Journal
SMALL
Volume 18, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202106035
Keywords
halide perovskite nanocrystals; liquid-phase exfoliation; photodetection; rare-earth ion doping; transition metal dichalcogenide nanosheets
Categories
Funding
- National Research Foundation of Korea (NRF) under Ministry of Education
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2018M3D1A1058536, 2021M3H4A1A03047331]
- Korean government (MEST) [2020R1A2B5B03002697]
- Technology Innovation Programme - Ministry of Trade, Industry & Energy (MOTIE, Korea) [20012430]
- Yonsei Signature Research Cluster Program of 2021 [2021-22-0002]
- Korea Medical Device Development Fund - Korea government (the Ministry of Science and ICT) [1711138098, KMDF_PR_20200901_0077]
- Korea Medical Device Development Fund - Korea government (Ministry of Trade, Industry and Energy) [1711138098, KMDF_PR_20200901_0077]
- Korea Medical Device Development Fund - Korea government (Ministry of Health Welfare) [1711138098, KMDF_PR_20200901_0077]
- Korea Medical Device Development Fund - Korea government (Ministry of Food and Drug Safety) [1711138098, KMDF_PR_20200901_0077]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20012430] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2020R1A2B5B03002697] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this research, non-destructive dispersants CsPbX3 are utilized to disperse TMD nanosheets and enhance their photodetection properties, eliminating the need to remove the dispersant. CsPbCl3 NCs efficiently withdraw electrons from MoSe2 nanosheets and suppress dark current, resulting in flexible near-infrared MoSe2 photodetectors with high detectivity.
Transition metal dichalcogenide (TMD) nanosheets exfoliated in the liquid phase are of significant interest owing to their potential for scalable and flexible photoelectronic applications. Although various dispersants such as surfactants, oligomers, and polymers are used to obtain highly exfoliated TMD nanosheets, most of them are electrically insulating and need to be removed; otherwise, the photoelectric properties of the TMD nanosheets degrade. Here, inorganic halide perovskite nanocrystals (NCs) of CsPbX3 (X = Cl, Br, or I) are presented as non-destructive dispersants capable of dispersing TMD nanosheets in the liquid phase and enhancing the photodetection properties of the nanosheets, thus eliminating the need to remove the dispersant. MoSe2 nanosheets dispersed in the liquid phase are adsorbed with CsPbCl3 NCs. The CsPbCl3 nanocrystals on MoSe2 efficiently withdraw electrons from the nanosheets, and suppress the dark current of the MoSe2 nanosheets, leading to flexible near-infrared MoSe2 photodetectors with a high ON/OFF photocurrent ratio and detectivity. Moreover, lanthanide ion-doped CsPbCl3 NCs enhance the ON/OFF current ratio to >10(6). Meanwhile, the dispersion stability of the MoSe2 nanosheets exfoliated with the perovskite NCs is sufficiently high.
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