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dc.contributor.advisorHaaegel, Nancy M.
dc.contributor.authorOng, Zi Xuan.
dc.dateDecember 2011
dc.date.accessioned2012-08-22T15:33:10Z
dc.date.available2012-08-22T15:33:10Z
dc.date.issued2011-12
dc.identifier.urihttp://hdl.handle.net/10945/10665
dc.description.abstractMulti-junction solar cells are an emerging technology that improves the conversion rate of solar energy. Indium Gallium Phosphide (InGaP) is commonly used as the top cell in multi-junction cells grown on Germanium (Ge) or Gallium Arsenide (GaAs) substrates. To design more efficient solar cells using InGaP, it is important to characterize its transport parameters, particularly the minority charge carrier mobility, diffusion length and lifetime as a function of doping and material growth conditions. In this work, transport imaging was performed on a set of InGaP heterostructures (with differing thicknesses, doping levels and minority carrier types) to determine their minority carrier diffusion length. These measurements, together with an independent set of time-resolved photoluminescence (TRPL) lifetime data, were used to calculate the minority carrier mobility values. For the shortest diffusion lengths, experimental limitations were encountered involving the finite carrier generation volume. Simulations were performed to explore the potential of modeling the convolution of diffusion behavior with a finite generation region to address these limitations. Transport imaging was also performed on a set of Copper Indium Gallium Selenide (CIGS) materials. Polycrystalline CIGS represents an alternative to the expensive single-crystal InGaP. These initial experiments identified the challenges of applying transport imaging to polycrystalline materials.en_US
dc.format.extentxvi, 75 p. : col. ill. ; 28 cm.en_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted.en_US
dc.subject.lcshPhotoluminescence.en_US
dc.titleTransport imaging of multi-junction and CIGS solar cell materialsen_US
dc.contributor.secondreaderMichael, Sherif
dc.contributor.departmentPhysics.
dc.subject.authorTransport Imagingen_US
dc.subject.authorSolar Cellsen_US
dc.subject.authorInGaPen_US
dc.subject.authorCIGSen_US
dc.subject.authorMinority Charge Carrieren_US
dc.subject.authorDiffusion Lengthen_US
dc.subject.authorMinority Charge Carrier Mobilityen_US
dc.description.serviceSingapore Armed Forces authoren_US
etd.thesisdegree.nameM.S. in Combat Systems Technologyen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineCombat Systems Technologyen_US
etd.thesisdegree.grantorNaval Postgraduate School (U.S.)en_US


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