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Mg doping and alloying in Zn_3P_2 heterojunction solar cells

Kimball, Gregory M. and Lewis, Nathan S. and Atwater, Harry A. (2010) Mg doping and alloying in Zn_3P_2 heterojunction solar cells. In: 2010 35th IEEE Photovoltaic Specialists Conference (PVSC). IEEE Photovoltaic Specialists Conference . IEEE , New York, pp. 1039-1043. ISBN 978-1-4244-5890-5.

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Zinc phosphide (Zn_3P_2) is a promising and earth-abundant alternative to traditional materials (e.g. CdTe, CIGS, a-Si) for thin film photovoltaics. We report the fabrication of Mg/Zn_3P_2 Schottky diodes with V_(oc) values reaching 550 mV, J_(sc) values up to 21.8 mA/cm^2, and photovoltaic efficiency reaching 4.5%. Previous authors have suggested that Mg impurities behave as n-type dopants in Zn_3P_2, but combined Hall effect measurements and Secondary Ion Mass Spectrometry (SIMS) show that 10^(17) to 10^(19) cm^(-3) Mg impurities compensate p-type doping to form highly resistive Zn_3P_2. Further device work with modified ITO/Mg/Zn_3P_2 heterojunctions suggests that the ITO capping layer improves a passivation reaction between Mg and Zn_3P_2 to yield high voltages > 500 mV without degradation in the blue response of the solar cell. These results indicate that at least 8-10% efficiency cell is realizable by the optimization of Mg treatment in Zn_3P_2 solar cells.

Item Type:Book Section
Related URLs:
URLURL TypeDescription DOIArticle
Lewis, Nathan S.0000-0001-5245-0538
Atwater, Harry A.0000-0001-9435-0201
Additional Information:© 2010 IEEE. Issue Date: 20-25 June 2010. Date of Current Version: 01 November 2010. We acknowledge Yunbin Guan and the Division of Geological and Planetary Sciences at Caltech for assistance collecting SIMS data. This work was supported by the Office of Energy Efficiency and Renewable Energy, US Department of Energy under grant DE-FG36-08G018006, the Caltech Center for Sustainable Energy Research (CCSER), as well as a partnership with the Dow Chemical Company. One of us (GMK) acknowledges support under an NDSEG graduate fellowship.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG36-08G018006
Caltech Center for Sustainable Energy ResearchUNSPECIFIED
Dow Chemical CompanyUNSPECIFIED
National Defense Science and Engineering Graduate (NDSEG) FellowshipUNSPECIFIED
Series Name:IEEE Photovoltaic Specialists Conference
Record Number:CaltechAUTHORS:20110412-141058665
Persistent URL:
Official Citation:Kimball, G.M.; Lewis, N.S.; Atwater, H.A.; , "Mg doping and alloying in Zn3P2 heterojunction solar cells," Photovoltaic Specialists Conference (PVSC), 2010 35th IEEE , vol., no., pp.001039-001043, 20-25 June 2010 doi: 10.1109/PVSC.2010.5614641 URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23288
Deposited By: Tony Diaz
Deposited On:26 May 2011 20:00
Last Modified:09 Nov 2021 16:13

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