ICCAS OpenIR
An Extremely High Molar Extinction Coefficient Ruthenium Sensitizer in Dye-Sensitized Solar Cells: The Effects of pi-Conjugation Extension
Yu, Qingjiang1; Liu, Shi1; Zhang, Min1; Cai, Ning1,2; Wang, Yuan1; Wang, Peng1
2009-08-13
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY C
ISSN1932-7447
Volume113Issue:32Pages:14559-14566
AbstractWe report a heteroleptic ruthenium complex (007) featuring the electron-rich 5-octyl-2,2'-bis(3,4-ethylenedioxythiophene) moiety conjugated with 2,2-bipyridine and exhibiting 10.7% power conversion efficiency measured at the AM1.5G conditions, thanks to the enhanced light-harvesting that is closely related to photocurrent. This C107 sensitizer has an extremely high molar extinction coefficient,of 27.4 x 10(3) M(-1) cm(-1) at 559 nm in comparison to its analogue C103 (20.5 x 10(3) M(-1) cm(-1) at 550 nm) or Z907 (12.2 x 10(3) M(-1)cm(-1) at 521 nm) with the corresponding 5-hexyl-3,4-ethylenedioxythiopliene- or nonyl-substituted bipyridyl unit. The augmentation of molar extinction coefficients and the bathochromic shift of low-energy absorption peaks along with the pi-conjugation extension are detailed by TD-DFT calculations. The absorptivity of mesoporous titania films grafted with Z907, C103, or C107 sublinearly increases with the molar extinction coefficient of sensitizers, which is consistent with the finding derived from the surface coverage measurements that the packing density of those sensitizers decreases with the geometric enlargement of ancillary ligands. When the dye-coated titania film is immersed in a high-efficiency redox electrolyte, a lower density molecule grafting oil titania nanocrystals leads to more deep electronic states and a faster charge recombination at the titania/dye/electrolyte interface at a given electron Fermi level, explaining thee observation of a larger dark Current and a lower open-circuit photovoltage. Electrical impedance analysis further reveals that the electron diffusion length in nanocrystalline titania films is shortened along with the pi-conjugation extension of ancillary ligands.
DOI10.1021/jp904096g
Indexed BySCI
Language英语
WOS IDWOS:000268661300075
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:103[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/67286
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
Yu, Qingjiang,Liu, Shi,Zhang, Min,et al. An Extremely High Molar Extinction Coefficient Ruthenium Sensitizer in Dye-Sensitized Solar Cells: The Effects of pi-Conjugation Extension[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2009,113(32):14559-14566.
APA Yu, Qingjiang,Liu, Shi,Zhang, Min,Cai, Ning,Wang, Yuan,&Wang, Peng.(2009).An Extremely High Molar Extinction Coefficient Ruthenium Sensitizer in Dye-Sensitized Solar Cells: The Effects of pi-Conjugation Extension.JOURNAL OF PHYSICAL CHEMISTRY C,113(32),14559-14566.
MLA Yu, Qingjiang,et al."An Extremely High Molar Extinction Coefficient Ruthenium Sensitizer in Dye-Sensitized Solar Cells: The Effects of pi-Conjugation Extension".JOURNAL OF PHYSICAL CHEMISTRY C 113.32(2009):14559-14566.
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