Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 22, Pages 9325-9330Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b02700
Keywords
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Funding
- UKRI EPSRC Doctoral Training Account studentship
- Welsh Government's Ser Cymru II Sustainable Advanced Materials Program (European Regional Development Fund)
- Welsh Government's Ser Cymru II Sustainable Advanced Materials Program (Welsh European Funding Office)
- Welsh Government's Ser Cymru II Sustainable Advanced Materials Program (Swansea University Strategic Initiative)
- German Federal Ministry for Education and Research (BMBF) through the InnoProfile project Organische p-i-n Bauelemente 2.2 [03IPT602X]
- Ser Cymru II Program Sustainable Advanced Materials (Welsh European Funding Office European Regional Development Fund)
- EPSRC [EP/N020863/1, 2105065] Funding Source: UKRI
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Charge generation and recombination processes at interfaces between electron donating (donor, D) and accepting molecules (acceptor, A) are mediated by intermolecular charge-transfer (CT) states. Since organic photovoltaic and photodetecting devices rely on D-A interfaces, an understanding of the molecular and morphological aspects governing CT state properties is crucial. In this paper, we synthesize a novel series of bi(thio)pyranylidene donor molecules and show how the interplay of molecular structure and energy levels in a D-C-60 blend affect the line shape of the CT absorption cross section. By rationally designing the molecule 2,2',6,6'-tetra-(2-methylthienyl)-4,4'-bithiopyranylidene, we achieve a 2 times stronger CT absorption peak than the literature-known molecule 2,2',6,6'-tetraphenyl-4,4'-bipyranylidene when blended with C-60. The low CT state energy combined with relatively strong CT absorption of this new material blend is exploited by fabricating near-infrared, cavity enhanced narrowband detectors. The photodetectors cover an impressive wavelength range from 810 to 1665 nm with line widths between 30 and 50 nm.
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