期刊
2D MATERIALS
卷 3, 期 4, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/3/4/041004
关键词
WSe2; photoconductivity; phototransistor; multi-terminal transport; dichalcogenide; field-effect transistor; quantum efficiency
资金
- US Army Research Office through MURI grant [W911NF-11-10362]
- NSF [DMR-1229217, 2DARE-EFRI-1542707]
- state of Florida
- [NSF-DMR-0084173]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1229217] Funding Source: National Science Foundation
Recently, two-dimensional materials and in particular transition metal dichalcogenides (TMDs) have been extensively studied because of their strong light-matter interaction and the remarkable optoelectronic response of their field-effect transistors (FETs). Here, we report a photoconductivity study from FETs built from few-layers of p-WSe2 measured in a multi-terminal configuration under illumination by a 532 nm laser source. The photogenerated current was measured as a function of the incident optical power, of the drain-to-source bias and of the gate voltage. We observe a considerably larger photoconductivity when the phototransistors were measured via a four-terminal configuration when compared to a two-terminal one. For an incident laser power of 248 nW, we extract 18 A W-1 and similar to 4000% for the two-terminal responsivity (R) and the concomitant external quantum efficiency (EQE) respectively, when a bias voltage V-ds = 1 V and a gate voltage V-bg = 10 V are applied to the sample. R and EQE are observed to increase by 370% to similar to 85 A W-1 and similar to 20 000% respectively, when using a four-terminal configuration. Thus, we conclude that previous reports have severely underestimated the optoelectronic response of transition metal dichalcogenides, which in fact reveals a remarkable potential for photosensing applications.
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