Mixed-dimensional stacked nanocomposite structures for a specific wavelength-selectable ambipolar photoresponse

Authors
박영재심재호이주송이규승김지연고강복임상엽김성준신훈규박동희윤용주손동익
Issue Date
2024-06
Publisher
Tsinghua Univ Press
Citation
Nano Research, v.17, pp.5549 - 5558
Abstract
Mixed-dimensional composite structures using zero-dimensional (0D) quantum dots (QDs) and two-dimensional (2D) transition metal dichalcogenides (TMDs) materials are expected to attract great interest in optoelectronics due to the potential to generate new optical properties. Here, we report on the unique optical characteristics of a devices with mixed dimensional vertically stacked structures based on tungsten diselenide (WSe2)/CdSeS QDs monolayer/molybdenum disulfide (MoS2) (2D/0D/2D). Specifically, it exhibits an ambipolar photoresponse characteristic, with a negative photoresponse observed in the 400?600 nm wavelength range and a positive photoresponse appeared at 700 nm wavelength. It resulted in the high negative responsivity of up to 52.22 mA·W?1 under 400 nm, which is 163 times higher than that of the photodetector without CdSeS QDs. We also demonstrated the negative photoresponse, which could be due to increased carrier collision probability and non-radiative recombination. Device modeling and simulation reveal that Auger recombination among the types of non-radiative recombination is the main cause of negative photocurrent generation. Consequently, we discovered ambipolar photoresponse near a specific wavelength corresponding to the energy of quantum dots. Our study revealed interesting phenomenon in the mixed low-dimensional stacked structure and paved the way to exploit it for the development of innovative photodetection materials as well as for optoelectronic applications.
Keywords
GRAPHENE; OPTOELECTRONICS; SEMICONDUCTORS; PERFORMANCE; mixed-dimension; quantum dot; heterostructure; photodetector; ambipolar photoresponse
ISSN
1998-0124
URI
https://pubs.kist.re.kr/handle/201004/148489
DOI
10.1007/s12274-024-6422-y
Appears in Collections:
KIST Article > 2024
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML

qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE