Journal
NANO RESEARCH
Volume 13, Issue 8, Pages 2091-2097Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-2815-8
Keywords
2D materials; chemical vapor deposition; PdSe2 nanosheets; electron mobility; infrared photodetector
Categories
Funding
- National Natural Science Foundation of China [61804050, 51991340, 51991343, 51872086]
- Fundamental Research Funds of the Central Universities [531107051078, 531107051055]
- Double First-Class Initiative of Hunan University [531109100004]
- Hunan Key Laboratory of Two-Dimensional Materials [2018TP1010]
- Strategic Priority Research Program of Chinese Academy of Science [XDB30000000]
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Palladium diselenide (PdSe2), a stable layered material with pentagonal structure, has attracted extensive interest due to its excellent electrical and optoelectronic performance. Here, we report a reliable process to synthesize PdSe2 via chemical vapor deposition (CVD) method. Through systematic regulation of temperature in the growth process, we can tune the thickness, size, nucleation density and morphology of PdSe2 nanosheets. Field-effect transistors based on PdSe2 nanosheets exhibit n-type behavior and present a high electron mobility of 105 cm(2)center dot V-1 center dot s(-1). The electrical property of the devices after 6 months keeping in the air show little change, implying outstanding air-stability of PdSe2. In addition, PdSe2 near-infrared photodetector shows a photoresponsivity of 660 A center dot W-1 under 914 nm laser. These performances are better than those of most CVD-grown 2D materials, making ultrathin PdSe2 a highly qualified candidate material for next-generation optoelectronic applications.
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