NDLI: Mesoscopic titania solar cells with the tris(1,10-phenanthroline)cobalt redox shuttle: uniped <i>versus</i> biped organic dyes

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Jing Wang, Peng Zhou, Difei Xu, Mingfei Jing, Xiaoyan Liu, Jingyuan
Copyright Year	2011
Abstract	The combination of some non-iodine one-electron outer-sphere redox shuttles with high-absorption-coefficient organic D–π–A dyes has very recently brought forth a new opportunity towards efficiency enhancement of dye-sensitized solar cells (DSCs). Thereby a comprehensive understanding on the structure–property relationship of metal-free organic photosensitizers will play a pivotal role in further development of high-efficiency devices iodine-free. Herein, we scrutinize some general influences of the cyanoacrylic-acid-anchoring-group number of organic dyes upon the optoelectronic features of mesoscopic titania solar cells based on the tris(1,10-phenanthroline)cobalt(II/III) redox shuttle, by employing three pairs of uniped and biped dyes with thiophene, 3,4-ethylenedioxythiophene and 4,4-dihexyl-4H-cyclopenta[2,1-b:3,4-b′]dithiophene as the π-conjugated spacers. It is found that regardless of the spacer selection, a biped dye confers an improved light absorption coefficient of a stained titania film in comparison with its uniped analogue, which is highly desirable for cells with a one-electron outer-sphere redox shuttle, because in this type of cells a very thin titania film is always needed to satisfy the mass transport and electron collection requirements. However, our electrical impedance analyses have revealed that the alteration from a uniped chromophore to its biped congener evokes not only a downward displacement of the titania conduction band edge but also an acceleration of interfacial charge recombination of the titania electrons with cobalt(III) ions, leading to an attenuated open-circuit photovoltage, highlighting the future necessity to design a sterically bulky organic dye featuring superior light-harvesting capacity.
Starting Page	3021
Ending Page	3029
Page Count	9
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	4
Issue Number	8
Journal	Energy & Environmental Science
DOI	10.1039/c1ee01633d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Redox Dye-sensitized solar cell Optoelectronics Phenanthroline Cobalt Unipedalism Bipedalism Thiophene Dye Attenuation coefficient Electrical impedance Chromophore Biological specificity Valence and conduction bands Carrier generation and recombination
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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