Special Section on Hot Carrier Energy Harvesting and Conversion

Conformal TCO-semiconductor-metal nanowire array for narrowband and polarization-insensitive hot-electron photodetection application

[+] Author Affiliations
Cheng Zhang, Kai Wu, Xiaofeng Li

Soochow University, College of Physics, Optoelectronics and Energy and Collaborative Innovation Center of Suzhou Nano Science and Technology, No 1, Shizi Street, Gusu District, Suzhou 215006, China

Soochow University, Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Lab of Modern Optical Technologies of Education Ministry of China, No 1, Shizi Street, Gusu District, Suzhou 215006, China

Bo Ling

Nanyang Technological University, Division of Microelectronics, School of Electrical and Electronic Engineering, 50 Nanyang Avenue, 639798, Singapore

J. Photon. Energy. 6(4), 042502 (Jul 12, 2016). doi:10.1117/1.JPE.6.042502
History: Received April 12, 2016; Accepted May 26, 2016
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Abstract.  The use of hot electrons arising from the nonradiative decay of surface plasmons (SPs) is increasingly attracting interests in photodetection, photovoltaics, photocatalysis, and surface imaging. Nevertheless, the quantum efficiency of the hot-electron devices has to be improved to promote the practical applications. We propose an architecture of conformal TCO/semiconductor/metal nanowire (NW) array for hot-electron photodetection with a tunable optical response across the visible and near-infrared bands. The wavelength, strength, and bandwidth of the plasmonic resonance are tailored by controlling the lattice periodicity and topology. Finite-element simulation demonstrates that the near-perfect, polarization-insensitive, and ultranarrow-band optical absorption can be achieved in the conformal NW system. By the excitation of localized SPs, a strong field concentrates at the top corner of the NWs with a high hot-electrons generation rate. The analytical probability-based electrical calculation further shows that the SPs-enhanced photoresponsivity can be more than five times larger than that of the flat reference.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Cheng Zhang ; Kai Wu ; Bo Ling and Xiaofeng Li
"Conformal TCO-semiconductor-metal nanowire array for narrowband and polarization-insensitive hot-electron photodetection application", J. Photon. Energy. 6(4), 042502 (Jul 12, 2016). ; http://dx.doi.org/10.1117/1.JPE.6.042502


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