期刊
CHEMICAL SCIENCE
卷 10, 期 7, 页码 2186-2192出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8sc04969f
关键词
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资金
- Shanghai Municipal Science and Technology Major Project [2018SHZDZX03]
- international cooperation program of the Shanghai Science and Technology Committee [17520750100]
- NSFC [21472047, 21772041, 201702062, 21811530005, 21878078]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [GZ2016006]
- Shanghai Pujiang Program [17PJ1401700]
- Fundamental Research Funds for the Central Universities [WK1616004, 222201717003]
- Program of Introducing Talents of Discipline to Universities [B16017]
- China Scholarship Council
- British Council
Porphyrin sensitizers play essential roles in the development of efficient dye-sensitized solar cells (DSSCs). To further improve power conversion efficiency (PCE), it is vital to reduce undesirable dye aggregation that causes serious charge recombination and lowered open-circuit voltages (V-oc). To this end, we herein report a new class of porphyrin-based dyes XW40 and XW41, with the porphyrin cores strapped with two circle chains. Compared with the reference sensitizer XW10 which contains a porphyrin core wrapped in four dodecoxyl chains, the double strapping in XW40 not only effectively suppresses the dye aggregation but also improves the dye loading amount. As a result, the V-oc and photocurrent (Jsc) were improved by 19 mV and 0.8 mA cm(-2), respectively, compared with the corresponding values of XW10, and the efficiency was improved from 8.6% obtained for XW10 to 9.3% for XW40. To further extend the spectral response, an electron-withdrawing benzothiadiazole (BTD) unit was introduced as an auxiliary acceptor in XW41. Impressively, the onset wavelength of its IPCE spectrum was dramatically red-shifted to 830 nm. However, the extended pi-conjugation framework results in aggravated dye aggregation, and thus a lowered efficiency of 8.2% was obtained for XW41. Through a combined approach of coadsorption and cosensitization, the efficiencies were dramatically enhanced to 10.6% and 10.2% for XW40 and XW41, respectively, as a result of simultaneously enhanced V-oc and J(sc). The results of this work provide a novel strategy for developing efficient DSSCs by employing strapped porphyrin dyes.
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