Bodnarchuk Maryna I, Yakunin Sergii, Piveteau Laura, Kovalenko Maksym V
Laboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland.
Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
Nat Commun. 2015 Dec 9;6:10142. doi: 10.1038/ncomms10142.
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 × 10(11) 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.
用无机封端配体（如金属硫族化物配合物（MCCs））功能化的胶体无机纳米晶体（NCs），最近已成为多功能的光电子材料。刚制备出来时，带高电荷的MCC封端的NCs仅可分散于高极性溶剂中，并且缺乏形成长程有序NC超晶格的能力。在此我们报道一种简单通用的方法，该方法基于MCC封端的NCs与大环醚（冠醚和穴醚）的主客体配位，可使无机封端的NCs在任何极性的溶剂中溶解，并提高形成NC超晶格的能力。有机分子的冠层还可作为一个方便的旋钮，用于精细调节NCs薄膜中的电荷传输和光电导率。特别是，PbS/K3AsS4/癸基-18-冠-6 NCs薄膜在1200 nm波长处获得了高达3.3×10(11)琼斯的高红外光子探测率以及快速响应（3 kHz时3 dB截止）。
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