Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 50, Pages 26151-26157Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202110676
Keywords
flexible crystals; optical waveguides; organic phototransistors; organic semiconductors
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Funding
- New York University Abu Dhabi
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The first organic semiconductor crystal with a unique combination of properties has been developed, serving as a multifunctional optoelectronic device. Flexible single crystals of 9,10-bis(phenylethynyl)anthracene (BPEA) can function as a phototransistor, photoswitch, and an optical waveguide, with significantly low optical loss in the telecommunications range.
We report the first organic semiconductor crystal with a unique combination of properties that can be used as a multifunctional optoelectronic device. Mechanically flexible single crystals of 9,10-bis(phenylethynyl)anthracene (BPEA) can function as a phototransistor, photoswitch, and an optical waveguide. The material can exist as two structurally different solid phases, with single crystals of one of the phases being elastic at room temperature while those of the other are brittle and become plastic at higher temperature. The output and transfer characteristics of the devices were characterized by measuring the generation and temporal response of the switching of the photogenerated current. The current-voltage characteristics of both phases exhibit linearity and symmetry about the positive and negative voltages. The crystals transmit light in the telecommunications range with significantly low optical loss for an organic crystalline material.
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