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Preparation and Performance of CIS Materials

Author: HeJingJing
Tutor: WuSiXin
School: Henan University
Course: Materials Physics and Chemistry
Keywords: solar cells structure CIS nanocrystals
CLC: O611.4
Type: Master's thesis
Year: 2012
Downloads: 188
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Abstract


Solar cells, as one of new energies, have attracted great attention for its cheap and clean.Chalcopyrite compound CuIn（S/Se）2（CIS） is one of the most promising materials due to its excellentperformance in solar cells, such as direct and tunable energy band gap, extraordinarily high absorptioncoefficient, long-term stability, high conversion efficiency, fine anti-interference and good radiationresistance. It is fundamental important to Control the shape, size, and structure of inorganic nanomaterialsbecause of the strong correlation between these parameters and physical chemical properties. Until now,CIS nanomaterials with different shape, size, and structure have been synthesized by many kinds ofmethods. In this paper, we successfully prepared CIS of special structure, excellent performance, low-costand environmentally friendly by the one-pot route and bio-template method, respectively. These resultssuggest that CIS can be used as absorbed layer in solar cells and counter electrode in DSSCs.In this paper, the main contents and results are studied as follows：In chapter2, novel chalcopyrite copper indium sulfide （CuInS2） nanocrystals （NCs） weresynthesized by a simple one-pot route using the inorganic ligand [Sn（acac）2Cl2] as auxiliary agent （cappingagent and shape-control agent）. The factors, reaction temperature, reaction time and amount ofSn（acac）2Cl2, that influence the morphology, size, monodispersity and optical properties of the CuInS2NCswere studied in detail. And two growth mechanisms for preparation of CuInS2NCs have been discussed.When changing the reaction environment, chalcopyrite CuInS2quantum dots with size less than5nm havebeen synthesized in the air. The absorption and PL emission spectra of the CuInS2quantum dots weretunable, which depended on the size of the nanocrystals. It is worth noting that wurtzite CuInS2have been synthesized by changed the reaction solvent under the same condition. These results show that atmosphereenvironment and reaction solvent play significant roles in the synthesis of CuInS2.In chapter3, the photoelectric properties of CuInS2with two types of structures as counterelectrode have been discussed. The CuInS2-FTO films were prepared by drop casting method. Comparedwith the Pt electrode, the better photoelectric conversion efficiency was obtained when CuInS2-FTO filmwas used as counter electrode without further chemical treatments. All results indicate that the CuInS2material can be applied in counter electrode in DSSCs.In chapter4, using butterfly wings as templates, we have replicated the microstructure of originalbutterfly wings by the sol-gel technique. The influences of temperature and heating rate on the morphologywere carefully analyzed. By adjusting the parameter mentioned above, integrate and precise butterfly wingsmicrostructure could be maintained in the CuInSe2materials. In addition, the properties of synthesizedCuInSe2have also been studied.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Chemical elements and inorganic compounds > Inorganic synthetic chemistry
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