Quantum Dot Photoelectric Structure With Zirconium Oxide for PPC Control
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Solution Overview
Problem
Conventional photoelectric devices based on quantum dots face challenges with stability due to external oxygen and moisture exposure and suffer from reduced photoreactivity caused by ligands, as well as significant persistent photoconductivity (PPC) effects, limiting their use in next-generation electronic devices.
Innovation Solution
A photoelectric device structure incorporating a zirconium oxide layer stacked on a zinc oxide and quantum dots layer, where the zirconium oxide layer serves as a channel layer, enhancing stability and reducing PPC effects, achieved through a spin coating and heat treatment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If quantum dots are used to achieve transparency and adjust band gaps, then photoelectric performance is improved, but stability in the atmosphere deteriorates due to sensitivity to external oxygen and moisture
Solution Approach 1:
A zirconium oxide layer is formed as a protective shell around the quantum dots. This thin film structure isolates the quantum dots from external oxygen and moisture while maintaining their photoelectric properties, thereby improving atmospheric stability without compromising band gap adjustment capabilities
Solution Approach 2:
The patent creates a composite structure combining quantum dots with a zirconium oxide shell. This composite material approach allows the quantum dots to retain their tunable band gap properties while the zirconium oxide provides environmental stability, resolving the contradiction between versatility and reliability
2Reliability
If ligands are introduced to protect quantum dots from atmospheric degradation, then stability is improved, but photoreactivity deteriorates due to defects induced by ligands
Solution Approach 1:
The patent changes the protective approach from chemical ligands to a physical zirconium oxide shell. This parameter change in the protection mechanism eliminates the defects introduced by ligand bonding, thereby maintaining high photoreactivity while achieving atmospheric stability
Solution Approach 2:
The zirconium oxide layer acts as an intermediary between the quantum dots and the atmosphere. It provides protective isolation without introducing the harmful defects that ligands do, thus mediating between the need for stability and the need for photoreactivity
3Ease of manufacture
If conventional quantum dot structures are used, then manufacturing simplicity is maintained, but persistent photoconductivity effect increases, limiting use as photoelectric devices
Solution Approach 1:
The zirconium oxide shell formed around quantum dots acts as a barrier that prevents the harmful persistent photoconductivity effect while maintaining the simplicity of solution-based manufacturing processes. The shell structure is formed through straightforward coating techniques
Solution Approach 2:
The patent converts the potential harm of persistent photoconductivity into a benefit by using the zirconium oxide shell to control and reduce this effect. The shell structure, formed through simple processing, transforms the harmful PPC effect into a manageable characteristic that enables photoelectric device operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device exhibits improved stability, high photoresponsivity, and reduced PPC effects, enabling long-term operation and selective light detection in multiple wavelength regions, with enhanced electrical characteristics and increased durability.
Implementation Method 1
a zirconium oxide layer stacked on the QDs layer. The zirconium oxide layer enables the photoelectric device to serve as a color selective image sensor
Implementation Method 2
A photo sensor is a device that absorbs light of various wavelengths and converts it into an electrical signal
Implementation Method 3
The zirconium oxide layer may serve as a channel layer and provides a high sensitivity of 6.67×105 and a photoresponsivity of 0.81 A/W
Data Source
AI summary
The present disclosure relates to a photoelectric device based on quantum dots with a zirconium oxide layer and its manufacturing method. A photoelectric device according to the present disclosure includes a substrate; a zinc oxide layer stacked on the substrate; a quantum dots (QDs) layer stacked on the zinc oxide layer; and a zirconium oxide layer stacked on the QDs layer. According to the present disclosure, the zirconium oxide layer further formed in the photoelectric device may enable the photoelectric device to operate as a color selective image sensor that selectively detect light in multiple wavelength regions using only quantum dots of a single wavelength.