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[资源] nature nanotechnology最新增强CdS太阳能器件或显示器材料中电子流动性

Flexible, thin-film electronic and optoelectronic devices typically
involve a trade-off between performance and fabrication
cost1–3. 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 solutiondeposited
semiconductor layers is much lower than in semiconductors
grown at high temperatures from the gas phase4. Here,
we report band-like electron transport in arrays of colloidal
cadmium selenide nanocrystals capped with the molecular
metal chalcogenide complex5,6 In2Se4
22, and measure electron
mobilities as high as 16 cm2 V21 s21, which is about an order of
magnitude higher than in the best solution-processed organic7
and nanocrystal8 devices so far. We also use CdSe/CdS core–
shell nanoparticles with In2Se4
22 ligands to build photodetectors
with normalized detectivity D* > 131013 Jones
(I Jones51 cmHz1/2 W21), 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.

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