CuInS2 quantum dots synthesized by a solvothermal route and their application as effective electron acceptors for hybrid solar cells

Wenjin Yue, Shikui Han, Ruixiang Peng, Wei Shen, Hongwei Geng, Fan Wu, Shanwen Tao, Mingtai Wang

Research output: Contribution to journalArticle

153 Citations (Scopus)

Abstract

This paper describes a solvothermal approach to synthesize CuInS 2 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 (Voc) 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. © 2010 The Royal Society of Chemistry.

Original languageEnglish
Pages (from-to)7570-7578
Number of pages9
JournalJournal of Materials Chemistry
Volume20
Issue number35
DOIs
Publication statusPublished - 21 Sep 2010

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