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Title: Back-surface Optimization of Germanium TPV Cells

Abstract

In this work two solar cell designs have been investigated in order to improve the properties of the backside of Germanium TPV cells. In the first design. Aluminum is used as the backside contact and acts as a back surface field (BSF). The second design combines a dielectric mirror of a-Si/SiO2 with Al laser-fired point contacts (LFC). This dielectric mirror features high infrared reflection and excellent electrical passivation of the germanium back surface. Lifetime values up to 420 {mu}s have been achieved on a Germanium wafer with a resistivity of 0.5-1.5 {omega}.cm. For both solar cell designs an efficiency of 16% has been achieved assuming a microstructured tungsten emitter spectrum at 1100 deg. C with an incident radiation density of 2.5 W/cm2.

Authors:
; ; ; ;  [1]
  1. Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg (Germany)
Publication Date:
OSTI Identifier:
21054925
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 890; Journal Issue: 1; Conference: TPV7: 7. world conference on thermophotovoltaic generation of electricity, Madrid (Spain), 25-27 Sep 2006; Other Information: DOI: 10.1063/1.2711736; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; DESIGN; DIELECTRIC MATERIALS; EFFICIENCY; ELECTRIC CONDUCTIVITY; ELECTRIC CONTACTS; GERMANIUM; INTERFACES; LIFETIME; MIRRORS; PASSIVATION; SILICON; SILICON OXIDES; SOLAR CELLS; THERMOPHOTOVOLTAIC CONVERSION; TUNGSTEN

Citation Formats

Fernandez, J., Dimroth, F., Oliva, E., Hermle, M., and Bett, A. W. Back-surface Optimization of Germanium TPV Cells. United States: N. p., 2007. Web. doi:10.1063/1.2711736.
Fernandez, J., Dimroth, F., Oliva, E., Hermle, M., & Bett, A. W. Back-surface Optimization of Germanium TPV Cells. United States. doi:10.1063/1.2711736.
Fernandez, J., Dimroth, F., Oliva, E., Hermle, M., and Bett, A. W. Thu . "Back-surface Optimization of Germanium TPV Cells". United States. doi:10.1063/1.2711736.
@article{osti_21054925,
title = {Back-surface Optimization of Germanium TPV Cells},
author = {Fernandez, J. and Dimroth, F. and Oliva, E. and Hermle, M. and Bett, A. W.},
abstractNote = {In this work two solar cell designs have been investigated in order to improve the properties of the backside of Germanium TPV cells. In the first design. Aluminum is used as the backside contact and acts as a back surface field (BSF). The second design combines a dielectric mirror of a-Si/SiO2 with Al laser-fired point contacts (LFC). This dielectric mirror features high infrared reflection and excellent electrical passivation of the germanium back surface. Lifetime values up to 420 {mu}s have been achieved on a Germanium wafer with a resistivity of 0.5-1.5 {omega}.cm. For both solar cell designs an efficiency of 16% has been achieved assuming a microstructured tungsten emitter spectrum at 1100 deg. C with an incident radiation density of 2.5 W/cm2.},
doi = {10.1063/1.2711736},
journal = {AIP Conference Proceedings},
number = 1,
volume = 890,
place = {United States},
year = {Thu Feb 22 00:00:00 EST 2007},
month = {Thu Feb 22 00:00:00 EST 2007}
}