}
}

Conference:
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Works referenced in this record:

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Building a Six-Junction Inverted Metamorphic Concentrator Solar Cell
journal, March 2018