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Issue 7, 2018
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Zn-Porphyrin propped with hydantoin anchor: synthesis, photophysics and electron injection/recombination dynamics

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Abstract

In this work, Zn-porphyrin with a hydantoin anchor (ZnPHy) was designed and synthesized for dye-sensitized solar cell (DSC) applications. The synthesized ZnPHy was well characterized using IR, NMR and mass spectral techniques, and satisfactory results were obtained. Cyclic voltammetry, UV-visible absorption, steady-state fluorescence, time-resolved fluorescence and transient absorption spectroscopic techniques were employed to elucidate the electrochemical and photophysical properties of ZnPHy. The obtained properties revealed that the synthesized ZnPHy can be used as a photosensitizer for DSC applications. The nature of ZnPHy binding onto the TiO2 surface was investigated using ATR-FTIR and UV-Vis absorption measurements. The amount of adsorbed ZnPHy on TiO2 surface was reasonably fit using the Langmuir adsorption isotherm, with a binding constant value of 1.03 × 105 M−1. Time-resolved measurements were used to elucidate the rate of electron injection and the regeneration and recombination kinetics for ZnPHy/TiO2 film. The ZnPHy showed a high electron injection rate with a ϕinj of 99%. Intriguingly, the rate of electron recombination is much slower than the rates reported for carboxyl-based Zn-porphyrins. Such a high electron injection and slow electron recombination rate are beneficial to produce long-lived electrical current in a photovoltaic device. Thus, the ZnPHy-sensitized TiO2 electrode showed the best photovoltaic performance, with the short-circuit photocurrent density (JSC), open-circuit voltage (VOC) and fill factor (ff) of 3.49 mA cm−2, 0.6 V and 0.52, respectively, yielding an overall conversion efficiency (η) of 1.01%. For comparison, the ZnCOOH-sensitized electrode was also fabricated under the same conditions and yielded the η value of 0.84%. Hence, the hydantoin moiety could be a potential alternative anchoring group for DSC applications.

Graphical abstract: Zn-Porphyrin propped with hydantoin anchor: synthesis, photophysics and electron injection/recombination dynamics

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Supplementary files

Article information


Submitted
30 Oct 2017
Accepted
18 Jan 2018
First published
18 Jan 2018

Phys. Chem. Chem. Phys., 2018,20, 5117-5127
Article type
Paper

Zn-Porphyrin propped with hydantoin anchor: synthesis, photophysics and electron injection/recombination dynamics

P. Ram Kumar, E. M. Mothi, M. Ramesh and A. Kathiravan, Phys. Chem. Chem. Phys., 2018, 20, 5117
DOI: 10.1039/C7CP07326G

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