Co-polymer of 2,7-fluorene and bithiazole, method for preparing same and solar battery containing same

A method for preparing co-polymer of 2,7-fluorene and bithiazole, comprising:

• (1) Providing compound A and compound B represented by the following formulas separately:
• where R1 and R2 are C1-C20 alkyl;
• (2) In an oxygen-free environment, adding the compound A and compound B in a molar ratio of 1:1-1.2 into organic solvent containing catalyst;
• heating the mixture and conducting Suzuki coupling reaction;
• cooling to room temperature, then stopping the reaction;
• adding methanol to the solution obtained in the previous step to precipitate, then extracting with Soxhlet extractor;
• conducting extraction under pressure by methanol and n-hexane successively;
• conducting extraction using chloroform as an extractant until the solution obtained in the previous step becomes colorless;
• collecting chloroform solution and evaporating to give red powders;
• vacuum drying the red powders, and co-polymer represented by formula (I) is obtained:
• Where R1 and R2 are C1-C20 alkyl, n is an integer between 10 and 100.