添加劑調(diào)控P3HT薄膜形貌的機(jī)理及其光電性能
[Abstract]:Optimizing the active layer morphology is an important means to improve the efficiency of polymer solar cell devices. The addition of the third component is an effective method, which can not only induce the crystallization and increase the crystallinity of polymer, but also optimize the separation scale between donor and recipient. In this paper, two kinds of polystyrene with different molecular configurations and two liquid crystal small molecules with different molecular structures were used as additives to study their effects on the crystallization and phase separation behavior and P3HT crystallization of poly (3-hexylthiophene) / fullerene (P3HT/PCBM) blend films. Firstly, random polystyrene (aPS) and syndiotactic polystyrene (sPS) were blended with P3HT and PCBM in different proportions. The compatibility, film morphology and device efficiency of the ternary blend were characterized and analyzed. The effects of different molecular configurations on the morphology of P3HT/PCBM thin films and the efficiency of solar cells were investigated. The results show that aPS or sPS are incompatible with P3HT. When the content of aPS is less than 50 wt%, the crystallinity of P3HT increases, the molecular chain spacing increases from 1.63 nm to 1.76 nm, and the crystalline size of P3HT decreases with the increase of aPS content. In aPS/P3HT/PCBM ternary blend films, with the increase of aPS content, the morphology of the films changed from columnar structure to layered structure, while PCBM tended to be enriched at the phase interface between aPS and P3HT. When the content of sPS is 3 wt%, sPS can induce the crystallization of P3HT and further increase its content. The crystallization of P3HT is inhibited. When the content of aPS is 50 wt%, the aPS/P3HT/PCBM system still has a higher photoelectric conversion efficiency (1.2%), while when the sPS content is 3 wt%, the efficiency of sPS/P3HT/PCBM system decreases rapidly to 0.6%. Therefore, the molecular configuration of polystyrene has great influence on the morphology of P3HT/PCBM films and the performance of solar cells. Secondly, the liquid crystalline (LCs) (LCP) and dioctyltrithiophene (8-TTP-8) liquid crystalline (LCs) of two different molecular structures of 4-cyano-4keto-pentyltriphenyl (5CT) and dioctyltrithiophene (8-TTP-8) were blended with P3HT, and the solution of LCs/P3HT blend was rotated on quartz wafer, and the solvent was slowly volatilized in the process of solvent volatilization. Apply a magnetic field with an intensity of 1 T. Under the action of magnetic field, liquid crystal molecules preferentially self-assemble and then act as templates to induce P3HT to crystallize to form nanowires. The results show that the two kinds of liquid crystal small molecules can form ordered structure after the treatment of magnetic field, and further induce the crystallization of P3HT, enhance the 蟺-蟺 stacking between the chains of P3HT molecules, and make P3HT form more nanowires. The formation of nanowires increases the carrier mobility of P3HT films. The carrier mobility of 8-TTP-8/P3HT films increased from 1.092 脳 10 ~ (-4) cm2/Vs to 3.346 脳 10 ~ (-4) cm2/Vs, of pure P3HT films, while that of 5CT/P3HT samples increased to 3.114 脳 10 ~ (-4) cm2/Vs. after magnetic field treatment. Compared with the pure P3HT samples, the carrier mobility of the blends was increased by about three times, indicating that the liquid crystal could induce P3HT to form nanowires under the action of magnetic field, and further improve the carrier mobility of the films.
【學(xué)位授予單位】:南昌大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TB383.2;TM914.4
【共引文獻(xiàn)】
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