Miranti, Retno; Septianto, Ricky Dwi; Ibanez Sabate, MariaIST Austria ; Kovalenko, Maksym V.; Matsushita, Nobuhiro; Iwasa, Yoshihiro; Bisri, Satria Zulkarnaen
Research in the field of colloidal semiconductor nanocrystals (NCs) has progressed tremendously, mostly because of their exceptional optoelectronic properties. Core@shell NCs, in which one or more inorganic layers overcoat individual NCs, recently received significant attention due to their remarkable optical characteristics. Reduced Auger recombination, suppressed blinking, and enhanced carrier multiplication are among the merits of core@shell NCs. Despite their importance in device development, the influence of the shell and the surface modification of the core@shell NC assemblies on the charge carrier transport remains a pertinent research objective. Type-II PbTe@PbS core@shell NCs, in which exclusive electron transport was demonstrated, still exhibit instability of their electron ransport. Here, we demonstrate the enhancement of electron transport and stability in PbTe@PbS core@shell NC assemblies using iodide as a surface passivating ligand. The combination of the PbS shelling and the use of the iodide ligand contributes to the addition of one mobile electron for each core@shell NC. Furthermore, both electron mobility and on/off current modulation ratio values of the core@shell NC field-effect transistor are steady with the usage of iodide. Excellent stability in these exclusively electron-transporting core@shell NCs paves the way for their utilization in electronic devices.
Applied Physics Letters
This work was partly supported by Grants-in-Aid for Scientific Research by Young Scientist A (KAKENHI Wakate-A) No. JP17H04802, Grants-in-Aid for Scientific Research No. JP19H05602 from the Japan Society for the Promotion of Science, and RIKEN Incentive Research Grant (Shoreikadai) 2016. M.V.K. and M.I. acknowledge financial support from the European Union (EU) via FP7 ERC Starting Grant 2012 (Project NANOSOLID, GA No. 306733) and ETH Zurich via ETH career seed grant (No. SEED-18 16-2). We acknowledge Mrs. T. Kikitsu and Dr. D. Hashizume (RIKEN-CEMS) for access to the transmission electron microscope facility.
Miranti R, Septianto RD, Ibáñez M, et al. Electron transport in iodide-capped core@shell PbTe@PbS colloidal nanocrystal solids. Applied Physics Letters. 2020;117(17). doi:10.1063/5.0025965
Miranti, R., Septianto, R. D., Ibáñez, M., Kovalenko, M. V., Matsushita, N., Iwasa, Y., & Bisri, S. Z. (2020). Electron transport in iodide-capped core@shell PbTe@PbS colloidal nanocrystal solids. Applied Physics Letters. AIP Publishing. https://doi.org/10.1063/5.0025965
Miranti, Retno, Ricky Dwi Septianto, Maria Ibáñez, Maksym V. Kovalenko, Nobuhiro Matsushita, Yoshihiro Iwasa, and Satria Zulkarnaen Bisri. “Electron Transport in Iodide-Capped Core@shell PbTe@PbS Colloidal Nanocrystal Solids.” Applied Physics Letters. AIP Publishing, 2020. https://doi.org/10.1063/5.0025965.
R. Miranti et al., “Electron transport in iodide-capped core@shell PbTe@PbS colloidal nanocrystal solids,” Applied Physics Letters, vol. 117, no. 17. AIP Publishing, 2020.
Miranti R, Septianto RD, Ibáñez M, Kovalenko MV, Matsushita N, Iwasa Y, Bisri SZ. 2020. Electron transport in iodide-capped core@shell PbTe@PbS colloidal nanocrystal solids. Applied Physics Letters. 117(17), 173101.
Miranti, Retno, et al. “Electron Transport in Iodide-Capped Core@shell PbTe@PbS Colloidal Nanocrystal Solids.” Applied Physics Letters, vol. 117, no. 17, 173101, AIP Publishing, 2020, doi:10.1063/5.0025965.