Study On Performance Of Organic Solar Cell Devices Based On P3HT And Condensed Ring Conjugated Polymers

In the world today,with the rapid development of society and economy,the demand for energy is increasing.Traditional fossil energy has shown irreversible weakness.Countries around the world are actively looking for new renewable clean energy to meet the strategic needs for both development of economy and environmental protection.Organic solar cells have aroused more and more attention due to their advantages of light weight,flexibility,curling,rich raw materials,and simple preparation process.Among them,the organic solar cell with polymer poly?3-hexylthiophene??P3HT?as donor material and fullerene derivative[6,6]-phenyl C₆₁1 butyric acid methyl ester(PC₆₁BM)as acceptor material is a relatively mature system.This article took the organic solar cell of P3HT:PC₆₁BM system as an example.The preparation and basic optimization process of organic solar cells were introduced,and the influence of different parameters on the performance of solar cell devices during the optimization process was analyzed.However,the photoelectric conversion efficiency of organic solar cells of the P3HT:PC₆₁BM system was relatively low,and it was not an ideal high efficiency organic solar cell material.In order to improve the photoelectric conversion efficiency of the organic solar cells and improve the performance of the devices,we have prepared an organic solar cell with two polycyclic conjugated polymers of PTTABDT and PBTTABDT based on 5-?2-octyldodecyl?-4H-thieno[2',3':4,5]thieno[3,2-c]thieno[2',3':4,5]thieno[2,3-e]azepine-4,6?5H?-dione?TTA?unitasdonor material and[6,6]-phenyl C₇₁1 butyric acid methyl ester(PC₇₁BM)as the receptor material,and made a certain research and Analysis on it.Experimental data showed that the performance of organic solar cell devices in the two systems of PTTABDT:PC₇₁BM and PBTTABDT:PC71BM has a very significant improvement compared to the organic solar cells in the P3HT:PC₆₁BM system.The main research contents of this article are as follows:?1?An organic solar cell of the P3HT:PC₆₁BM system was prepared and got the best optimization conditions by comparing the difference in the ratio of the donor to the acceptor,the thickness of the active layer,the annealing conditions,and the additive treatment.The results showed that the device performance was the best when the ratio of donor to acceptor was 1:0.4,the rotational speed was 1200rpm,the thermal annealing temperature was 150°C,the thermal annealing time was 5min,and with no addition of DIO.?2?The molecular structures,thermal stability,light absorption characteristics and cyclic voltammetry characteristics of two condensed ring conjugated polymer materials PTTABDT and PBTTABDT were introduced.Based on this,two organic solar cell devices with PTTABDT and PBTTABDT as donor materials respectively,PC₇₁BM as the acceptor material were prepared to analyze the photovoltaic performance,charge transport performance,exciton dissociation and complex mechanism of two condensed ring conjugated polymer solar cells.Moreover,we analyzed the film morphology and XRD pattern of the two types of organic solar cells.The results showed that the material properties of the D-A-A conjugated polymer PBTTABDT plus one acceptor unit and the performance of the solar cell device based on PBTTABDT were better than the D-A type conjugated polymer PTTABDT based on the TTA unit.