Ligand effects on electronic and optoelectronic properties of two-dimensional PbS necking percolative superlattices

被引：18

作者：

Zhao, Man ^{[1
]}

Ding, Defang ^{[1
]}

Yang, Fangxu ^{[3
,4
]}

Wang, Dawei ^{[1
]}

Lv, Jiawei ^{[1
]}

Hu, Wenping ^{[3
,4
]}

Lu, Chenguang ^{[1
,2
]}

Tang, Zhiyong ^{[1
,2
]}

机构：

[1] Natl Ctr Nanosci & Technol, CAS Ctr Excellence Nanosci, CAS Key Lab Nanosyst & Hierarch Fabricat, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China

[3] Tianjin Univ, Sch Sci, Key Lab Mol Optoelect Sci, Tianjin 300072, Peoples R China

[4] Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300072, Peoples R China

来源：

NANO RESEARCH | 2017年 / 10卷 / 04期

基金：

中国国家自然科学基金;

关键词：

nanocrystals; necking percolative superlattices; ligand; mobility; trap states; QUANTUM-DOT SOLIDS; FIELD-EFFECT TRANSISTORS; COLLOIDAL NANOCRYSTALS; CHARGE-TRANSPORT; SURFACE LIGANDS; POST-SYNTHESIS; SOLAR-CELLS; PHOTODETECTORS; MOBILITY; FILMS;

D O I：

10.1007/s12274-016-1351-z

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 NH4SCN (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.

引用

页码：1249 / 1257

页数：9