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- Title
Ligand effects on electronic and optoelectronic properties of two-dimensional PbS necking percolative superlattices.
- Authors
Zhao, Man; Ding, Defang; Yang, Fangxu; Wang, Dawei; Lv, Jiawei; Hu, Wenping; Lu, Chenguang; Tang, Zhiyong
- Abstract
The inter-nanocrystal (NC) distance, necking degree, ordering level, and NC surface ligands all affect the electronic and optoelectronic properties of NC solids. Herein, we introduce a unique PbS structure of necking percolative superlattices to exclude the morphological factors and study the effect of ligands on the NC properties. X-ray photoelectron spectroscopy data indicate that 1,2-ethanedithiol (EDT), oxalic acid, mercaptopropionic acid, and NHSCN (SCN) ligands were attached to the surface of NCs by substrate-supported ligand exchange. Field-effect transistors were tested and photodetector measurements were performed to compare these NC solids. An SCN-treated film had the highest mobility and responsivity under high-power intensity irradiation owing to its high carrier density, whereas an EDT-treated film had the lowest mobility, photocurrent, and dark current. These findings introduce new avenues for choosing suitable ligands for NC applications.
- Publication
Nano Research, 2017, Vol 10, Issue 4, p1249
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-016-1351-z