Multiple-state interfacial electron injection competes with excited state relaxation and de-excitation to determine external quantum efficiencies of organic dye-sensitized solar cells

doi:10.1039/c4cp03230f

CORC > 化学研究所 > 中国科学院化学研究所

	Multiple-state interfacial electron injection competes with excited state relaxation and de-excitation to determine external quantum efficiencies of organic dye-sensitized solar cells
	Zhang, Min; Yang, Lin; Yan, Cancan; Ma, Wentao; Wang, Peng
刊名	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
	2014
卷号	16 期号:38 页码:20578-20585
ISSN号	1463-9076
DOI	10.1039/c4cp03230f
英文摘要	A comprehensive description of the complicated dynamics of excited state evolution and charge transfer at the photochemical interface in dye-sensitized solar cells is crucial to understand the mechanism of converting solar photons to clean electricity, providing an informative basis for the future development of advanced organic materials. By selecting two triarylamine-based organic donor-acceptor dyes characteristic of the respective benzoic acid and cyanoacrylic acid anchors, in this paper we reveal stepwise excited state relaxations and multiple-state electron injections at a realistic titania/dye/electrolyte interface based upon ultrafast spectroscopic measurements and theoretical simulations. Density functional theory (DFT) and time-dependent DFT calculations show that the optically generated "hot'' excited state of the dye molecules can undergo a significant conformational relaxation via multistage torsional motions, and thereby transform into an equilibrium quinonoid structure characteristic of a more planar conjugated backbone. A set of kinetic parameters derived from the target analysis of femtosecond transient absorption spectra have been utilized to estimate the electron injection yield, which is in good accord with the maximum of external quantum efficiencies.
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000342072300038
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/51445]
专题	中国科学院化学研究所
通讯作者	Wang, Peng
作者单位	Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Min,Yang, Lin,Yan, Cancan,et al. Multiple-state interfacial electron injection competes with excited state relaxation and de-excitation to determine external quantum efficiencies of organic dye-sensitized solar cells[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2014,16(38):20578-20585.
APA	Zhang, Min,Yang, Lin,Yan, Cancan,Ma, Wentao,&Wang, Peng.(2014).Multiple-state interfacial electron injection competes with excited state relaxation and de-excitation to determine external quantum efficiencies of organic dye-sensitized solar cells.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,16(38),20578-20585.
MLA	Zhang, Min,et al."Multiple-state interfacial electron injection competes with excited state relaxation and de-excitation to determine external quantum efficiencies of organic dye-sensitized solar cells".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 16.38(2014):20578-20585.