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Received June 10, 2014
Accepted October 5, 2014
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Synthesis and thermal annealing treatment of octylphosphonic acid-capped CdSe-tetrapod nanocrystals for bulk hetero-junction solar cell applications
School of Chemical Engineering, Yeungnam University, 280, Daehak-ro, Gyeongsan 712-749, Korea
Korean Journal of Chemical Engineering, April 2015, 32(4), 761-766(6), 10.1007/s11814-014-0300-3
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Abstract
CdSe-tetrapod nanocrystals (NCs) were synthesized by using octylphosphonic acid (OPA) as a capping ligand and cadmium oxide (CdO) as a cadmium precursor. The effects of thermal annealing in nitrogen (N2) environment on the chemical composition, morphology, crystal structure and optoelectronic properties of the CdSe-tetrapods have been investigated. Remarkable difference in the morphological and optoelectronic properties between as-synthesized and N2-annealed CdSe NCs was observed. The photoluminescence (PL) peak of N2-annealed CdSe NCs shifted to lower energy and UV-vis absorption spectra shifted to longer wavelength, indicating the size increase and improvement of the crystallinity of the CdSe tetrapods. The power conversion efficiency of bulk hetero-junction solar cells made with the annealed CdSe NCs showed higher value compared with the efficiency of cells made with as-synthesized CdSe NCs.
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References
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Hoth N, Schilinsky P, Choulis SA, Brabec CJ, Nano Lett., 8, 2806 (2008)
