Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 15, Issue 40, Pages 17064-17069Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp52929k
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Funding
- Visiting Investigatorship Programme (VIP) of the Agency for Science, Technology and Research (A*STAR), Republic of Singapore
- Ministry of Education of Singapore via the AcRF Tier 1 grant
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A benzothiadiazole end-capped small molecule 3,6-bis(5-(benzo[c][1,2,5]thiadiazol-4-yl)thiophen-2-yl)-2,5-bis(2-butyloctyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione (BO-DPP-BTZ) using a fused aromatic moiety DPP (at the centre) is designed and synthesized. BO-DPP-BTZ is a donor-acceptor-donor (D-A-D) structure which possesses a band gap of 1.6 eV and exhibits a strong solid state ordering inferred from similar to 120 nm red shift of the absorption maxima from solution to thin film. Field-effect transistors utilizing a spin coated thin film of BO-DPP-BTZ as an active layer exhibited a hole mobility of 0.06 cm(2) V-1 s(-1). Solution-processed bulk heterojunction organic photovoltaics employing a blend of BO-DPP-BTZ and [70] PCBM demonstrated a power conversion efficiency of 0.9%.
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