scholarly journals Monolayer Quantum-Dot Based Light-Sensor by a Photo-Electrochemical Mechanism

Micromachines ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 817
Author(s):  
Sitansu Sekhar Nanda ◽  
Minjik Kim ◽  
Sung Jong Yoo ◽  
Georgia C. Papaefthymiou ◽  
Dong Kee Yi
Keyword(s):  
Quantum Dots ◽  
Cyclic Voltammetry ◽  
Quantum Dot ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Photocurrent Density ◽  
Light Illumination ◽  
Indium Tin Oxide Electrode ◽  
Photo Sensor ◽  
Cadmium Selenium

Monolayer nanocrystal-based light sensors with cadmium-selenium thin film electrodes have been investigated using electrochemical cyclic voltammetry tests. An indium tin oxide electrode system, with a monolayer of homogeneously deposited cadmium-selenium quantum dots was proven to work as a photo-sensor via an electrochemical cell mechanism; it was possible to tune current densities under light illumination. Electrochemical tests on a quantum dot capacitor, using different sized (red, yellow and green) cadmium-selenium quantum dots on indium tin oxide substrates, showed typical capacitive behavior of cyclic voltammetry curves in 2M H2SO4 aqueous solutions. This arrangement provides a beneficial effect in, both, charge separation and light sensory characteristics. Importantly, the photocurrent density depended on quantum yield rendering tunable photo-sensing properties.

scholarly journals Semiconductor quantum dot-sensitized rainbow photocathode for effective photoelectrochemical hydrogen generation

2017 ◽  
Vol 114 (43) ◽  
pp. 11297-11302 ◽  
Author(s):  
Hongjin Lv ◽  
Congcong Wang ◽  
Guocan Li ◽  
Rebeckah Burke ◽  
Todd D. Krauss ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Indium Tin Oxide ◽  
Spin Coating ◽  
Charge Separation ◽  
Hydrogen Generation ◽  
Present Report ◽  
Photocurrent Density ◽  
Light Illumination ◽  
Faradaic Efficiency ◽  
Coating Method

The present study reports the fabrication of CdSe quantum dot (QD)-sensitized photocathodes on NiO-coated indium tin oxide (ITO) electrodes and their H2-generating ability upon light irradiation. A well-established spin-coating method was used to deposit CdSe QD stock solution onto the surface of NiO/ITO electrodes, thereby leading to the construction of various CdSe QD-sensitized photocathodes. The present report includes the construction of rainbow photocathodes by spin-coating different-sized QDs in a sequentially layered manner, thereby creating an energetically favorable gradient for charge separation. The resulting rainbow photocathodes with forward energetic gradient for charge separation and subsequent electron transfer to a solution-based hydrogen-evolving catalyst (HEC) exhibit good light-harvesting ability and enhanced photoresponses compared with the reverse rainbow photocathodes under white LED light illumination. Under minimally optimized conditions, a photocurrent density of as high as 115 μA⋅cm−2 and a Faradaic efficiency of 99.5% are achieved, which is among the most effective QD-based photocathode water-splitting systems.

Electrochemical Eu(III)/Eu(II) behaviors and recovery over terpyridyl-derivatized modified indium tin oxide electrode surfaces

2021 ◽  
Vol 412 ◽  
pp. 128717
Author(s):  
So Jeong Park ◽  
Min Hee Joo ◽  
Sung-Min Hong ◽  
Choong Kyun Rhee ◽  
Jun-Gill Kang ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Oxide Electrode ◽  
Indium Tin Oxide Electrode ◽  
Electrode Surfaces

scholarly journals Performance of GaN-Based LEDs with Nanopatterned Indium Tin Oxide Electrode

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
Zhanxu Chen ◽  
Wenjie Liu ◽  
Wei Wan ◽  
Gengyan Chen ◽  
Yongzhu Chen ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Ohmic Contacts ◽  
Three Dimensional ◽  
Light Output ◽  
Light Extraction Efficiency ◽  
Experimental Result ◽  
Indium Tin Oxide Electrode ◽  
Light Emitting ◽  
Ito Electrode

The indium tin oxide (ITO) has been widely applied in light emitting diodes (LEDs) as the transparent current spreading layer. In this work, the performance of GaN-based blue light LEDs with nanopatterned ITO electrode is investigated. Periodic nanopillar ITO arrays are fabricated by inductive coupled plasma etching with the mask of polystyrene nanosphere. The light extraction efficiency (LEE) of LEDs can be improved by nanopatterned ITO ohmic contacts. The light output intensity of the fabricated LEDs with nanopatterned ITO electrode is 17% higher than that of the conventional LEDs at an injection current of 100 mA. Three-dimensional finite difference time domain simulation matches well with the experimental result. This method may serve as a practical approach to improving the LEE of the LEDs.

Ag Doped Zinc Tin Oxide as Cathode for Organic Photovoltaic Cells

2012 ◽  
Vol 209-211 ◽  
pp. 1719-1722
Author(s):  
Ming Guo Zhang ◽  
Nan Hai Sun
Keyword(s):  
Solar Cells ◽  
Tin Oxide ◽  
Organic Solar Cells ◽  
Indium Tin Oxide ◽  
Bulk Heterojunction ◽  
Indium Tin Oxide Electrode ◽  
Heterojunction Solar Cells ◽  
Visible Part ◽  
Cell Architecture ◽  
Zinc Tin Oxide

A thin Ag layer embedded between layers of zinc tin oxide (ZTO) are compared to cells using an indium tin oxide electrode was investigated for inverted organic bulk heterojunction solar cells employing a multilayer electrode. ZTO/Ag/ ZTO (ZAZ) electrode is the preparation at room temperature, a high transparency in the visible part of the spectrum, and a very low sheet resistance comparable to treated ITO without the need for any thermal post deposition treatment as it is necessary for ITO. The In-free ZAZ electrodes exhibit a favorable work function of 4.3 eV and are shown to allow for excellent electron extraction even without a further interlayer. This renders ZAZ a perfectly suited bottom electrode for inverted organic solar cells with simplified cell architecture.

Effective oxygen plasma treatment on indium tin oxide electrode to improve organic solar cell efficiency

2011 ◽  
Vol 209 (2) ◽  
pp. 369-372 ◽  
Author(s):  
Fu-Ching Tang ◽  
Jay Chang ◽  
Wei-Yang Chou ◽  
Horng-Long Cheng ◽  
Steve Lien-Chung Hsu ◽  
...  
Keyword(s):  
Solar Cell ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Organic Solar Cell ◽  
Oxygen Plasma ◽  
Oxygen Plasma Treatment ◽  
Oxide Electrode ◽  
Indium Tin Oxide Electrode ◽  
Solar Cell Efficiency ◽  
Cell Efficiency
Sign in / Sign up

Export Citation Format

Share Document