Synthesis of CuInS2, CuInSe2, and Cu(In xGa1-x)Se2 (CIGS) nanocrystal "inks" for printable photovoltaics

Department of Chemical Engineering, Texas Materials Institute and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712-1062, USA.
Journal of the American Chemical Society (Impact Factor: 12.11). 01/2009; 130(49):16770-7. DOI: 10.1021/ja805845q
Source: PubMed


Chalcopyrite copper indium sulfide (CuInS2) and copper indium gallium selenide (Cu(InxGa(1-x))-Se2; CIGS) nanocrystals ranging from approximately 5 to approximately 25 nm in diameter were synthesized by arrested precipitation in solution. The In/Ga ratio in the CIGS nanocrystals could be controlled by varying the In/Ga reactant ratio in the reaction, and the optical properties of the CulnS2 and CIGS nanocrystals correspond to those of the respective bulk materials. Using methods developed to produce uniform, crack-free micrometer-thick films, CulnSe2 nanocrystals were tested in prototype photovoltaic devices. As a proof-of-concept, the nanocrystal-based devices exhibited a reproducible photovoltaic response.

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    • "The proposed method involved relatively low temperatures. Compared to other procedures for synthesizing CZTSe nanocrystals (NCs) [17] [18] [19] [20] [21] [22] [23] [24] [25] [26], the investigated method, which involved just one heating step, was simpler and more economical. Because of the double amine groups in polyetheramine, the lowcost source materials for the elements Cu, Zn, Sn, and Se could be readily chelated and transformed into ternary and quaternary compounds. "
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    • "Thus, it is of very importance to synthesize the CIS NCs with their size smaller than 10 nm. So far, CIS has motivated the development of many synthetic approaches including a solvothermal method [18-21], a precursor decomposition method (thermolysis) [22,23,31], photochemical decomposition [24], and hot injection techniques [25-30,32]. "
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