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• W2273240428 abstract "Silicon is one of the most studied semiconductormaterials with techniques to control and manipulate its propertieswell established by the integrated circuit (IC) industry. Whilesilicon wafer-based technology constitutes about 85% of thephotovoltaics (PV) market, there are compelling reasons to developthin-film solar cells. These include potential material cost andenergy savings achievable with thin absorber layers of directband-gap thin film materials, and the potential for incorporationof thin film PV onto inexpensive, flexible, or building materialsubstrates, which opens up the possibility of new applications.Given the success of silicon wafer-based solar cells in the PVmarket, crystalline silicon on glass is a natural choice forthin-film PV technology. However, the efficiency of this technologyis still too low to compete in the PV market. In fact, its recordefficiency is only 10.5% which was achieved by CSG Solar. In orderto boost the efficiency of this technology, we explore the use ofion-beam assisted deposition (IBAD) to create biaxially-texturedsilicon films which can potentially have less defects at the grainboundaries. Experimentally, we have fabricated an operationalbiaxially-textured silicon solar cell whose Voc is likely to havebeen affected by intra-grain defects as shown by our transmissionelectron microscopy (TEM) image. In order to investigate theinterplay between grain boundary and intra-grain defects on solarcell performance and determine the potential benefits of developingbiaxially-textured film solar cells, I used Synopsys'two-dimensional technology computer-aided design (TCAD) Sentaurussimulation tool. In general, the simulations found thatbiaxially-textured silicon solar cells improve solar cellefficiencies but there is small improvement for devices that haveboth large grains and low intra-grain carrier lifetime. Among thevarious thin-film technologies, CdTe and Cu(In, Ga)(S, Se)2(CIGSSe), dominate the thin-film PV market. However in recentyears, the photovoltaic community has seen growing interest inCZTS-based thin-film solar cells which include Cu2ZnSnS4 (CZTS),Cu2ZnSnSe4 (CZTSe) and Cu2ZnSn(S, Se)4 (CZTSSe) solar cells. Thisis driven by their potential to replace Cu(In, Ga)Se2 (CIGSe) andCdTe solar cells which face material scarcity, toxicity and marketacceptance issues. In polycrystalline CIGSe-based (CIGSe, CISe,CuGaSe2 (CGSe)) and CdTe solar cells, grain boundaries do not seemto affect solar cell efficiency as much. In fact, some studies haveidentified grain boundaries as the source of high efficiency inpolycrystalline CIGSe-based and CdTe solar cells. CIGSe-based andCZTS-based films are similar in terms of growth methods,optoelectronic and crystallographic properties. Because of thesesimilarities and the benign nature of grain boundaries inCIGSe-based and CdTe films, it would be useful to examine theproperties of grain boundaries in these materials. Using scanningKelvin probe microscopy (SKPM) and conductive atomic forcemicroscopy (C-AFM)…" @default.
• W2273240428 created "2016-06-24" @default.
• W2273240428 creator A5045279175 @default.
• W2273240428 date "2014-01-01" @default.
• W2273240428 modified "2023-09-27" @default.
• W2273240428 title "The study of grain boundaries in polycrystalline thin-filmsolar cells" @default.
• W2273240428 hasPublicationYear "2014" @default.
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