A new photocrosslinkable oligothiophene for organic solar cells with enhanced stability

作者：Lanzi Massimiliano; Salatelli Elisabetta; Di Nicola Francesco Paolo; Zuppiroli Luca; Pierini Filippo

来源：Materials Chemistry and Physics, 2017, 186: 98-107.

DOI：10.1016/j.matchemphys.2016.10.034

• Electronic materials
• Polymers
• Fullerenes
• Nanostructures
• Electrical characterization
• Semiconductors

A novel thiophenic tetramer containing a cinnamate group in the side chain with a functionalization degree of 50% is reported. The tetramer was obtained by means of a simple and straightforward procedure involving the functionalization of a p-methoxyphenoxy substituted thiophenic precursor, which led to a soluble product with a good yield. The oligomer was fully characterized from a structural and chemical point of view and employed for the fabrication of small molecule organic solar cells exploiting the bulk heterojunction (BHJ) architecture. The presence of an UV-light sensitive group in the tetramer allowed the photocrosslinking of tetramer/PCBM blends, giving high values of photocurrent and conversion efficiency for the exposed samples. Moreover, the UV-treated devices showed improved stability, even upon heating for three days at 130 degrees C, thus confirming that photocrosslinking can strongly reduce phase segregation under severe operational conditions.

• 出版日期2017-1-15