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Journal of Nanomaterials
Volume 2015, Article ID 139382, 6 pages
http://dx.doi.org/10.1155/2015/139382
Research Article

Photoactive Layer of DSSCS Based on Natural Dyes: A Study of Experiment and Theory

1College of Science, Northeast Forestry University, Harbin, Heilongjiang 150040, China
2School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
3Department of Physics, Liaoning University, Shenyang, Liaoning 110036, China

Received 10 August 2015; Accepted 12 October 2015

Academic Editor: Tran V. Cuong

Copyright © 2015 Yuanzuo Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Three natural dyes (Forsythia suspensa, Herba Violae, and Corn leaf) have been investigated as potential sensitizers for dye-sensitized solar cells. UV-vis absorption spectra reveal that three natural dyes mainly contain the compound of pheophytin a. Among three DSSCs, the highest photo electronic conversion efficiency is 0.96% with open circuit voltage () of 0.66 V, short circuit current density () of 1.97 mA cm−2, and fill factor (ff) of 0.74. Theoretical time-dependent density functional theory and charge difference density are used to explore the nature of excited states. Results demonstrate that the first state is an intramolecular charge transfer (ICT) state, and electron injection could occur owing to the thermodynamically driving force.