Band-like transport, high electron mobility and high photoconductivity in all-inorganic nanocrystal arrays
Band-like transport, high electron mobility and high photoconductivity in all-inorganic nanocrystal arrays
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DOI：
10.1038/nnano.2011.46
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发表时间：
2011-06-01
影响因子：
38.3
通讯作者：
Talapin, Dmitri V.
中科院分区：
文献类型：
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作者：
Lee, Jong-Soo;Kovalenko, Maksym V.;Talapin, Dmitri V.
柔性薄膜电子和光电设备通常需要在性能和制造成本之间进行权衡(1-3)。例如，基于溶液的沉积允许将半导体图案化在大面积衬底上，以制造太阳能电池和显示器，但溶液沉积半导体层中的电子迁移率远低于在高温下从气相中生长的半导体(4)。在这里，我们报道了分子金属硫系络合物(5，6)In(2)Se(4)(2-)包覆的胶体硒镉纳米晶阵列中的带状电子输运，测得电子迁移率高达16 cm(2)V(-1)S(-1)，比迄今为止最好的溶液处理有机(7)和纳米晶体(8)器件高出一个数量级。我们还使用带有In(2)Se(4)(2-)配体的CdSe/CDS核壳纳米粒子构建了归一化探测率D*>；1×10(13)Jones(i Jones=1 cm Hz(1/2)W(-1))的光电探测器，这是II-VI纳米晶体的记录。我们的方法不需要很高的加工温度，并且可以扩展到不同的纳米晶体和无机表面配体。
Flexible, thin-film electronic and optoelectronic devices typically involve a trade-off between performance and fabrication cost(1-3). For example, solution-based deposition allows semiconductors to be patterned onto large-area substrates to make solar cells and displays, but the electron mobility in solution-deposited semiconductor layers is much lower than in semiconductors grown at high temperatures from the gas phase(4). Here, we report band-like electron transport in arrays of colloidal cadmium selenide nanocrystals capped with the molecular metal chalcogenide complex(5,6) In(2)Se(4)(2-), and measure electron mobilities as high as 16 cm(2) V(-1) s(-1), which is about an order of magnitude higher than in the best solution-processed organic(7) and nanocrystal(8) devices so far. We also use CdSe/CdS core-shell nanoparticles with In(2)Se(4)(2-) ligands to build photodetectors with normalized detectivity D* > 1 x 10(13) Jones (I Jones = 1 cm Hz(1/2) W(-1)), which is a record for II-VI nanocrystals. Our approach does not require high processing temperatures, and can be extended to different nanocrystals and inorganic surface ligands.