Synthesis and characterization of diindeno[1,2-g:1',2'-s]rubicene based copolymers as electron transport materials for perovskite solar cells

• Main Authors: Chen, Pin-Chun, 陳品均
• Other Authors: Chen, Chin-Ti
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/upm37h

碩士 === 國立交通大學 === 應用化學系碩博士班 === 106 === We have synthesized three diindeno[1,2-g:1’,2’-s]rubicene (DIR) based copolymers: DIRBT2F, DIRDPP and DIRNDI. Because of cyclopentadiene rings at DIR structure, the driving force to aromatize by accepting electrons makes DIR is appropriate as non-fullerene electron acceptor or electron transport materials. To match the frontier energy level of perovskite, we introduced three strong electron withdrawing group: benzothiadiazole (BT), diketopyrrolopyrrole (DPP), naphthalenediimide (NDI) and successfully deeper the LUMO energy level compare with DIR molecule. According to the electrochemical cyclic voltammetry (CV), photoelectron Spectrometer (AC-2) and UV-visible absorption spectra, DIRDPP copolymer has the deepest LUMO and HOMO energy level than those of DIRBT and DIRNDI copolymers. And for thermal stability, we measured TGA, DSC and AFM and compare with dominant electron acceptor material PC61BM. The results indicate that all copolymers have great thermal stability. And from X-ray experiment, all three polymers show π-π stacking peaks. In addition, we also use theory calculation to imitate the orbital, structure and energy levels of HOMO and LUMO. We will investigate further to find out the potential of these copolymers applied for perovskite solar cell.