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What is the photoelectric polymer material and its applications?
2019-07-26
来源：亚科官网
The optoelectronic industry is an emerging industry with great potential and a forward-looking direction for the future application of polymer materials. With the rapid advancement of technology, the research and development of optoelectronic polymer materials is accelerating their application in our daily life. The application of various photoelectric polymer materials can be seen everywhere around us, such as radiation photovoltaic, OLED, illumination, flat panel display, touch and so on.
What is a photovoltaic polymer material?
Any polymer that can perform mutual conversion of photo-electric energy can be called photoelectric polymer material, which is called OLED for short. Photoelectric polymer materials can be divided into two types: photo-electric and electro-optic. Photoelectric conversion materials are mainly used for flexible solar energy, and electro-optical conversion materials are mainly used for flexible display and illumination.
Common types of photoelectric polymer materials
3-hexylthiophene(P3HT) is currently the best polymer electron donor material. Compared with the PPV, P3HT has a lower energy gap to utilize the absorption of long-wave light in the solar spectrum, while P3HT has good intermolecular order and better carrier mobility, especially the hole transport rate can reach 10-2cm2v-1s-1, and the film is better after post-annealing or corona treatment.
PEDOT is a polymer of EDOT (3,4-ethylenedioxythiophene monomer). PEDOT has the characteristics of simple molecular structure, small energy gap and high electrical conductivity. It is widely used in the area of organic thin film solar cell material ,OLED, electrochromic materials , transparent electrode materials etc.
In 1991, Bayer Company first synthesized polythiophene derivative PEDOT, which has high conductivity and good environmental stability.
PCBM polymer is a derivative of fullerene C60, a commonly used polymer electron acceptor material. PCBM has better electron affinity than fullerenes, and its solubility, transparency and electron transport ability are better. Due to the high symmetry of the PCBM, the minimum capability conversion exhibits a form of dipole forbidden, and the wide absorption coefficient in the visible region is low. If the symmetry of the PCBM can be reduced, the degree of light absorption will be greatly improved.
PEDOT itself is insoluble that limits its application. The doping of polymer electrolyte polystyrene sulfonic acid (PSS) solves the problem of PEDOT processing which greatly increases the solubility of PEDOT. In the oxidized state, the thin layer of PEDOT is almost transparent, which is an important factor for its wide application in electronic devices.
PEDOT:PSS is an aqueous solution , and the PEDOT/PSS film has high electrical conductivity, high mechanical strength, high visible light transmittance, and superior stability, and is used as hole transport layer in OLED, organic solar cell, organic thin film transistor, supercapacitor etc.
Application of photoelectric polymer materials
Photoelectric polymer are currently mainly used in automotive power and folding mobile phones, and photoelectric conversion solar materials have not yet achieved industrial production. Institute of Chemistry Chinese Academy of Sciences, South China University of Technology, Changchun Institute of Applied Chemistry, Tsinghua University, etc. are all in the forefront of the world's research and development. The current photoelectric conversion efficiency of perovskite organic solar materials has reached 24%, very close to monocrystalline silicon materials 28% conversion efficiency. If the photovoltaic polymer material is successfully used in the field of flexible solar energy, the surface of the automobile can cover the flexible solar power generation material, and it can receive sunlight at any angle, unlike the silicon-based flat material, which can receive sunlight only in one direction. By that time, most of the power of the car can use the solar energy generated by itself, and the traditional gasoline becomes a supporting role as an emergency.
Related links: PEDOT
Edited by Suzhou Yacoo Science Co., Ltd.
