NDLI: Development of ZnSiP<inline-formula><tex-math notation=LaTeX>$_{bf 2}$</tex-math></inline-formula> for Si-Based Tandem Solar Cells

Content Provider	IEEE Xplore Digital Library
Author	Martinez, A.D. Ortiz, B.R. Johnson, N.E. Baranowski, L.L. Krishna, L. Sukgeun Choi Dippo, P.C. To, B. Norman, A.G. Stradins, P. Stevanovic, V. Toberer, E.S. Tamboli, A.C.
Copyright Year	2011
Abstract	A major technological challenge in photovoltaics is the implementation of a lattice matched optically efficient material to be used in conjunction with silicon for tandem photovoltaics. Detailed balance calculations predict an increase in efficiency of up to 12 percentage points for a tandem cell compared with single junction silicon. Given that the III-V materials currently hold world record efficiencies, both for single and multijunction cells, it would be transformative to develop a material that has similar properties to the III-V's which is also lattice matched to silicon. The II-IV-V2 chalcopyrites are a promising class of materials that could satisfy these criteria. ZnSiP₂ in particular is known to have a bandgap of ~2 eV, a lattice mismatch with silicon of 0.5%, and is earth abundant. Its direct bandgap is symmetry-forbidden. We have grown single crystals of ZnSiP2 by a flux growth technique. Structure and phase purity have been confirmed by X-ray diffraction and transmission electron microscopy. Optical measurements, along with a calculation of the absorption spectrum, confirm the ~2 eV bandgap. Because of its structural similarity to both crystalline silicon and the III-V's, ZnSiP₂ is expected to have good optoelectronic performance.
Starting Page	17
Ending Page	21
Page Count	5
File Size	515383
File Format	PDF
ISSN	21563381
Volume Number	5
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Silicon Crystals Absorption Surface morphology Photonic band gap Zinc ZnSiP2 Density functional theory (DFT) photovoltaic cells silicon tandem photovoltaics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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