Photoactive nanocrystals by low-temperature welding of copper sulfide nanoparticles and indium sulfide nanosheets
Lim, Hui Min
Tan, Jia Yi
Batabyal, Sudip Kumar
Mhaisalkar, Subodh Gautam
Wong, Lydia H.
Date of Issue2014
School of Materials Science and Engineering
Energy Research Institute @ NTU
We successfully utilize the concept of coalescence and room-temperature sintering to prepare morphologically different nanoparticles. n-Type chalcogenide (CuIn5S8) nanocrystals are synthesized at room temperature by simple mixing of oppositely charged precursor nanoparticles. The coalescence of polycation-coated CuS nanoparticles and negatively charged In2S3 nanoplates is driven by close contact of the particles due to electrostatic interactions. Analysis by X-ray diffraction, transmission electron microscopy (TEM) imaging, and Raman spectroscopy confirms the formation of single-phase CuIn5S8 without traceable secondary phase. In a photovoltaic device, the use of the coalesced particles yields a power conversion efficiency of 1.8 %.
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