title: Novel porphyrin-preparation, characterization, and applications in solar energy conversion.
abstract: Porphyrins have been demonstrated as one of the most efficient sensitizers in dye-sensitized solar cells (DSSC). Herein, we investigated a series of porphyrin sensitizers functionalized with various π-spacers, such as phenyl for LD14, thiophene for LW4, thiophene-phenyl for LW5, and 2,1,3-benzothiadiazole (BTD)-phenyl for LW24. Photo-physical investigation by means of time-resolved fluorescence and nanosecond transient absorption spectroscopy revealed an accelerated inner charge transfer in porphyrins containing the BTD-phenyl π-spacer. Implementation of an auxiliary electron-deficient BTD unit to the porphyrin spacer also results in a broad light-harvesting ability extending up to 840 nm, contributing to an enhanced charge transfer character from the porphyrin ring to the anchoring group. When utilized as a sensitizer in DSSCs, the LW24 device achieved a power conversion efficiency of 9.2%, higher than those based on LD14 or LW5 porphyrins (PCE 9.0% or 8.2%, respectively) but lower than that of the LW4 device (PCE 9.5%). Measurements of transient photovoltage decays demonstrate that the LW24 device features the up-shifted potential band edge of the conduction band of TiO2, but involves serious charge recombination in the dye/TiO2 interface. The findings provide insights into the molecular structure and the charge-transfer characteristics for designing efficient porphyrin sensitizers for DSSC applications.
authors.affiliation: Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, P. R. China. mingkui.wang@mail.hust.edu.cn.
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Lu
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.forename: Shuangshuang
authors.initials: S
authors.lastname: Liu
authors.forename: Yu-Cheng
authors.initials: YC
authors.lastname: Chang
authors.forename: Hui-Ping
authors.initials: HP
authors.lastname: Wu
authors.forename: Yibing
authors.initials: Y
authors.lastname: Cheng
authors.forename: Eric
authors.initials: E
authors.lastname: Wei-Guang Diau
authors.forename: Mingkui
authors.initials: M
authors.lastname: Wang