Study On The Influence Of Active Layers Doping Technology On The Performance Of P3HT/PCBM Organic Polymer Solar Cells

Polymer solar cells have been extensively researched due to its low fabrication cost, light weight, good flexibility, printable on plastic substrates, etc. The active layer material of organic polymer solar cells is usually made in solution, and then prepared into thin films by spin-coating, inkjet printing and so on. When the flexible substrate is selected, they can also be prepared into flexible plastic film products, which have extensive practical value in the actual production of life. However, to make the organic polymer solar products reach the level of the commercial production, the photoelectric conversion efficiency of the device has yet to be further improved. This article introduces the organic polymer solar cells’ development history, working principle, performance characterization as well as the specific production process, and then researches the different conditions on the P3HT/PCBM based organic polymer solar cells’ performance such as the addition of 1-Dodecanethiol, fluorescent inhibitor(1-Bromo-4-Nitrobenzene), fluorescent inhibitor and 1,8-Diiodooctane. The main research work in this paper is as follows:Firstly, this paper mainly studied the P3HT/PCBM based organic polymer solar cells’ performance by incorporating 1-Dodecanethiol into the active layer. By comparing the characteristics of the performance under different conditions, we find that when the amount of 1-Dodecanethiol was 1 vol%, the device performance was best. The power conversion efficiency of organic polymer solar cells is improved from 2.2% to 3.1%. Through the analysis of experimental results, the addition of 1-Dodecanethiol not only increases the intensity of light absorption but also improves the morphology of the active layer thin film. The morphology is favour for the separation and transportion of charges. To sum up, the addition of 1-Dodecanethiol in the active layer increases photoelectric conversion efficiency of the organic polymer solar cells.Secondly, we research the different incorporation of the solid derivatives of Nitrobenzene, 1-Bromo-4-Nitrobenzene, on the performance of P3HT/PCBM based organic polymer solar cells. This part mainly studies the P3HT/PCBM based organic polymer solar cells’ performance by incorporating 1-Bromo-4-Nitrobenzene in the active layer, which also indicates that it is able to improve the photoelectric conversion performance of the device. By comparing the characteristics of the performance under different conditions, we find that when the amount of 1-Bromo-4-Nitrobenzene was 25 wt%, the device performance was best. The power conversion efficiency of organic polymer solar cells is improved from 2.2% to 3.4%. Not only the photocurrent density-voltage(J-V) characteristics, the intensity of light absorption, external quantum efficiency(EQE), fluorescence spectrum and the morphology of the active layer thin film are measured but also the X-ray diffraction(XRD) patterns, transient absorption spectroscopy and dynamics photoresponse are obtained. The density functional theory(DFT) calculations were also carried out. In essence, the electron transfer complex is demonstrated to be formed between the P3 HT and1-Bromo-4-Nitrobenzene after the addition of 1-Bromo-4-Nitrobenzene. The reduced fluorescence emission to the ground state and enhanced excitonic dissociation at the donor-acceptor are observed. Ultimately, the addition of 1-Bromo-4-Nitrobenzene in the active layer increases photoelectric conversion efficiency of the organic polymer solar cells.Finally, we research the different incorporation of 1-Bromo-4-Nitrobenzene, based on 3 vol% 1,8-Diiodooctane, on the performance of P3HT/PCBM based organic polymer solar cells. The reason is that the morphology of the active layer thin film does not have any improvement when pure incorporation of 1-Bromo-4-Nitrobenzene. 1,8-Diiodooctane is proved to have a good effect on the morphology of active layer of the organic polymer solar cells. The results show that when the amount of 1-Bromo-4-Nitrobenzene was 30 wt% based on 3 vol% 1,8-Diiodooctane, the device performance was best. The power conversion efficiency of organic polymer solar cells is improved from 3.0% to 4.1%.