ICCAS OpenIR
Influences of cation charge density on the photovoltaic performance of dye-sensitized solar cells: lithium, sodium, potassium, and dimethylimidazolium
Shi, Yushuai2,3; Wang, Yinghui1; Zhang, Min1; Dong, Xiandui2
2011
Source PublicationPHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN1463-9076
Volume13Issue:32Pages:14590-14597
AbstractWe investigate the dependence of the photovoltaic performance of dye-sensitized solar cells on the cations with different charge densities, such as lithium (Li+), sodium (Na+), potassium (K+), and dimethylimidazolium (DMI+). The efficiencies of light harvesting, electron injection and charge collection were evaluated to clarify the influence of cation selection on photocurrent generation. It is found that the short-circuit photocurrents of DSCs gradually diminish with decreasing cation charge densities, partially owing to reduced electron injection rates which are intimately related to the reaction Gibbs free energies. Further experiments indicate that the upward movement of conduction band edge results in decreased reaction Gibbs free energy of electron injection from Li+ to DMI+. At an irradiation of 100 mW cm(-2) AM1.5 sunlight, the open-circuit photovoltage and the fill factor of a typical dye-sensitized solar cell increase in the order of Li+ < Na+ < K+ < DMI+. Analyses of impedance data reveal that the increase of cell photovoltage mainly correlates with the upward shift of the conduction band edge induced by the adsorption of low-charge-density cations on the surface of titania nanocrystals. A J-V model was proposed to understand the improvement of the fill factor. It is found that the increase of the fill factor stems from the decrease of recombination current density under the equilibrium state in the dark by fitting the J-V data with the model.
DOI10.1039/c1cp21020c
Indexed BySCI
Language英语
WOS IDWOS:000293516200038
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:44[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/71398
Collection中国科学院化学研究所
Corresponding AuthorZhang, Min
Affiliation1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Electroanalyt Chem, Engn Lab Modern Analyt Tech, Changchun 130022, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Shi, Yushuai,Wang, Yinghui,Zhang, Min,et al. Influences of cation charge density on the photovoltaic performance of dye-sensitized solar cells: lithium, sodium, potassium, and dimethylimidazolium[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2011,13(32):14590-14597.
APA Shi, Yushuai,Wang, Yinghui,Zhang, Min,&Dong, Xiandui.(2011).Influences of cation charge density on the photovoltaic performance of dye-sensitized solar cells: lithium, sodium, potassium, and dimethylimidazolium.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,13(32),14590-14597.
MLA Shi, Yushuai,et al."Influences of cation charge density on the photovoltaic performance of dye-sensitized solar cells: lithium, sodium, potassium, and dimethylimidazolium".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 13.32(2011):14590-14597.
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