D--A--D type small molecules with naphtho[2,3-c][1,2,5]thiadiazole as the central accepting core for organic photovoltaic
Sumita Boonnab a, Thanaporn Manyum a, Taweesak Sudyoadsuk b, Vinich Promarak b
a School of Chemistry, Institute of Science, Suranaree University of Technology, Muang District, Nakhon Ratchasima 30000, Thailand
b 2Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Wangchan, Rayong 21210, Thailand
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Sumita Boonnab, 212
Publication date: 11th February 2019


In this work, two new D-p-A-p-D type small molecules (NT2 and NT3) were synthesized and investigated as molecular donor for OPV applications. NT2 and NT3 comprise of naphtho[2,3-c][1,2,5]thiadiazole as core acceptor (A) and triphenylamine as terminal donor (D) linked with bithiophene and terthiophene as π-conjugated spacer (p), respectively. They were synthesized using a combination of bromination and Pd-catalyzed Suzuki cross-coupling reactions and chemically characterized by NMR, FT-IR and MS techniques. The effects of the π-conjugated spacer units on molecular aggregation, absorption spectra, film morphology, hole mobilities and photovoltaic performance have been fully studied. The results indicate that NT3 possesses red-shifted absorption spectrum, more appropriate microphase separation and better photovoltaic performance than NT2.


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