Structural, optical and electrical properties of self-assembled films of PbSe nanocrystals treated with 1,2-ethanedithiol
Structural, optical and electrical properties of self-assembled films of PbSe nanocrystals treated with 1,2-ethanedithiol
复制标题
DOI：
10.1021/nn7003348
复制
发表时间：
2008-02-01
期刊：
影响因子：
17.1
通讯作者：
Nozik, Arthur J.
中科院分区：
文献类型：
--
作者：
Luther, Joseph M.;Law, Matt;Nozik, Arthur J.
我们描述的结构，光学和电学性能的高品质的PbSe纳米晶体薄膜制造的逐层（LBL）浸涂方法，利用1，2-乙二硫醇（EDT）作为不溶性试剂。通过旋涂和LBL工艺制成的PERFORMANCE膜的比较表征表明，EDT定量取代PbSe表面上的油酸，导致大的体积损失，电子耦合的纳米晶体，同时严重降低其位置和晶体顺序的膜。基于EDT处理薄膜的场效应晶体管在黑暗中具有中等导电性和双极性，在300 mW cm（-2）宽带照明下变成p型，导电性提高30-60倍。在短时间的空气暴露后，该薄膜在空气中迅速氧化，产生高导电性的p型固体。这里描述的LbL工艺是用于生产用于光电子和太阳能转换的均匀的、导电的薄膜的一般策略。
We describe the structural, optical, and electrical properties of high-quality films of PbSe nanocrystals fabricated by a layer-by-layer (LbL) dip-coating method that utilizes 1,2-ethanedithiol (EDT) as an insolubilizing agent. Comparative characterization of nanocrystal films made by spin-coating and by the LbL process shows that EDT quantitatively displaces oleic acid on the PbSe surface, causing a large volume loss that electronically couples the nanocrystals while severely degrading their positional and crystallographic order of the films. Field-effect transistors based on EDT-treated films are moderately conductive and ambipolar in the dark, becoming p-type and 30-60 times more conductive under 300 mW cm(-2) broadband illumination. The nanocrystal films oxidize rapidly in air to yield, after short air exposures, highly conductive p-type solids. The LbL process described here is a general strategy for producing uniform, conductive nanocrystal films for applications in optoelectronics and solar energy conversion.