Yue, Wenjin and Han, Shikui and Peng, Ruixiang and Shen, Wei and Geng, Hongwei and Wu, Fan and Tao, Shanwen and Wang, Mingtai (2010) CuInS2 quantum dots synthesized by a solvothermal route and their application as effective electron acceptors for hybrid solar cells. Journal of Materials Chemistry, 20 (35). pp. 7570-7578. ISSN 0959-9428Full text not available in this repository. (Request a copy from the Strathclyde author)
This paper describes a solvothermal approach to synthesize CuInS2 quantum dots (QDs) and demonstrates their application as a potential electron accepting material for polymer-based hybrid solar cells, for the first time. The CuInS2 QDs with a size of 2-4 nm are synthesized by the solvothermal method with 4-bromothiophenol (HSPh) as both reduction and capping agents, and characterized by XRD, XPS, TEM, FT-IR, cyclic voltammetry (CV), and absorption and photoluminescence spectra. Results reveal that the CuInS2 QDs result from the solvothermal decomposition of a soluble organic sodium salt as an intermediate precursor formed by simple reactions among CuCl2, InCl3, HSPh and Na2S at room temperature; they have an ionization potential (IP) of -5.8 eV and an electron affinity (EA) of -4.0 eV and can quench effectively the luminescence of poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV). Due to the favorable IP and EA positions with respect to MEH-PPV, the CuInS2 QDs act as an effective electron acceptor for the hybrid solar cells based on MEH-PPV/CuInS2-QDs blends with a wide spectral response extending from 300 to 900 nm, by allowing the efficient charge separation for neutral excited states produced either on the polymer or on the QDs. The MEH-PPV/CuInS2-QDs solar cells exhibit a promising open circuit voltage (V-oc) of 0.62 V under the monochromic illumination of 15.85 mW cm(-2) at 470 nm. The charge transfer processes in the solar cells are also described.
|Keywords:||polymer photovoltaic cells, single-source precursors, semiconductor nanocystals, conjugated polymers, energy transfer, PPV derivatives, nanoparicles, polythiophene, devices, composites, Chemical technology, Materials Chemistry, Chemistry(all)|
|Subjects:||Technology > Chemical technology|
|Department:||Faculty of Engineering > Chemical and Process Engineering|
|Depositing user:||Pure Administrator|
|Date Deposited:||10 Oct 2011 14:01|
|Last modified:||14 Oct 2016 02:29|