TY - GEN
T1 - GaP/Si Heterojunction Solar Cells
T2 - 7th IEEE World Conference on Photovoltaic Energy Conversion, WCPEC 2018
AU - Saive, Rebecca
AU - Emmer, Hal
AU - Chen, Christopher T.
AU - Zhang, Chaomin
AU - Honsberg, Christiana
AU - Atwater, Harry
N1 - Funding Information:
The authors acknowledge the Molecular Foundry for generously hosting the MOCVD growth and the Caltech MMRC for providing the XPS analytic tools. We thank Laura Ding, Shaul Aloni, Adam Nielander, Noah Plymale, Amanda Shing and Lars Korte for helpful advice with measurements and data interpretation. The information, data, or work presented herein was funded in part by the U.S. Department of Energy, Energy Efficiency and Renewable Energy Program, under Award Number DE-EE0006335 for band offset characterization and EEC1041895 for other electrical and structural measurements. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
Publisher Copyright:
© 2018 IEEE.
PY - 2018/11/26
Y1 - 2018/11/26
N2 - We report on an study of the GaP/Si interface for application in silicon heterojunction solar cells. We analyzed the band alignment using X-ray photoelectron spectroscopy (XPS) and cross-sectional Kelvin probe force microscopy (x-KPFM). Our measurements show a high conduction band offset (0.9 eV) leading to a barrier in electron extraction which we microscopically resolved via x-KPFM. XPS reveals the presence of Si-Ga bonds which explains the observed interface dipole that leads to low open circuit voltage and low fill factor in GaP/Si heterojunction solar cells. Furthermore, we investigated the electronic and morphologic changes in GaP upon Si and Mg doping.
AB - We report on an study of the GaP/Si interface for application in silicon heterojunction solar cells. We analyzed the band alignment using X-ray photoelectron spectroscopy (XPS) and cross-sectional Kelvin probe force microscopy (x-KPFM). Our measurements show a high conduction band offset (0.9 eV) leading to a barrier in electron extraction which we microscopically resolved via x-KPFM. XPS reveals the presence of Si-Ga bonds which explains the observed interface dipole that leads to low open circuit voltage and low fill factor in GaP/Si heterojunction solar cells. Furthermore, we investigated the electronic and morphologic changes in GaP upon Si and Mg doping.
KW - Gallium Phosphide
KW - Silicon heterojunction
KW - band alignment
KW - doping
KW - morphology
UR - http://www.scopus.com/inward/record.url?scp=85059907014&partnerID=8YFLogxK
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U2 - 10.1109/PVSC.2018.8547704
DO - 10.1109/PVSC.2018.8547704
M3 - Conference contribution
AN - SCOPUS:85059907014
T3 - 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC
SP - 2064
EP - 2069
BT - 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC
PB - Institute of Electrical and Electronics Engineers Inc.
Y2 - 10 June 2018 through 15 June 2018
ER -