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Photoactive Nanocrystals by Low‐Temperature Welding of Copper Sulfide Nanoparticles and Indium Sulfide Nanosheets
Author(s) -
Lim Hui Min,
Tan Jia Yi,
Batabyal Sudip K.,
Magdassi Shlomo,
Mhaisalkar Subodh G.,
Wong Lydia H.
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201402333
Subject(s) - materials science , copper sulfide , nanoparticle , raman spectroscopy , indium , chalcogenide , transmission electron microscopy , chemical engineering , nanocrystal , coalescence (physics) , copper , sulfide , nanotechnology , covellite , chalcopyrite , metallurgy , optics , physics , astrobiology , engineering
We successfully utilize the concept of coalescence and room‐temperature sintering to prepare morphologically different nanoparticles. n‐Type chalcogenide (CuIn 5 S 8 ) nanocrystals are synthesized at room temperature by simple mixing of oppositely charged precursor nanoparticles. The coalescence of polycation‐coated CuS nanoparticles and negatively charged In 2 S 3 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 CuIn 5 S 8 without traceable secondary phase. In a photovoltaic device, the use of the coalesced particles yields a power conversion efficiency of 1.8 %.