Molecular Orbital Engineering of a Panchromatic Cyclometalated Ru(II) Dye for p-Type Dye-Sensitized Solar Cells
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- 作者：Mingfu He ; Zhiqiang Ji ; Zhongjie Huang ; Yiying Wu
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：July 31, 2014
- 年：2014
- 卷：118
- 期：30
- 页码：16518-16525
- 全文大小：476K
- ISSN：1932-7455
文摘
We report a panchromatic cyclometalated Ru(II) complex, denoted as O18, which shows intense metal-to-ligand charge transfer transitions in the visible to near-IR region with the absorption tail extending to 800 nm. The panchromatic spectra response and enhanced molar extinction coefficient (蔚 = 1.9 脳 104 M鈥?鈥塩m鈥? at 593 nm in solution) of O18 are attributed to the stabilization of the lowest unoccupied molecular orbital and the increased absorption cross section via rationally extending the 蟺-conjugated system of 2,2鈥?bipyridyl (bpy) ligands. As a result, NiO solar cells sensitized with O18 show short-circuit currents up to 3.43 mA鈥塩m鈥? and efficiencies up to 0.104%, which are the best among all cyclometalated-Ru(II)-sensitized p-type dye-sensitized solar cells. Femtosecond transient absorption spectroscopy reveals decreased geminate recombination across the O18鈥揘iO interface by 1 order of magnitude compared to our previous report.