Influence of the electrolyte cation in organic dye-sensitized solar cells: lithium versus dimethylimidazolium

	Influence of the electrolyte cation in organic dye-sensitized solar cells: lithium versus dimethylimidazolium
	Li RZ ; Liu DX ; Zhou DF ; Shi YS ; Wang YH ; Wang P
刊名	energy & environmental science
	2010
卷号	3 期号:11 页码:1765-1772
关键词	TITANIUM-DIOXIDE FILMS CHARGE RECOMBINATION NANOCRYSTALLINE TIO2 TRANSPORT INJECTION IMPEDANCE SEMICONDUCTORS PERFORMANCE EFFICIENCY DIFFUSION
ISSN号	1754-5692
通讯作者	li rz
中文摘要	we investigate the influence of electrolyte cations such as lithium and dimethylimidazolium on the spectroscopic and electrical characteristics of dye-sensitized solar cells based on a metal-free chromophore c218. an evident bathochromic effect of lithium with respect to dimethylimidazolium is noticed for the c218 dye-coated nanocrystalline titania film via measuring electronic absorption and photocurrent action spectra. in comparison with dimethylimidazolium, the use of lithium as the electrolyte cation evokes a downward shift of the excited-state redox potential of the c218 sensitizer by 120 mv, and that of the conduction band edge of the nanocrystalline tio2 film by 390 mev. the resultant remarkable variation in the energy alignment at the titania/dye interface brings on dissimilar electron injection yields as revealed by transient emission measurements. modulating the titania surface states distribution with lithium relative to dimethylimidazolium induces a slightly declining electron diffusion coefficient in the mesoporous titania film. however, the adsorption of lithium cations on titania strongly retards the interfacial charge recombination compared to dimethylimidazolium, contributing to an over one order of magnitude of enhancement of electron diffusion length. the improvement of electron diffusion length has a noticeable effect on the charge collection yield, which can also be observed by measuring monochromatic incident photon-to-electron conversion efficiencies. further interface engineering is needed to enhance both the photovoltage and photocurrent, making use of the full power of metal-free organic dyes.
收录类别	SCI收录期刊论文
语种	英语
WOS记录号	WOS:000283602400015
公开日期	2012-04-25
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/43319]
专题	长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式 GB/T 7714	Li RZ,Liu DX,Zhou DF,et al. Influence of the electrolyte cation in organic dye-sensitized solar cells: lithium versus dimethylimidazolium[J]. energy & environmental science,2010,3(11):1765-1772.
APA	Li RZ,Liu DX,Zhou DF,Shi YS,Wang YH,&Wang P.(2010).Influence of the electrolyte cation in organic dye-sensitized solar cells: lithium versus dimethylimidazolium.energy & environmental science,3(11),1765-1772.
MLA	Li RZ,et al."Influence of the electrolyte cation in organic dye-sensitized solar cells: lithium versus dimethylimidazolium".energy & environmental science 3.11(2010):1765-1772.