Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session S25: Materials and Fuels for the New Energy Economy
11:15 AM–2:15 PM,
Thursday, March 8, 2018
LACC Room: 403B
Sponsoring Units: GERA FIP
Chair: Michelle Johannes, Naval Research Lab
Abstract: S25.00005 : Novel Semiconductors for High Efficiency Photovoltaics*
1:39 PM–2:15 PM
(National Renewable Energy Laboratory)
Monolithically-integrated III-V multijunction solar cells have the potential to reach very high efficiencies, especially for devices with 4+ junctions. Typical 3 junction solar cells are commonly grown on GaAs or Ge substrates. However, the general lack of lattice-matched III-V semiconductors with bandgaps below 1.4 eV has forced device growth to be carried out via metamorphic or multiple substrate approaches. One potential route to designing optimal low bandgap materials is to alloy GaAs with Bi. Dilute concentrations of Bi induce a strong reduction in the bandgap ($\sim$88 meV/\% Bi) with only a small change in the lattice constant. If co-doped with N, this alloy can be lattice-matched to GaAs with bandgaps spanning the range of 0 – 1.43 eV. In this talk, I will discuss the growth and physics of GaAsBi alloys. I will also highlight the promise and challenges of incorporating these materials into multijunction solar cells and the further research and development that is needed to realize high performance devices.
*This work was supported by the DOE Office of Science, Basic Energy Sciences under contract DE-AC36-08GO28308.
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