Investigation of light-matter interaction in single vertical nanowires in ordered nanowire arrays

Li, Z, Li, L, Wang, F, Xu, L ORCID: https://orcid.org/0000-0001-9071-4311, Gao, Q, Alabadla, A, Peng, K, Vora, K, Hattori, HT, Tan, HH, Jagadish, C and Fu, L, 2022. Investigation of light-matter interaction in single vertical nanowires in ordered nanowire arrays. Nanoscale. ISSN 2040-3364

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Abstract

Quasi one-dimensional semiconductor nanowires (NWs) in either arrays or single free-standing forms have shown unique optical properties (i.e., light absorption and emission) differently from their thin film or bulk counterparts, presenting new opportunities for achieving enhanced performance and/or functionalities for optoelectronic device applications. However, there is still a lack of understanding of the absorption properties of vertically standing single NWs within an array environment with light coupling from neighboring NWs within certain distances, due to the challenges in fabrication of such devices. In this article, we present a new approach to fabricate single vertically standing NW photodetectors from an ordered InP NW arrays using the focused ion beam technique, to allow direct measurements of optical and electrical properties of single NWs standing in an array. The light-matter interaction and photodetector performance are investigated using both experimental and theoretical methods. The consistent photocurrent and simulated absorption mapping results reveal that the light absorption and thus photoresponse of single NWs are strongly affected by the NW array geometry and related light coupling from their surrounding dielectric environment, due to the large absorption cross section and/or strong light interaction. While the highest light concentration factor (~ 19.64) was obtained from the NW in an array with a pitch of 1.5 µm, the higher responsivity per unit cell (equivalent to NW array responsivity) of a single standing NW photodetector was achieved in an array with a pitch of 0.8 µm, highlighting the importance of array design for practical applications. The insight from our study can provide important guidance to evaluate and optimize the device design of NW arrays for a wide range of optoelectronic device applications.

Item Type:	Journal article
Publication Title:	Nanoscale
Creators:	Li, Z., Li, L., Wang, F., Xu, L., Gao, Q., Alabadla, A., Peng, K., Vora, K., Hattori, H.T., Tan, H.H., Jagadish, C. and Fu, L.
Publisher:	Royal Society of Chemistry (RSC)
Date:	10 February 2022
ISSN:	2040-3364
Identifiers:	Number Type 10.1039/d1nr08088a DOI 1518181 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Ward
Date Added:	15 Feb 2022 14:54
Last Modified:	10 Feb 2023 03:00
URI:	https://irep.ntu.ac.uk/id/eprint/45676

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