Host–guest chemistry for tuning colloidal solubility, self-organization and photoconductivity of inorganic-capped nanocrystals

Maryna I. Bodnarchuk (), Sergii Yakunin, Laura Piveteau and Maksym V. Kovalenko ()
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Maryna I. Bodnarchuk: Laboratory of Inorganic Chemistry, ETH Zürich
Sergii Yakunin: Laboratory of Inorganic Chemistry, ETH Zürich
Laura Piveteau: Laboratory of Inorganic Chemistry, ETH Zürich
Maksym V. Kovalenko: Laboratory of Inorganic Chemistry, ETH Zürich

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Colloidal inorganic nanocrystals (NCs), functionalized with inorganic capping ligands, such as metal chalcogenide complexes (MCCs), have recently emerged as versatile optoelectronic materials. As-prepared, highly charged MCC-capped NCs are dispersible only in highly polar solvents, and lack the ability to form long-range ordered NC superlattices. Here we report a simple and general methodology, based on host–guest coordination of MCC-capped NCs with macrocyclic ethers (crown ethers and cryptands), enabling the solubilization of inorganic-capped NCs in solvents of any polarity and improving the ability to form NC superlattices. The corona of organic molecules can also serve as a convenient knob for the fine adjustment of charge transport and photoconductivity in films of NCs. In particular, high-infrared-photon detectivities of up to 3.3 × 1011 Jones with a fast response (3 dB cut-off at 3 kHz) at the wavelength of 1,200 nm were obtained with films of PbS/K3AsS4/decyl-18-crown-6 NCs.

Date: 2015
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DOI: 10.1038/ncomms10142

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