新型共軛聚合物與齊聚物的設(shè)計合成與光電性能的研究
[Abstract]:Population growth and industrialization have led to a growing demand for energy. Now the main energy-petrochemical resource can only be used for several decades, according to the current consumption rate. In order to solve the contradiction between development and energy demand, a new, green, environment-friendly and renewable energy source has become a world problem to be solved. Solar energy has long begun to be used by human beings, coupled with the inexhaustible solar energy, which is now more and more important in the energy crisis. The efficiency and path of solar energy now limits the industry's development, and how to convert solar energy into electrical energy with the lowest possible cost is a problem that can be solved through joint efforts across the globe. Compared with the traditional inorganic silicon solar cell, the organic solar cell (OSC) has the advantages of light weight, low cost and flexibility, and can realize the wide attention of roll-to-roll printing and large-area. At present, the photoelectric conversion efficiency of organic solar cells reported in the literature has exceeded 10%, but there are still many problems to be solved in order to realize large-scale commercial application. The efficiency and lifetime of the organic solar cell, in addition to the optimization and innovation of the process, is more dependent on the synthesis and design of new materials. the near infrared detector of the polymer is another important branch of organic photoelectric, Near-infrared range detection. and has great practical value in the aspects of biological sensing, night imaging and environmental monitoring. From the viewpoint of material design and synthesis, the new polymer near-infrared material with wide absorption spectrum, simple structure and solution processing is the main breakthrough in this field. In this paper, the organic solar cell material with local regularity in the molecule is synthesized by using a heterocyclic design with a chemical preferential selectivity, such as difluorobenzene diethylamine unit, fluorobenzene and diethylamine, etc., and the influence of the photoelectric property is studied. In the second chapter, based on the design thought of the weak Hellor srong acieptor, the electron donor of 9-methylene group is used as electron donor, and the electron acceptors with different electron absorption intensities such as difluorobenzene and difluorobenzene are coupled through suzbach. In this paper, a series of locally structured small molecule solar cell donor materials are synthesized, and the regulation effect of different electron withdrawing units on energy level, spectrum and photoelectric performance is carefully compared. In chapter three, the polydispersity of the polymer determines that the polymer is a mixture of different molecular chain lengths, different end-group molecules. The structure and properties of PSBBT polymer (PSBBT) polymer constructed by the same structural unit can be studied as a model compound. With the increase of chain length, the spectrum became red, the band gap became narrower, the molar absorption coefficient was increased, and the photovoltaic performance and morphology developed in favorable direction. In chapter 4, we use ADA intermediate in the third chapter to synthesize a regular D2-A-D1-A terpolymer with electron donor with different electron-rich ability. Compared with the traditional DA alternating copolymer, the energy level and the spectrum can be fine-tuned by D2 units, and meanwhile, the change of the D2 and D1 side chains can lead the polymer to achieve a better balance on the solubility and the carbon-acid accumulation, wherein the efficiency of the PBDT-O-DA device is 4 percent, which is higher than that of the diethylamine of the same side chain and improves the efficiency of the two-phase polymerization of benzene and benzene. In the fifth chapter, we replace the D of the ADA precursor in chapter 4 with the benzidine which is weaker in the electron capacity, and replace it with a two-way unit, which is more suitable for the design idea of the weak writer. At the same time, the photoelectric properties are optimized by Stille coupling and some high-performance electron donor such as trimethylamine and cyclopentadiene, benzene and dibenzidine, and the efficiency of PBDTEHPBP energy conversion is preferably 4.96%. In chapter 6, we synthesized two kinds of near-infrared materials by synthesizing Se _ 2O _ 2 and a new heterocyclic fluorine-substituted benzene and selenium-diethylamine unit. Among them, the light response of CDTPSE reaches 1100nm, and it has great potential for application in organic near infrared detector. In chapter 7, we synthesized the D2-A-D1-A structured polymer based on benzene and diethylamine as the core, compared the influence of different side chains on the photoelectric properties and applied it to the organic solar cell.
【學(xué)位授予單位】:華南理工大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2015
【分類號】:TM914.4;O631
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