High Hole Mobility in Long‐Range Ordered 2D Lead Sulfide Nanocrystal Monolayer Films |
| |
| Authors: | Man Zhao Fangxu Yang Chao Liang Dawei Wang Defang Ding Jiawei Lv Jianqi Zhang Wenping Hu Chenguang Lu Zhiyong Tang |
| |
| Affiliation: | 1. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Zhongguancun, Beijing, P. R. China;2. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing, P. R. China;3. Department of Materials Physics and Chemistry, School of Materials and Engineering, Beijing University of Science and Technology, Haidian District, Beijing, P. R. China |
| |
| Abstract: | 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 cm2 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. |
| |
| Keywords: | carrier mobility nanocrystals self‐assembly surface passivation |
|
|
