Journal
ADVANCED OPTICAL MATERIALS
Volume 7, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201900023
Keywords
CIGS; core-shell structures; heterojunctions; photodetectors; Si nanowires
Categories
Funding
- National Natural Science Foundation of China [51422206, 51372159, 51502184, 51872191]
- 333 High-level Talents Cultivation Project of Jiangsu Province
- 1000 Youth Talents Plan
- Key University Science Research Project of Jiangsu Province
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Six Talents Peak Project of Jiangsu Province
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Designing Si nanowire-based heterostructures provides a promising path to construct self-driven and broadband photodetectors, which are the key components for optoelectronic systems. Herein, the first fabrication of a p-CuIn0.7Ga0.3Se2 nanoparticles/n-Si nanowire array core-shell structure through a simple two-stage processspin coating and selenization treatmentand its integration into a self-driven photodetector are reported. The heterojunction photodetector is sensitive to broad wavelength range from UV light to visible and near-infrared light, with high detectivity of up to 1.6 x 10(13) Jones, large responsivity of 0.33 A W-1, and an ultrafast response speed of 823/356 mu s at zero bias. Additionally, this core-shell nanostructure exhibits good air stability and strong ability to detect weak light sources such as fluorescent lamp and lighter. The superior performance can be attributed to the strong light absorption of both Si and CuIn0.7Ga0.3Se2, the unique vertically standing core-shell structure, and effective photogenerated carriers' separation and transportation at the heterojunction interface.
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