Influence of TOPO and TOPO-CdSe/ZnS Quantum Dots on Luminescence Photodynamics of InP/InAsP/InPHeterostructure Nanowires

Nanomaterials

ArtemI. Khrebtov¹  AnastasiaS. Kulagina¹  RodionR. Reznik¹  StanislavV. Shmakov¹  DmitriyS. Shevchuk¹  GeorgeE. Cirlin¹  VladimirV. Danilov²  IvanD. Skurlov³  AlexanderP. Litvin³  FarrukhM. Safin³  ArtemN. Yablonskiy⁴  VladislavO. Gridchin⁵ 

[1] Alferov University, Khlopinast. 8/3, 194021 St. Petersburg, Russia;Emperor Alexander I St. Petersburg State Transport University, Moskovsky pr. 9, 191031 St. Petersburg, Russia;ITMO University, Kronverkskiy pr. 49, 197101 St. Petersburg, Russia;Institute for Physics of Microstructures RAS, GSP-105, Academicheskayast. 7, Afonino, 603950 Nizhny Novgorod, Russia;St. Petersburg State University, Ulyanovskayast. 1, Peterhof, 198504 St. Petersburg, Russia;

关键词: nanowires;    TOPO ligands;    molecular-beam epitaxy;    luminescence kinetics;    reverse transfer;   

DOI  :  10.3390/nano11030640

来源: DOAJ

【 摘 要 】

The passivation influence by ligands coverage with trioctylphosphine oxide (TOPO) and TOPO including colloidal CdSe/ZnS quantum dots (QDs) on optical properties of the semiconductor heterostructure, namely an array of InP nanowires (NWs) with InAsP nanoinsertion grown by Au-assisted molecular beam epitaxy on Si (111) substrates, was investigated. A significant dependence of the photoluminescence (PL) dynamics of the InAsP insertions on the ligand type was shown, which was associated with the changes in the excitation translation channels in the heterostructure. This change was caused by a different interaction of the ligand shells with the surface of InP NWs, which led to the formation of different interfacial low-energy states at the NW-ligand boundary, such as surface-localized antibonding orbitals and hybridized states that were energetically close to the radiating state and participate in the transfer of excitation. It was shown that the quenching of excited states associated with the capture of excitation to interfacial low-energy traps was compensated by the increasing role of the “reverse transfer” mechanism. As a result, the effectiveness of TOPO-CdSe/ZnS QDs as a novel surface passivation coating was demonstrated.

【 授权许可】

Unknown