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

作　　者：Young Jae Park Jaeho Shim Joo Song Lee Kyu Seung Lee Ji-Yeon Kim Kang Bok Ko Sang-Youp Yim Seongjun Kim Hoon-Kyu Shin Donghee Park Yong Ju Yun Dong Ick Son 

机构地区：[1]Institute of Advanced Composite Materials,Korea Institute of Science and Technology,Jeollabuk-do 55324,Republic of Korea [2]National Institute for Nanomaterials Technology,Pohang University of Science and Technology,Gyeongsangbuk-do 37673,Republic of Korea [3]Department of Semiconductor Science and Technology,Semiconductor Physics Research Center,Jeonbuk National University,Jeonju 54896,Republic of Korea [4]Advanced Photonics Research Institute,Gwangju Institute of Science and Technology,Gwangju 61005,Republic of Korea [5]Center for Opto-Electronic Materials and Devices,Post-Silicon Semiconductor Institute,Korea Institute of Science and Technology,Seoul 02792,Republic of Korea [6]Graduate School of Energy and Environment(KU-KIST Green School),Korea University,Seoul 02841,Republic of Korea [7]KIST School,Department of Nanomaterials and Nano Science,University of Science and Technology(UST),Daejeon 34113,Republic of Korea

出　　处：《Nano Research》2024年第6期5549-5558,共10页纳米研究（英文版）

基　　金：the financial support from the KIST Institution Program(No.2E32634);Basic Science Research Program through the National Research Foundation of Korea(NRF)grant funded by the Korea government(Ministry of Science and ICT)(Nos.NRF-2017R1A2B3002307 and NRF-2016M3A7B4900135);Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(No.NRF-2020R1A6A3A01099388);the National R&D Program through the National Research Foundation of Korea(NRF)funded by Ministry of Science and ICT(Nos.NRF-2022M3H4A1A04074153 and RS-2023-00239634).

摘　　要：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(WSe_(2))/CdSeS QDs monolayer/molybdenum disulfide(MoS_(2))(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.

关 键 词：mixed-dimension quantum dot HETEROSTRUCTURE PHOTODETECTOR ambipolar photoresponse 

分 类 号：O61[理学—无机化学]