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http://hdl.handle.net/1942/31442
Title: | Manipulating the Charge Transfer Absorption for Narrowband Light Detection in the Near-Infrared | Authors: | Kaiser, Christina Schellhammer, Karl Sebastian Benduhn, Johannes SIEGMUND, Bernhard Tropiano, Manuel Kublitski, Jonas SPOLTORE, Donato Panhans, Michel Zeika, Olaf Ortmann, Frank Meredith, Paul Armin, Ardalan VANDEWAL, Koen |
Issue Date: | 2019 | Publisher: | AMER CHEMICAL SOC | Source: | Chemistry of materials, 31 (22) , p. 9325 -9330 | Abstract: | 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. | Notes: | Kaiser, C (reprint author), Swansea Univ, Singleton Pk, Swansea SA2 8PP, W Glam, Wales.; Vandewal, K (reprint author), Hasselt Univ, IMO, Wetenschapspk 1, BE-3590 Diepenbeek, Belgium. C.Kaiser.981673@swansea.ac.uk; koen.vandewal@uhasselt.be |
Keywords: | Open-Circuit Voltage;Gaussian-Basis Sets;Transfer States;Molecular Calculations;Atoms;Thermochemistry;Complexes;Thiophene;Energy;Boron | Document URI: | http://hdl.handle.net/1942/31442 | ISSN: | 0897-4756 | e-ISSN: | 1520-5002 | DOI: | 10.1021/acs.chemmater.9b02700 | ISI #: | WOS:000500039100011 | Rights: | 2019 American Chemical Society. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
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acs_chemmater_9b02700.pdf Restricted Access | Published version | 1.51 MB | Adobe PDF | View/Open Request a copy |
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