Photoluminescence Lifetime Based Investigations of Linker Mediated Electronic Connectivity Between Substrate and Nanoparticle

Abstract

The evolution of systems based on nanoparticles as the main component seems to be a self-accelerating process during the last five decades. Hence, an overview across this field gets more and more challenging. It is sometimes rewarding to focus on the fundamental physical phenomenon of the electronic interconnection between the different building blocks of the obtained devices. Therefore, the investigation of charge transport among the utilized particles and their substrate is one of the mandatory steps in the development of semiconductor nanoparticle based devices like e.g., sensors and LEDs. The investigation of the influence of tunneling barriers on the properties of nanoparticle-functionalized surfaces is a challenging task. The different basic influences on the charge transport dynamics are often difficult to separate from each other. Non-invasive and easily viable experiments are still required to resolve the charge distributing mechanisms in the systems. In the presented work, we want to focus on thin and transparent indium tin oxide (ITO) layers covered glass slides since this substrate is frequently utilized in nanoelectronics. CdSe/CdS nanorods (NRs) are applied as an optically addressable probe for the electronic surface states of the conductive glass. The presented experimental design provides the proof of electronic interconnections in ITO coated glass/linker/NR electrodes via easy reproducible functionalization and polishing experiments. UV/Vis absorption and photoluminescence (PL) lifetime measurements revealed changes in the optical properties caused by differences in the charge carrier dynamics between the system. Our work is focused on the modification of charge carrier dynamics due to the application of linker molecules with different functional groups like (3-mercaptopropyl)methoxysilane (MPTMS) and (3-aminopropyl)trimethoxysilane (APTMS). The presented observations are explained with a simple kinetic model.

Flexible hybrid photodetector based on silver sulfide nanoparticles and multi-walled carbon nanotubes

“…4(d)). 42 This result demonstrates the good mechanical stability of the devices owing to the superior mechanical exibility characteristic of CNTs. This approach, thus, may pave the way forward for the fabrication of advanced exible photoelectronic devices.…”

Revealing the Correlation of the Electrochemical Properties and the Hydration of Inkjet-Printed CdSe/CdS Semiconductor Gels

“…The layer of nanorods directly connected to the substrate via MPTMS has the highest intrinsic photocurrent quantum efficiency of all particles in the gel sample. This is explainable with the related mechanism of the charge transport, which requires the least number of steps . This first category of NRs in the systems provides negative and positive photocurrents at the chosen pH level .…”

“…steps. 37 This first category of NRs in the systems provides negative and positive photocurrents at the chosen pH level. 31 The generation of negative photocurrent is only hardly possible in the case of NRs, which are connected indirectly to the ITO substrate via linking to other NRs.…”