Room Temperature Mid-IR Detection through Localized Surface Vibrational States of SnTe Nanocrystals

被引:8
|
作者
Cryer, Matthew E. [1 ]
Halpert, Jonathan E. [1 ,2 ]
机构
[1] Victoria Univ Wellington, MacDiarmid Inst Adv Mat & Nanotechnol, Sch Chem & Phys Sci, POB 600, Wellington 6012, New Zealand
[2] Hong Kong Univ Sci & Technol, Dept Chem, Hong Kong, Hong Kong, Peoples R China
来源
ACS SENSORS | 2018年 / 3卷 / 10期
关键词
mid-infrared; nanocrystals; detection; surface states; device; QUANTUM-DOTS; ELECTRON-TRANSPORT; PLASMON RESONANCES; OPTICAL-PROPERTIES; COULOMB-BLOCKADE; HYDROXYL-GROUPS; SNO2; SENSORS; SEMICONDUCTOR; OXIDE; CO;
D O I
10.1021/acssensors.8b00448
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Quantum dots (QDs) are now well established as promising materials for room temperature mid-infrared (MIR) detection beyond 3 mu m. Here, we have replaced commonly reported mercury based quantum dots with less toxic SnTe and PbSnTe. Inverse MIR detection at room temperature is demonstrated with planar, solution, and air-processed PbSnTe and SnTe QD devices. The detection mechanism is shown to be mediated by an interaction between MIR radiation and the vibrational stretches of adsorbed hydroxyl species. Devices are shown to possess mA/W responsivity via a reduction in conductance due to MIR irradiation and, unlike classic MIR photoconductors, are unaffected by visible wavelengths. As such, these devices offer the possibility of MIR thermal imaging that has an intrinsic solution to the blinding caused by higher energy light sources.
引用
收藏
页码:2087 / 2094
页数:15
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