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论文类型：期刊论文

发表时间：2012-08-01

发表刊物：COLLOID AND POLYMER SCIENCE

收录刊物：SCIE、EI、Scopus

卷号：290

期号：12

页面范围：1145-1156

ISSN号：0303-402X

关键字：CdSe nanoparticle; Poly(3-methylthiophene); Interlayer; Hybrid composite nanoparticles; Poly(3-hexylthiophene); Ternary composite; Charge transfer; Energy transfer

摘要：Composite CdSe:poly(3-methylthiophene) (P3MT) nanoparticles have been synthesized via polymerization of 3-methylthiophene (3MT) in the presence of CdSe particles of nanorod or dot-like morphology and dispersed in the poly(3-hexylthiophene) (P3HT) matrix. The effect of the P3MT layer to mediate charge and energy transfer between CdSe and P3HT in the ternary nanocomposite system has been studied using electronic absorption, photoluminescence spectroscopy, and current-voltage measurements. The energy level diagram of the composite system has been deduced based on optical and electrochemical data of the separate components of the system. The contribution of the low- and high-molecular fractions of P3MT to control the charge transfer in order to optimize the intermediary role of P3MT is analyzed. Particularly, it was shown that excitation of the low-molecular P3MT leads to energy transfer to both CdSe and P3HT components, and it also serves as a barrier against recombination of electrons and holes separated at CdSe and P3HT, respectively. Thus, the role of the P3MT interlayer in assisting the charge separation and increasing an open-circuit voltage in the photovoltaic cell based on the ternary system is demonstrated.