Fluoro-functionalization of vinylene units in a polyarylenevinylene for polymer solar cells

Abstract

A low band-gap copolymer PDTBTFV alternating bis-thienyl-(bis-alkoxy)-benzothiadiazole blocks with difluorovinylene units and its non-fluorinated counterpart PDTBTV have been synthesized and characterized as donor materials in bulk heterojunction (BHJ) solar cells with PCBM as the acceptor. The solar cells with the fluorinated polymer show better photovoltaic performances than those recorded with the non-fluorinated material. Comparative spectroscopic and computational studies, together with morphological, electrical and optical characterization of thin films, have been carried out to shed light on the reasons for the improvement of performances as induced by the double bond fluorination. Our study introduces the fluorinated double bond as a new conjugated unit in donor polymers for BHJ solar cells

A Novel Conjugated Polymer Consists of Benzimidazole and Benzothiadiazole: Synthesis, Photophysics Properties, and Sensing Properties for Pd2+

“…The synthetic routes of Monomer 1, Monomer 2, and PPBIBTE are illustrated in Scheme . The synthesis of compound 1,2,3,4 was prepared according to references .…”

Organometallic Approaches to Conjugated Polymers for Plastic Solar Cells: From Laboratory Synthesis to Industrial Production

“…The same method was later extended to the synthesis of the two soluble conjugated polymers P22 and P23, in which the double bonds (either fluorinated or not) alternated with bis-thienyl-bis-alkoxybenzothiadiazole units (Scheme 10). [25] Scheme 10.…”

Polymer design for solar cell – Current trend and future scenario

“…Two copolymer of thienylvinylene with fluorination (P48) and without fluorination (P49) were synthesised by Cardone et al They found that the fluorination induces blue shift in the absorbance and lowering of the HOMO level. Additionally, the non-fluorinated polymer P49 showed a meagre PCE of less than 1% and the fluorinated counterpart P48 showed PCE of 1.24% [59]. Further, thienylenevinylene moiety was homopolymerised via Yamamoto technique and compared the homopolymers (P50) with copolymer of thienylenevinylene with benzothiadiazole (P51) and dithienylbenzothiadiazole (P52).…”