Nanotech 2003 Vol. 2
Nanotech 2003 Vol. 2
Technical Proceedings of the 2003 Nanotechnology Conference and Trade Show, Volume 2

Molecular Electronics Chapter 2

An Organic Molecule - Fullerene Mixture for a High Efficiency Photovoltaic Device: Theoretical Study

Authors: H. Mizuseki, K. Niimura, C. Majumder and Y. Kawazoe

Affilation: Tohoku University, Japan

Pages: 72 - 75

Keywords: phthalocyanine-fullerene supramolecule, molecular device, guest-host system, organic solar cell, photocurrent generation, simulation

The current general trend in research and development of photovoltaic elements is aimed at producing lower cost devices. An encouraging breakthrough in the development of highly efficient materials has been achieved by mixing electron-donor type polymers with suitable electron acceptors. Many fullerene-based supramolecules have been proposed as potential organic photovoltaic devices, because these materials have a large and flexible absorption combined with electrical properties similar to an inorganic semiconductor. We investigated the geometric and electronic structure of pi-conjugated molecule -fullerene complex using an ab initio quantum mechanical calculations. The electron transport of the molecules was analyzed based on spatial distribution of their frontier orbitals (HOMO and LUMO). It was found that the HOMO’s were localized on the donor sub-unit and the LUMO’s were localized on the acceptor sub-unit. The localization of the LUMO state on the donor moiety depended on excess electrons and the acceptor group.

ISBN: 0-9728422-1-7
Pages: 600

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