Polymer Solar Cells: Design, Synthesis And Performance Research Of Acceptor Material Base On Fullerene (C₆₀)

Polymer Solar Cells （PSCs） owing to their advantages of simple devicestructure, light weight, low cost, easy fabrication, and possibility to make flexibledevices, has been considered a promising new energy. To further improve theperformance of the devices of polymer solar cells with PCBM, to modify themolecular of PCBM, we can enhance the LUMO （lowest unoccupied molecularorbital） energy level and the solubility of target compounds, and increase theopen circuit voltage （Voc） or short circuit current （Isc）, improve the performanceof PSCs finally.In this paper, we have designed three types of PCBM analogues. In order toscan molecular with excellent performance, we have calculated their HOMO andLUMO by Dmol3method and compared with PCBM. We havd synthesized sixPCBM analogues, and discussed the synthesis route of double fullerenederivatives. The structures of compounds were characterized by UV-vis, FT-IR,¹H NMR,¹³C NMR, MS and elemental analysis techniques. The thermal stabilityof compounds were studied by DTA and TG, the results proved that thedecomposition temperature all of them are higher than200℃, the stability isgood when using in PSCs as acceptor material. The PSCs based on P3HT as andonor and PCBM analogues as an acceptor with the structure of PSCs was ITO/PEDOT: PSS/P3HT: PCBM analogues/LiF₃/Al, and the Photovoltaic propertieswere similar with P3HT:PCBM-based PSCs under the illumination of AM1.5G,100mW/cm2under the same conditions.