Synthesis and Photovoltaic Properties of Organic Photosensitizers Based on Phenothiazine Chromophore for Application of Dye-Sensitized Solar Cells

Abstract

We developed organic dye containing the multi-chromophororic system in a molecule by connecting two individual chromophores with alkyl chain directly forusein DSSCs. Each of chromophore contains phenothiazine moiety as an electron donor and various electron acceptor/anchor to identify the effects of the number of electron acceptor and the kind of electron acceptor on the performance of DSSCs. The molecular structure having multi-chromophoric system containing cyanoacrylic acid moieties provided about 10% higher J_sc value than their counter parts of single-chromophore type.

Keywords:

• Dye-sensitized solar cells
• multi-chromophoric system
• organic photosensitizers
• phenothiazinechromophore
• photovoltaic performances

Acknowledgment

This work was supported by the New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) with Dongjin Semichem Co., Ltd. grant funded by the Korea government Ministry of Knowledge Economy (No. 2009301001002D), and the Ministry of Education, Science Technology (MEST) and National Research Foundation of Korea (NRF) through the Human Resource Training Project for Regional Innovation.

Notes

^a R1 is FTO Interface resistance.

^b R2 is due to the resistance at the interface between the counter electrode and the electrolyte.

^c R3 is possibly originated from the backward charge transfer from TiO₂ to the electrolyte and the electron conduction in porous TiO₂ film.

^d τ is life time of an electron in DSSC.