Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
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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