Development of Solution Processable Benzothiadiazole Derivatives for Organic Optoelectronic Applications

• Main Authors: Ting-Yao Bai, 白庭耀
• Other Authors: Min-Chou Chen
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/3n4jag

碩士 === 國立中央大學 === 化學學系 === 107 === A series of new organic optoelectronic materials were synthesized and characterized for organic thin film transistors (OTFTs), organic photovoltaic cells (OPVs), and hole transporting layer (HTL). For organic thin film transistors (OTFTs), a series of small molecules based on benzothiadiazole (BTA) were synthesized and characterized. The electron withdrawing core, benzothiadiazole, was coupled with thiophene for the core conjugation extension. Via the intramolecular N•••S interaction, the derived three ring system should be more planar, which should benefit the charge transfer. To increase the solubility of this three ring system, different alkyl chains were introduced to the thiophene unit to give BTAQ-6 (1), BTAQ-10 (2), and BTAQ-14 (3). For the organic photovoltaic cells series, a fused CDT unit, DCDT, was used as the central core and were end-capped with electron withdrawing groups, dicyanomethylene indanone (IN) and rhodamine (Rh), to develop two new small molecules: RhDCDT-b16 (4) and InDCDT-b16 (5) for OPV. A series of BCDT derivative, INBCDT and RhBCDT were also developed for comparison. Currently, the molecular modification and the OPV device optimization of these new compounds are undergoing. Finally, a phthalimide (PTI) core was end-capped with two triphenylamino (TPA) units to give PTI-2TPA (6) as hole transporting layer (HTL) for Pb-based PSC study. The tetrakis-TPA PTI derivative, PTI-4TPA, was also developed for comparison. Currently, the device optimization of these new HTLs is undergoing.