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Synthesis and Photovoltaic Properties of Porphyrin Compounds Modified by Thiophene Derivatives

Author: LiuYiJiang
Tutor: TanSongTing
School: Xiangtan University
Course: Polymer Chemistry and Physics
Keywords: Porphyrin thiophene absorption spectra organic solar cells photovoltaic performance
CLC: TM914.4
Type: Master's thesis
Year: 2009
Downloads: 206
Quote: 2
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Abstract


Solar energy is a renewable, cleanly and inexhaustible resource in the world. The research of converting sunlight into electricity is attractive in recent years. Orgainc solar cells have been widely investigated due to its simple preparation, light weight and low cost. The research progress of the materials and devices of organic solar cells were summarized systematically in this dissertation. In specially, the current developments of the conjugated polymer electron-donor materials and organic photo-sensitizers used in organic solar cells were introduced in detail. The absorption spectra and charge mobility of the organic photovoltaic donor materials are the major factors which affect the power conversion efficiency （PCE） of solar cells. Therefore, the design and synthesis of materials with broad absorption and effective charge mobility are useful for improve the power conversion efficiency.Polythiophene （PTh） and its derivatives are one of the conjugated polymers which have been investigated extensively for polymer solar cells. Porphyrins are also a class of promising materials because of their special photophysical and photochemistry properties. There are only a few reports about organic solar cells based on porphyrins modified by thiophene. This dissertation is focusing on the design and synthesis of new porphyrin- cored （P-bs1 and P-bs2） polythiophene-arms polymers which have broader absorption band, higher charge mobility, and can improve the photovoltaic properties of the polymers based on porphyrin. At the same time, we designed and synthesized novel porphyrin dyes (PZn-T、PZn-hT and PZn-oT) with donor-π-acceptor （D-π-A） structure which were applied in dye-sensitized solar cells （DSSCs）. The structure of the synthesized compounds were proved and confirmed by FT-IR, 1H NMR, 13C NMR and element analyst.The photophysical, electrochemical of the polymers and dyes have been extensively studied by UV-Vis absorption spectra, photoluminescence spectra and cyclic voltammograms. We also investigated the photovoltaic properties of the solar cells based on the polymers and porphyrin dyes. The photophysical results indicated that the absorption spectra of the polymers and porphyrin dyes were broadened and red-shifted effectively with thiophene units increased. Electrochemical measurement displayed that the band gaps of the polymers as well as porphyrin dyes were reduced by introducing thiophene units, thus improved the charge mobility. Photovoltaic devices dased on polymers（P-bs1, P-bs2） and porphyrin dyes(PZn-T、PZn-hT and PZn-oT) exhibited good photovoltaic performance. Especially, solar cells based on P-bs2/PCBM and PZn-hT/TiO2 showed a PCE of 0.61% and 5.14%, respectively. These results indicated that porphyrin is a class of promising materials for organic solar cells.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Photocell > Solar cells
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