High Hole Mobility in Long-Range Ordered 2D Lead Sulfide Nanocrystal Monolayer Films

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• 作者：Man Zhao ; Fangxu Yang ; Chao Liang ; Dawei Wang ; Defang Ding ; Jiawei Lv ; Jianqi Zhang ; Wenping Hu ; Chenguang Lu and Zhiyong Tang
• 刊名：Advanced Functional Materials
• 出版年：2016
• 出版时间：July 25, 2016
• 年：2016
• 卷：26
• 期：28
• 页码：5182-5188
• 全文大小：1766K
• ISSN：1616-3028

文摘

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.