Development of high efficiency solar absorbers Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1j92gb35x

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  • Current cadmium telluride and copper indium gallium diselenide thin-film solar cells (TFSCs) utilize thick absorbers (2 - 4 μm). For efficient carrier extraction in these TFSCs, the absorber layer requires high carrier mobilities and a long minority carrier lifetime, which necessitates the use of a high purity, defect-free thin film. Developing new materials with absorption strengths stronger than those of current materials allows an ultra-thin (<1 μm) absorber to be incorporated in a drift-based TFSC. Device simulation indicates that a built-in drift field aids carrier extraction, reducing mobility and lifetime requirements. Iron- and copper-based materials are investigated within the context of ultra-thin absorbers. FeS₂ is unstable due to the formation of deleterious, low band-gap phases while Fe₂GeS₄ and CuSbS₂ exhibit a sluggish, non-abrupt onset of absorption, limiting their application in an ultra-thin drift-based TFSC. Cu₃SbS₄ exhibits desirable optical and electrical properties with a simulated TSFC efficiency of 19% for a 750 nm thick absorber layer. A new tetrahedrite-based absorber, Cu₁₀Zn₂Sb₄Se₁₃ demonstrates exceptionally strong absorption, with a simulated TSFC efficiency of 21% for a 250 nm thick absorber, indicating that Cu3SbS₄ and Cu₁₀Zn₂Sb₄Se₁₃ have potential for high efficiency drift-based TFSC applications.
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  • description.provenance : Submitted by Ram Ravichandran (ravichar@onid.orst.edu) on 2014-06-02T21:22:30Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) RavichandranRam2014.pdf: 26651480 bytes, checksum: 778c4c58e178b2a5c183f119c3cb3a74 (MD5)
  • description.provenance : Made available in DSpace on 2014-06-09T23:20:57Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) RavichandranRam2014.pdf: 26651480 bytes, checksum: 778c4c58e178b2a5c183f119c3cb3a74 (MD5) Previous issue date: 2014-05-22
  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2014-06-07T20:50:22Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) RavichandranRam2014.pdf: 26651480 bytes, checksum: 778c4c58e178b2a5c183f119c3cb3a74 (MD5)
  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2014-06-09T23:20:57Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) RavichandranRam2014.pdf: 26651480 bytes, checksum: 778c4c58e178b2a5c183f119c3cb3a74 (MD5)

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