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High Hole Mobility in Long‐Range Ordered 2D Lead Sulfide Nanocrystal Monolayer Films
Author(s) -
Zhao Man,
Yang Fangxu,
Liang Chao,
Wang Dawei,
Ding Defang,
Lv Jiawei,
Zhang Jianqi,
Hu Wenping,
Lu Chenguang,
Tang Zhiyong
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201601735
Subject(s) - materials science , monolayer , lead sulfide , nanocrystal , annealing (glass) , electron mobility , nanotechnology , sulfide , nanoparticle , quantum dot , optoelectronics , composite material , metallurgy
Coupling between colloidal semiconductor nanocrystals (NCs) with long‐range order is critical for designing advanced nanostructures with controlled energy flow and charge carrier transport. Herein, under the premise of keeping long‐range order in 2D NC monolayer, its native organic ligands are exchanged with halogen ions in situ at the liquid–air interface to enhance the coupling between NCs. Further treatments on the films with dimethyl sulfoxide, methanol, or their mixture effectively improve carrier mobility of the devices. The devices show repeatable enhanced p‐type transport behavior with hole mobility of up to 0.224 ± 0.069 cm 2 V −1 s −1 , the highest value reported for lead sulfide NC solids without annealing treatment. Thanks to accurate control over the surface of NCs as well as the structure of NC film, the ordered NC monolayer film of high hole mobility suggests great potentials for making reliable high performance devices.