CuInS2 quantum dots synthesized by a solvothermal route and their application as effective electron acceptors for hybrid solar cells
CuInS2 quantum dots synthesized by a solvothermal route and their application as effective electron acceptors for hybrid solar cells
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DOI：
10.1039/c0jm00611d
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发表时间：
2010-08
影响因子：
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通讯作者：
Wenjin Yue;Shikui Han;Ruixiang Peng;W. Shen;H. Geng;Fan Wu;S. Tao;Mingtai Wang
中科院分区：
文献类型：
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作者：
Wenjin Yue;Shikui Han;Ruixiang Peng;W. Shen;H. Geng;Fan Wu;S. Tao;Mingtai Wang
本文介绍了一种溶剂热法合成CuInS 2量子点（QD），并展示了其作为一个潜在的电子接受材料的聚合物基混合太阳能电池的应用，为第一次。以4-溴苯硫酚（HSPh）为还原剂和封端剂，采用溶剂热法合成了尺寸为2-4 nm的CuInS 2量子点，并通过XRD、XPS、TEM、FT-IR、循环伏安（CV）、吸收光谱和光致发光光谱对其进行了表征。结果表明，CuInS 2量子点是由CuCl 2、InCl 3、HSPh和Na 2S在室温下简单反应生成的可溶性有机钠盐作为中间前驱体，经溶剂热分解得到的;它们具有-5.8 eV的电离势（IP）和-4.0 eV的电子亲和势（EA），并且可以有效地猝灭聚的发光。（2-甲氧基-5-（2-乙基己氧基）-1，4-亚苯基亚乙烯基）（MEH-PPV）。由于相对于MEH-PPV有利的IP和EA位置，CuInS 2 QD充当基于MEH-PPV/CuInS 2-QD共混物的混合太阳能电池的有效电子受体，具有从300至900 nm的宽光谱响应，通过允许在聚合物或QD上产生的中性激发态的有效电荷分离。MEH-PPV/CuInS 2-QDs太阳能电池在470 nm处15.85 mW cm-2的单色光照射下表现出0.62 V的有希望的开路电压（Voc）。还描述了太阳能电池中的电荷转移过程。
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 (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.