Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Publication date: 23rd October 2018
In this work, we study two easily accessible thienothiophene-triphenylamine charge transport materials by simply varying the substitution position of triphenylamine moieties on central thienothiophene π-linker. The impact of the triphenylamine substitution position on thermal, photolectrochemical and photovoltaic properties of these materials was then evaluated. Theoretical and experimental studies have evidenced that the TT-2,5-TPA molecule, in which triphenylamine locates on the 2 and 5 substitution position of thienothiophene core, having better π-conjugation than that of 3,6-isomer (TT-3,6-TPA). It was found that while their thermal, morphological and hydrophobic properties are similar; the optoelectrochemical and photovoltaic properties are importantly impacted. When applied as hole transport materials in hybrid perovskite solar cells, the 2,5-isomer exhibits a power conversion efficiency of 13.6%, which is much higher than that of its 3,6 counterpart (0.7%) under the same standard solar cell evaluation.
Key words: Triphenylamine, thienothiophene, molecular material, molecular glass, hole transporting material, perovskite solar cell
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