期刊
ADVANCED MATERIALS
卷 30, 期 43, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201801931
关键词
black phosphorus; density functional theory; microabsorption spectra; photocurrent; surface functionalization
类别
资金
- State Key Program for Basic Research [2015CB856505, 2017YFA0204800]
- Natural Science Funds of China [21525311, 21573156, 21773027]
- Natural Science Foundation of Jiangsu Province [BK20170005]
- Jiangsu 333 project [BRA2016353]
- Singapore MOE [R143-000-652-112, R143-000-A43-112]
- Fundamental Research Foundation of Shenzhen [JCYJ20170817100405375]
Black phosphorus (BP), as a fast emerging 2D material, shows promising potential in near-infrared (NIR) photodetection owing to its relatively small direct thickness-dependent bandgaps. However, the poor NIR absorption due to the atomically thin nature strongly hinders the practical application. In this study, it is demonstrated that surface functionalization of Ag nanoclusters on 2D BP can induce an abnormal NIR absorption at approximate to 746 nm, leading to approximate to 35 (138) times enhancement in 808 (730) nm NIR photoresponse for BP-based field-effect transistors. First-principles calculations reveal that localized bands are introduced into the bandgap of BP, serving as the midgap states, which create new transitions to the conduction band of BP and eventually lead to the abnormal absorption. This work provides a simple yet effective method to dramatically increase the NIR absorption of BP, which is crucial for developing high-performance NIR optoelectronic devices.
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