ICCAS OpenIR
Anion-correlated conduction band edge shifts and charge transfer kinetics in dye-sensitized solar cells with ionic liquid electrolytes
Zhang, Min1; Zhang, Jing1; Bai, Yu1,2; Wang, Yinghui1; Su, Mei1,2; Wang, Peng1
2011
Source PublicationPHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN1463-9076
Volume13Issue:9Pages:3788-3794
AbstractIn solvent-free ionic liquid electrolytes for efficient dye-sensitized solar cells, iodide and non-iodide melts are ordinarily blended in order to attain a high dynamic fluidity and thereby meet a fast mass transport of electroactive species. This common tactic could bring forth a prominent impact of various anions on cell efficiency by altering photocurrent and/or photovoltage. Herein we report evident effects of the dicyanamide versus tetracyanoborate anion on the energetics of titania conduction band edge and the kinetics of multi-channel charge-transfer reactions in cells employing a high absorption coefficient ruthenium sensitizer C106. A slightly shorter photoluminescence lifetime of C106 grafted on alumina is probed for the tetracyanoborate-based reference cell with respect to the dicyanamide counterpart. However, owing to a more favourable thermodynamic driving force of similar to 90 meV, the tetracyanoborate anion prompts an almost 3-fold faster electron injection from the excited-state dye to titania than dicyanamide, leading to a higher charge separation yield, which is in good agreement with an almost indistinguishable ratio of external quantum efficiency enhancement in the whole spectral response region. Compared to tetracyanoborate, the presence of dicyanamide at the titania/electrolyte interface evokes a 27-fold smaller interfacial electron exchange rate (K) with triiodide, accounting for the open-circuit photovoltage variation observed in current-voltage measurements.
DOI10.1039/c0cp02728f
Indexed BySCI
Language英语
WOS IDWOS:000287411700025
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/72282
Collection中国科学院化学研究所
Corresponding AuthorWang, Peng
Affiliation1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Min,Zhang, Jing,Bai, Yu,et al. Anion-correlated conduction band edge shifts and charge transfer kinetics in dye-sensitized solar cells with ionic liquid electrolytes[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2011,13(9):3788-3794.
APA Zhang, Min,Zhang, Jing,Bai, Yu,Wang, Yinghui,Su, Mei,&Wang, Peng.(2011).Anion-correlated conduction band edge shifts and charge transfer kinetics in dye-sensitized solar cells with ionic liquid electrolytes.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,13(9),3788-3794.
MLA Zhang, Min,et al."Anion-correlated conduction band edge shifts and charge transfer kinetics in dye-sensitized solar cells with ionic liquid electrolytes".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 13.9(2011):3788-3794.
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