Issue 1, 2016

Unprecedentedly targeted customization of molecular energy levels with auxiliary-groups in organic solar cell sensitizers

Abstract

In dye-sensitized solar cells (DSSCs), the HOMO–LUMO energy gap of organic sensitizers should be large enough to enable efficient electron injection and dye regeneration. However, the LUMOs of most practical organic dyes are always too high, making energy “waste”. In order to deepen the LUMOs, we focus on the targeted modulation of the molecular energy levels by embedding an electron donor or acceptor into the skeleton of a typical D–π–A model. The electron-rich group of 3,4-ethylenedioxythiophene (EDOT) lifts up the HOMO level with little influence on the LUMO, while the electron-deficient group of benzothiadiazole (BTD) or benzooxadiazole (BOD) mainly lowers the customized LUMO level. As a consequence, the auxiliary group change from EDOT (dye WS-53) to BOD (dye WS-55) brings forth a huge photoelectric conversion efficiency (PCE) increase by 38 fold from 0.24 to 9.46% based on an I/I3 redox couple, and even reaching a high PCE of 10.14% with WS-55 under 0.3 sunlight irradiation.

Graphical abstract: Unprecedentedly targeted customization of molecular energy levels with auxiliary-groups in organic solar cell sensitizers

Supplementary files

Article information

Article type
Edge Article
Submitted
29 Jul 2015
Accepted
08 Okt 2015
First published
09 Okt 2015
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY license

Chem. Sci., 2016,7, 544-549

Author version available

Unprecedentedly targeted customization of molecular energy levels with auxiliary-groups in organic solar cell sensitizers

Y. Xie, W. Wu, H. Zhu, J. Liu, W. Zhang, H. Tian and W. Zhu, Chem. Sci., 2016, 7, 544 DOI: 10.1039/C5SC02778K

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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