naa a22 4500 530097605 20181026074607.0 cr unu---uuuuu 181026e201809 xx s 000 0 eng 10.3929/ethz-b-000292762 doi 10.1002/adma.201802265 doi (ETHRESEARCH)oai:www.research-collection.ethz.ch:20.500.11850/292762 Electron Mobility of 24 cm2 V−1 s−1 in PbSe Colloidal‐Quantum‐Dot Superlattices [Elektronische Daten] [Daniel M. Balazs, Bartosz M. Matysiak, Jamo Momand, Artem G. Shulga, Maria Ibáñez, Maksym V. Kovalenko, Bart J. Kooi, Maria A. Loi] Adv Mater Open access ethresearch Colloidal quantum dots (CQDs) are nanoscale building blocks for bottom‐up fabrication of semiconducting solids with tailorable properties beyond the possibilities of bulk materials. Achieving ordered, macroscopic crystal‐like assemblies has been in the focus of researchers for years, since it would allow exploitation of the quantum‐confinement‐based electronic properties with tunable dimensionality. Lead‐chalcogenide CQDs show especially strong tendencies to self‐organize into 2D superlattices with micrometer‐scale order, making the array fabrication fairly simple. However, most studies concentrate on the fundamentals of the assembly process, and none have investigated the electronic properties and their dependence on the nanoscale structure induced by different ligands. Here, it is discussed how different chemical treatments on the initial superlattices affect the nanostructure, the optical, and the electronic‐transport properties. Transistors with average two‐terminal electron mobilities of 13 cm2 V−1 s−1 and contactless mobility of 24 cm2 V−1 s−1 are obtained for small‐area superlattice field‐effect transistors. Such mobility values are the highest reported for CQD devices wherein the quantum confinement is substantially present and are comparable to those reported for heavy sintering. The considerable mobility with the simultaneous preservation of the optical bandgap displays the vast potential of colloidal QD superlattices for optoelectronic applications. Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0 ethresearch Balazs Daniel M. joint author Matysiak Bartosz M. joint author Momand Jamo joint author Shulga Artem G. joint author Ibáñez Maria joint author Kovalenko Maksym V. joint author Kooi Bart J. joint author Loi Maria A. joint author Advanced Materials Weinheim : Wiley 30 (38), p. 1802265 0935-9648 http://hdl.handle.net/20.500.11850/292762 text/html WWW-Backlink auf das Repository (Open access) 1 Journal Article ethresearch ETHRESEARCH 856 40 http://hdl.handle.net/20.500.11850/292762 text/html WWW-Backlink auf das Repository (Open access) ETHRESEARCH 700 1- Balazs Daniel M. joint author ETHRESEARCH 700 1- Matysiak Bartosz M. joint author ETHRESEARCH 700 1- Momand Jamo joint author ETHRESEARCH 700 1- Shulga Artem G. joint author ETHRESEARCH 700 1- Ibáñez Maria joint author ETHRESEARCH 700 1- Kovalenko Maksym V. joint author ETHRESEARCH 700 1- Kooi Bart J. joint author ETHRESEARCH 700 1- Loi Maria A. joint author ETHRESEARCH 773 0- Advanced Materials Weinheim : Wiley 30 (38), p. 1802265 0935-9648 BK010053 XK010053 XK010000 ETHRESEARCH ETHRESEARCH ETHRESEARCH Journal Article Open access