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Strategies for enhancing conductivity of colloidal nanocrystals and their photoelectronic applications

Journal of Energy Chemistry 2020年第9期29卷 29-42,I0002页

作者： Fen Qiao Yi Xie School of Energy&Power Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070HubeiChina

Semiconductor colloidal nanocrystals(NCs)have size-and shape-dependent optoelectronic properties due to the quantum confinement effect,and are considered to be promising optoelectronic *** them,Ⅱ-Ⅵ(CdSe,CdS,CdTe,etc.)andⅣ-Ⅵ(PbSe,PbTe,PbS,etc.)have been widely studied as representative colloidal ***,the surfactant used in its synthesis progress results in the NCs surface covered by an insulating shell,which greatly affects the exciton separation and carrier transport of colloidal NCs-based photovoltaic ***,how to design high-efficiency optoelectronic devices by improving the transport performance of carriers has been a great *** key issues in the research ofⅡ-Ⅵ(CdSe,CdS,CdTe,etc.)andⅣ-Ⅵ(PbSe,PbTe,PbS,etc.)colloidal NCs were summarized,including synthesis strategy,morphology/size adjustment,surface ligand design,improvement of conductivity and their optoelectronic *** influence of surface ligands on the stability and dispersion of NCs was firstly introduced,and then strategies of improving electrical conductivity of NCs were discussed,such as ligands exchange,doping,self-assembly and plasmons,which provided a good foundation for the subsequent preparation of optoelectronic *** future development direction of NCs optoelectronic devices is expounded from the aspects of materials composition,comprehensive preparation and flexible processing of colloidal NCs.

关键词： colloidal nanocrystal Surface engineering Conductivity Photoelectronic device

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Inkjet printing of epitaxially connected nanocrystal superlattices

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Nano Research 2022年第5期15卷 4536-4543页

作者： Daniel M.Balazs NDeniz Erkan Michelle Quien Tobias Hanrath School of Chemical and Biomolecular Engineering Cornell UniversityIthacaNYUSA Institute of Science and Technology Austria Am Campus 1Klosterneuburg 3400Austria

Access to a blossoming library of colloidal nanomaterials provides building blocks for complex assembled *** journey to bring these prospects to fruition stands to benefit from the application of advanced processing *** connected nanocrystal(or quantum dot)superlattices present a captivating model system for mesocrystals with intriguing emergent *** conventional processing approach to creating these materials involves assembling and attaching the constituent nanocrystals at the interface between two immiscible *** small liquid volumes of the colloidal nanocrystal solution involves several complexities arising from the concurrent spreading,evaporation,assembly,and *** ability of inkjet printers to deliver small(typically picoliter)liquid volumes with precise positioning is attractive to advance fundamental insights into the processing science,and thereby potentially enable new routes to incorporate the epitaxially connected superlattices into technology *** this study,we identified the processing window of opportunity,including nanocrystal ink formulation and printing approach to enable delivery of colloidal nanocrystals from an inkjet nozzle onto the surface of a sessile droplet of the immiscible *** demonstrate how inkjet printing can be scaled-down to enable the fabrication of epitaxially connected superlattices on patterned sub-millimeter *** anticipate that insights from this work will spur on future advances to enable more mechanistic insights into the assembly processes and new avenues to create high-fidelity superlattices.

关键词： interfacial assembly colloidal nanocrystal superlattice inkjet printing

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