Journal
ADVANCED MATERIALS
Volume 29, Issue 42, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201703811
Keywords
2D materials; black phosphorus; Raman; transistors
Categories
Funding
- National Natural Science Foundation of China [51672305, 61605131, 61435010]
- Chinese Academy of Sciences [QYZDB-SSW-SLH034]
- Shenzhen Science and Technology Research Funding [JCYJ20150324141711624, JCYJ20160229195124187, KQTD2015032416270385]
- Science and Technology Innovation Commission of Shenzhen [KQTD2015032416270385, JCYJ20150625103619275]
- City University of Hong Kong Strategic Research Grant (SRG) [7004644]
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Black phosphorus (BP), a burgeoning elemental 2D semiconductor, has aroused increasing scientific and technological interest, especially as a channel material in field-effect transistors (FETs). However, the intrinsic instability of BP causes practical concern and the transistor performance must also be improved. Here, the use of metal-ion modification to enhance both the stability and transistor performance of BP sheets is described. Ag+ spontaneously adsorbed on the BP surface via cation- interactions passivates the lone-pair electrons of P thereby rendering BP more stable in air. Consequently, the Ag+-modified BP FET shows greatly enhanced hole mobility from 796 to 1666 cm(2) V-1 s(-1) and ON/OFF ratio from 5.9 x 10(4) to 2.6 x 10(6). The mechanisms pertaining to the enhanced stability and transistor performance are discussed and the strategy can be extended to other metal ions such as Fe3+, Mg2+, and Hg2+. Such stable and high-performance BP transistors are crucial to electronic and optoelectronic devices. The stability and semiconducting properties of BP sheets can be enhanced tremendously by this novel strategy.
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