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Synthesis and Study on the Photovoltaic Properties of Oxadiazole Side Chains Based on Polythiophene Derivatives and D-π-A Dyes with Different Electron Donors

Author: LiuDaXi
Tutor: TanSongTing
School: Xiangtan University
Course: Polymer Chemistry and Physics
Keywords: polymer solar cells dye-sensitized solar cells thiophene derivatives photovoltaic performance
CLC: TM914.4
Type: Master's thesis
Year: 2009
Downloads: 117
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Abstract


In this dissertation, the research progress of the materials based on bulk-heterojunction solar cells and dye-sensitized solar cells (DSSCs) were summarized systematically. The absorption spectra and carrier mobility of the materials are the major factors to affect the power conversion efficiency (PCE) of solar cells. As a result, this dissertation is focusing on the design and synthesis of series of new conjugated copolymers and D-π-A dyes. The structures of the as-synthesized copolymers and dyes were confirmed by FT-IR, 1H-NMR and 13C-NMR. The photophysical, electrochemical and photovoltaic properties of the copolymers and dyes have been investigated. In addition, the photovoltaic characteristics of the solar cells were measured. The main study results are as follows:1. Three soluble alternating conjugated copolymers P1, P2 and P3, comprised of 9,9-dihexylfluorene and thiophene derivatives with/without oxadiazole side chains, were synthesized via the palladium-catalyzed Suzuki coupling reaction. The effect of oxadiazole side chains on the thermal, optical, electrochemical and photovoltaic properties were investigated. The study results indicated that oxadiazole side chains could improve the electron-injection and transporting property. Photovoltaic cells (PSCs) were fabricated based on the blend of the as-synthesized copolymers and the fullerene acceptor [6,6]-phenyl- C61-butyric acid methyl ester (PCBM) in a 1:1 weight ratio. The power conversion efficiencies (PCE) for P1, P2 and P3 are 0.62, 0.03 and 1.49% under the illumination of AM 1.5 (100 mW/cm2), respectively.2. Three dyes (D1, D2 and D3) comprising triarylamine derivatives and 9-octylcarbazole moieties as electron donors, vinylene hexylthiophene group as an electron spacer, and a cyanoacetic acid as an electron acceptor/anchoring group were designed and synthesized. The photophysical, electrochemical properties and photovoltaic performaces of the three as-synthesized dyes with different electron donors were investigated systematically. For the dye D2, the experimental results suggested that the PCE were affected obviously in the different solvents. The DSSC based on the dye D2 exhibited the highest PCE of 6.72% under AM 1.5 irradiation with 100 mW/cm2 simulated sunlight (Jsc = 13.93 mA/cm2, Voc = 0.71 V, FF = 0.679), indicating its potential application as the metal-free organic dyes for DSSCs.

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