Fluorine-contained polythiophene photoelectric material with high optical conversion rate and preparation method thereof

Abstract

The invention discloses a fluorine-contained polythiophene photoelectric material with high optical conversion rate and a preparation method thereof. The fluorine-contained polythiophene photoelectric material with high optical conversion rate is in a three-embedded-segment macromolecular structure containing fluorine-contained polythiophene receptor-polythiophene- polythiophene donors, wherein a fluorine-contained polythiophene receptor is polythiophene containing a fluorine-contained alkyl chain. Compared with the prior art, the fluorine-contained polythiophene photoelectric material introduces fluorine-contained groups strongly sucking electrons in the polythiophene structure to improve the electron-receiving capability. A controllable segmental catalyst transferring and polymerizing method is utilized to synthesize the polythiophene in the regular three-embedded-segment macromolecular structure containing the fluorine-contained polythiophene receptor-polythiophene- polythiophene donors. The invention has the advantages of little defects, low carrier loss rate and high optical conversion rate and can be used in the field of organic film solar batteries to provide an ideal material for preparing solar batteries with high optical conversion rate.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a fluorine-containing polythiophene photoelectric material with high light conversion rate and a preparation method thereof. Background technique [0002] With the depletion of non-renewable energy such as petroleum and coal, and the global emphasis on environmental issues, the renewable new energy represented by the photovoltaic industry has ushered in a peak period of development in recent years. In this century, the output of photovoltaic cells in the world has risen sharply at an average annual rate of more than 40%. In 2007, the global output of solar cells reached 3436MW, a year-on-year increase of 56%. [0003] At present, the development of silicon-based solar cells has entered a stage of large-scale development, but silicon-based solar cells mainly have the following three problems: (1) High cost: With the development of the solar cell industry, the supply cris...

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Problems solved by technology

[0003] At present, the development of silicon-based solar cells has entered a stage of large-scale development, but silicon-based solar cells mainly have the following three problems: (1) High cost: With the development of the solar cell industry, the supply crisis of silicon materials has been caused, The price of silicon materials has also increased rapidly, from 65 US dollars / kg at the end of 2004 to more than 400 US dollars / kg in May 2008, almost doubling every year; (2) It is not conducive to environmental protection : The main materials for manufacturing silicon-based solar cells are monocrystalline silicon and polycrystalline silicon. The production of monocrystalline silicon and polycrystalline silicon requires high-temperature refining, which brings problems of high energy consumption and high pollution generation; (3) The potential for improving photoelectric conversion efficiency is limited and low : The theoretical limit of photoelectric conversion efficiency of single-junction, polycrystalline or amorphous silicon-based solar cells is 25%.

However, the photoelectric conversion efficiency of organic thin film solar cells is low, only 5% to 6%.

Analyzing the reason, it is mainly because in this type of solar cell, there are defects in the organic polymer film, and when the carrier is transported to the electrode, recombination occurs, resulting in a large current loss.

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