Direct evidence of Mg-Zn-P alloy formation in Mg/Zn 3P 2 solar cells

Gregory M. Kimball, Nathan S Lewis, Harry A. Atwater

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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. The record solar energy conversion efficiency for Zn 3P 2 cells of 6% (M. Bhushan et al., Appl. Phys. Lett., 1980) used a Mg/Zn 3P 2 device geometry that required annealing to reach peak performance. Here we report photovoltaic device results and junction composition profiles as a function of annealing treatment for ITO/Mg/Zn 3P 2 devices. Mild annealing at 100°C in air dramatically increases V oc values from ∼150 mV to 550 mV, exceeding those of the record cell (V oc, record = 490 mV). In devices with thinner Mg films we achieved J sc values reaching 26 mA cm -2, significantly greater than those of the record cell (J sc, record = 14.9 mA cm -2). Junction profiling by secondary ion mass spectrometry (SIMS) and x-ray photoelectron spectroscopy (XPS) both show evidence of MgO and Mg-Zn-P alloy formation at the active photovoltaic junction in annealed ITO/Mg/Zn 3P 2 devices. These results indicate that high efficiency should be realizable by optimization of Mg treatment in Mg/Zn 3P 2 solar cells.

Original languageEnglish
Title of host publicationConference Record of the IEEE Photovoltaic Specialists Conference
Pages3381-3384
Number of pages4
DOIs
Publication statusPublished - 2011
Event37th IEEE Photovoltaic Specialists Conference, PVSC 2011 - Seattle, WA, United States
Duration: Jun 19 2011Jun 24 2011

Other

Other37th IEEE Photovoltaic Specialists Conference, PVSC 2011
CountryUnited States
CitySeattle, WA
Period6/19/116/24/11

Fingerprint

Solar cells
Annealing
Thin films
Photoelectron spectroscopy
Secondary ion mass spectrometry
Energy conversion
Solar energy
Conversion efficiency
Zinc
Earth (planet)
X rays
Geometry
Air
Chemical analysis

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering

Cite this

Kimball, G. M., Lewis, N. S., & Atwater, H. A. (2011). Direct evidence of Mg-Zn-P alloy formation in Mg/Zn 3P 2 solar cells. In Conference Record of the IEEE Photovoltaic Specialists Conference (pp. 3381-3384). [6186672] https://doi.org/10.1109/PVSC.2011.6186672

Direct evidence of Mg-Zn-P alloy formation in Mg/Zn 3P 2 solar cells. / Kimball, Gregory M.; Lewis, Nathan S; Atwater, Harry A.

Conference Record of the IEEE Photovoltaic Specialists Conference. 2011. p. 3381-3384 6186672.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kimball, GM, Lewis, NS & Atwater, HA 2011, Direct evidence of Mg-Zn-P alloy formation in Mg/Zn 3P 2 solar cells. in Conference Record of the IEEE Photovoltaic Specialists Conference., 6186672, pp. 3381-3384, 37th IEEE Photovoltaic Specialists Conference, PVSC 2011, Seattle, WA, United States, 6/19/11. https://doi.org/10.1109/PVSC.2011.6186672
Kimball GM, Lewis NS, Atwater HA. Direct evidence of Mg-Zn-P alloy formation in Mg/Zn 3P 2 solar cells. In Conference Record of the IEEE Photovoltaic Specialists Conference. 2011. p. 3381-3384. 6186672 https://doi.org/10.1109/PVSC.2011.6186672
Kimball, Gregory M. ; Lewis, Nathan S ; Atwater, Harry A. / Direct evidence of Mg-Zn-P alloy formation in Mg/Zn 3P 2 solar cells. Conference Record of the IEEE Photovoltaic Specialists Conference. 2011. pp. 3381-3384
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