Lookup NU author(s): Dr Stevin Pramana
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CuIn xGa 1-xSe 2 nanocrystals synthesized via the hot injection route have been used to make thin film solar cells with high power conversion efficiency. Thus, CuIn xGa 1-xSe 2 nanocrystals have the potential to provide a low cost and high efficiency solution to harvest solar energy. Stoichiometry control of these nanocrystals offers the possibility of tuning the band gap of this material. It is important to understand how the composition of quaternary CuIn xGa 1-xSe 2 nanocrystals evolves to control the stoichiometry of this compound. We report a systematic study of the growth and evolution pathways of quaternary CuIn 0.5Ga 0.5Se 2 nanocrystals in a hot coordination solvent. The reaction starts by the formation of a mixture of binary and ternary nanocrystals, which transforms subsequently to CuIn 0.5Ga 0.5Se 2 nanocrystals. These binary and ternary compounds dissolve in the course of the reaction, so as to provide the molecular precursor for monophasic CuIn 0.5Ga 0.5Se 2 nanocrystals to form. Here, we study the growth sequence of these spherical, monophasic CuIn 0.5Ga 0.5Se 2 nanocrystals as a function of time. Control experiments indicated that the phase changes of CuIn 0.5Ga 0.5Se 2 nanocrystals are temperature- and time-dependent. The change in the stoichiometry of CuIn 0.5Ga 0.5Se 2 during growth was estimated using Vegard's law. © 2012 American Chemical Society.
Author(s): Ahmadi M, Pramana SS, Xi L, Boothroyd C, Lam YM, Mhaisalkar S
Publication type: Article
Publication status: Published
Journal: Journal of Physical Chemistry C
Print publication date: 12/04/2012
Online publication date: 09/03/2012
ISSN (print): 1932-7447
ISSN (electronic): 1932-7455
Publisher: American Chemical Society
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