Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 5, Pages 2760-2765Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja210430b
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Funding
- National Science Foundation (NSF), Division of Materials Research (DMR) solid-state chemistry [DMR-0705687-002]
- Air Force Office of Scientific Research (AFOSR) [FA9550-09-1-0256]
- Samsung Advanced Institute of Technology
- Agency for Science, Technology, and Research (A*STAR), Singapore
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Field-effect transistors based on single crystals of organic semiconductors have the highest reported charge carrier mobility among organic materials, demonstrating great potential of organic semiconductors for electronic applications. However, single-crystal devices are difficult to fabricate. One of the biggest challenges is to prepare dense arrays of single crystals over large-area substrates with controlled alignment. Here, we describe a solution processing method to grow large arrays of aligned C-60 single crystals. Our well-aligned C-60 single-crystal needles and ribbons show electron mobility as high as 11 cm(2)V(-1)s(-1) (average mobility: 5.2+/-2.1 cm(2)V(-1)s(-1) from needles; 3.0+/-0.87 cm(2)V(-1)s(-1) from ribbons). This observed mobility is similar to 8-fold higher than the maximum reported mobility for solution-grown n-channel organic materials (1.5 cm(2)V(-1)s(-1)) and is similar to 2-fold higher than the highest mobility of any n-channel organic material (similar to 6 cm(2)V(-1)s(-1)). Furthermore, our deposition method is scalable to a 100 mm wafer substrate, with around 50% of the wafer surface covered by aligned crystals. Hence, our method facilitates the fabrication of large amounts of high-quality semiconductor crystals for fundamental studies, and with substantial improvement on the surface coverage of crystals, this method might be suitable for large-area applications based on single crystals of organic semiconductors.
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