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1 August 2021 Twisting organic semiconductor crystals
Stephanie Lee, Yongfan Yan, Alex Shtukenberg, Bart Kahr, Yuze Zhang
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Proceedings Volume 11811, Organic and Hybrid Field-Effect Transistors XX; 1181105 (2021) https://doi.org/10.1117/12.2595148
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States
Abstract
Crystals that twist as they grow are common but little known and introduce completely unexplored features to materials design. Here, we present growth-induced twists to molecular semiconductor crystals with the expectation that microstructure and continually precessing crystallographic orientations can modulate interactions with light, charge transport, and other optoelectronic processes. We have found that a variety of organic semiconductors and charge transfer complexes can be readily induced to grow from the melt as spherulites of tightly packed helicoidal fibrils. The twisting pitch can be controlled by the degree of undercooling after melting or through the incorporation of additives. Intriguingly, charge mobilities measured using field-effect transistor platforms have been found to increase with increasing extent of twisting. These results indicate crystal twisting to be a promising strategy for modulating the performance of optoelectronic devices.
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Stephanie Lee, Yongfan Yan, Alex Shtukenberg, Bart Kahr, and Yuze Zhang "Twisting organic semiconductor crystals", Proc. SPIE 11811, Organic and Hybrid Field-Effect Transistors XX, 1181105 (1 August 2021); https://doi.org/10.1117/12.2595148
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KEYWORDS
Crystals
Organic semiconductors
Modulation
Optoelectronic devices
Optoelectronics
Phase shift keying
Semiconductors
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