Equilibrium self-assembly of close-packed ordered PbTe nanocrystal thin film and near-infrared photoconductive detector
Equilibrium self-assembly of close-packed ordered PbTe nanocrystal thin film and near-infrared photoconductive detector
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DOI：
10.1039/c2jm00054g
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发表时间：
2012-04
影响因子：
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通讯作者：
Zhonghai Lin;Minqiang Wang;Liyuan Zhang;Yaohui Xue;X. Yao;Hao-Chun Cheng;J. Bai
中科院分区：
文献类型：
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作者：
Zhonghai Lin;Minqiang Wang;Liyuan Zhang;Yaohui Xue;X. Yao;Hao-Chun Cheng;J. Bai
用单分散的PbTe纳米晶(NCS)组装了一种具有近红外光导特性的PbTe薄膜。单分散PbTe纳米碳管通过快速注入液相合成法表现出很大的吸收可调性(~gt；400 nm)。为了在具有Ti/Au接触的Si/SiO_2衬底上获得光滑的紧密堆积的NC薄膜，采用了平衡自组装方法，该方法可以通过调节Ar气流的速度和蒸发温度来方便地控制。根据原子力显微镜(AFM)和扫描电子显微镜(SEM)的分析，提出了形成PbTe NC薄膜的PbTe NC组装工艺示意图。经乙二胺处理后的PbTe纳米薄膜表现出良好的光导增益。这一现象说明PbTe纳米薄膜具有近红外光电导特性。
A PbTe thin film with near-infrared photoconductive characteristics is assembled from monodisperse PbTe nanocrystals (NCs). Monodisperse PbTe NCs show large absorption tunability (>400 nm) by a rapid injection solution-phase synthesis route. In order to obtain smooth close-packed NC thin films on a Si/SiO2 substrate with Ti/Au contacts the equilibrium self-assembly method is employed, which is conveniently controlled by adjusting the velocity of the argon flow and the evaporation temperature. According to atomic force microscope (AFM) and scanning electron microscope (SEM) analysis, we propose a schematic diagram of the PbTe NC assembly process to form the PbTe NC film. The PbTe NC thin film exhibits a good photoconductive gain after ethylenediamine treatment. This phenomenon thus illustrates that the PbTe NC thin film has near-infrared photoconductive characteristics.