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Interface Modification And Theoretical Study Of Silicon/PEDOT:PSS Hybrid Solar Cells

Posted on:2018-02-28Degree:MasterType:Thesis
Country:ChinaCandidate:J W YangFull Text:PDF
GTID:2352330536956394Subject:Materials engineering
Abstract/Summary:PDF Full Text Request
For the current energy shortage situation,solar cell power generation has become an effective way to solve energy crisis.At present,silicon solar cells dominate the photovoltaic(PV)market because of its high power conversion efficiency(PCE)and stable performance.However,manufacturing the high PCE solar cells require high-temperature diffusion,ion implantation and other complex processes,which lead to the high fabrication cost and limit its wide application.Silicon-organic hybrid solar cells,a new kind of solar cells,which posses not only solution processing ability and low cost potential of organic solar cells,but also the excellent photoelectric properties of silicon solar cells,have become a hot research topic in recent years.Above all,in order to achieve high efficiency silicon-organic hybrid solar cell,the silicon/PEDOT:PSS hybrid solar cells was fabricated by silicon substrate and conductive organic.Besides,we optimized the device by the passivation of the silicon surface and the fabrication of the silicon micronano structure,the alcohol treatment of PEDOT:PSS thin films,the gold and silver nano-particles(NPs)doping of PEDOT:PSS and other aspects.The specific contents are as follows:Firstly,the well-organized vertical Si nanowire structure,Si pyramid structure and pyramid-nanohole composite structure were fabricated by the means of metal assisted chemical etching and anisotropic etching.And surface passivation was performed to reduce the surface defects of silicon substrate.It was found that the effect of nitric acid passivation was better than that of methyl passivation.Compared these three kinds of micronano structures with planar silicon,the result shows that the silicon pyramd-nanohole composite structure has the best optical trapping properties among these four kinds of structures.However,the PCE of the device is 9.60%,which is still lower than the PCE of 9.72% of the planar silicon/PEDOT:PSS hybrid solar cell.We analyze the reason is that the defect-induced charge recombination on the surface of pyramd-nanohole structure silicon limits the performance of solar cell.Secondly,methanol,ethanol and isopropanol were used to treat the PEDOT:PSS thin films.It was found that the conductivity of the film was greatly improved while maintainingthe light transmittance of the film.Through the analysis of XPS,Raman spectroscopy and AFM,the mechanism of the increasing of the conductivity of the thin films was explored.The effect of different alcohol treatment on the performance of the device was studied.It was found that the performance of the device had been greatly improved after the alcohol treatment.Especially,when the device was treated with methanol,the performance of the device is the best and the conversion efficiency is 10.87%,which is about 12% enhancement compare to the untreated one.Thirdly,we fabricate the Si/PEDOT:PSS hybrid photovoltaic device with n-type planar silicon substrate and gold or silver NPs doped PEDOT:PSS conductive organic compounds.It is found that the performance of hybrid solar cells could be improved by incorporating metal NPs into PEDOT:PSS buffer layer because of the enhancement of light absorption caused by the localized surface plasmon resonance effect of the gold and silver NPs.Moreover,we also show that cooperative plasmonic enhancement could be achieved by simply combining different NPs(Ag and Au)into PEDOT:PSS buffer layer.The PCE of 11.37% of the device could be obtained by the cooperative plasmonic enhancement,which is 17% higher than that of the untreated one.
Keywords/Search Tags:Hybrid solar cell, Micronano structure, Passivation and modification, Alcohol treatment, Localized surface plasmon resonance
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