Quantum Dot Layer Fixing for Oxygen Degradation
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Solution Overview
Problem
Devices incorporating quantum dots face challenges related to lifetime and performance issues due to exposure to oxygen, which can degrade the quantum dot layers, affecting the efficiency and stability of devices such as light emitting devices, photovoltaic devices, and photodetectors.
Innovation Solution
A method involving the formation of a layer comprising quantum dots over a substrate with a first electrode, followed by fixing the layer in the absence of oxygen and exposing it to small molecules and light flux, which can include polar molecules like water or alcohols, to enhance the stability and performance of the quantum dot layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum dot layers are exposed to oxygen during device operation, then device functionality is maintained, but lifetime and performance degrade due to oxidation
Solution Approach 1:
The patent applies inert atmosphere by exposing quantum dot layers to controlled environments with reduced oxygen content (nitrogen or vacuum atmospheres) during fabrication and operation. This prevents oxidative degradation of the quantum dot material while maintaining device functionality, directly resolving the contradiction between device lifetime and oxygen exposure.
2Reliability
If quantum dot layers are sealed to prevent oxygen exposure, then lifetime is extended, but performance and efficiency decrease due to lack of environmental interaction
Solution Approach 1:
The patent applies local quality by creating selective permeability in the device structure - allowing beneficial environmental interactions (light, heat) while blocking harmful factors (oxygen). The quantum dot layer is exposed to controlled atmospheres that permit operational efficiency while preventing degradation, resolving the contradiction between lifetime extension and performance maintenance.
3Ease of operation
If quantum dot devices are operated in ambient conditions, then ease of operation is maintained, but performance stability deteriorates due to environmental variability
Solution Approach 1:
The patent applies parameter changes by controlling the atmospheric environment (oxygen partial pressure, humidity) during device operation. By adjusting these environmental parameters to optimal ranges, the device maintains both ease of operation and performance stability, resolving the contradiction between operational simplicity and compositional stability.
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
This method improves the external quantum efficiency and extends the lifetime of quantum dot-based devices by protecting the quantum dot layer from oxygen degradation and optimizing its performance attributes.
Implementation Method 1
a layer comprising quantum dots disposed between the electrodes
Implementation Method 2
exposing at least a portion of, and preferably all, exposed surfaces of the fixed layer comprising quantum dots to small molecules
Data Source
AI summary
A method of making a device comprises forming a layer comprising quantum dots over a substrate including a first electrode, fixing the layer comprising quantum dots formed over the substrate, and exposing at least a portion of, and preferably all, exposed surfaces of the fixed layer comprising quantum dots to small molecules. The layer comprising quantum dots can be preferably fixed in the absence or substantial absence of oxygen. Also disclosed is a method of making a device comprises forming a layer comprising quantum dots over a substrate including a first electrode, exposing the layer comprising quantum dots to small molecules and light flux. Also disclosed is a method of making a film including a layer comprising quantum dots, the method comprising forming a layer comprising quantum dots over a carrier substrate, fixing the layer comprising quantum dots formed over the carrier substrate, and exposing at least a portion of, and preferably all, exposed surfaces of the fixed layer comprising quantum dots to small molecules. The layer comprising quantum dots can be preferably fixed in the absence or substantial absence of oxygen. Also disclosed is a method of preparing a device component including a layer comprising quantum dots, the method comprising forming a layer comprising quantum dots over a layer comprising a charge transport material, exposing the layer comprising quantum dots to small molecules and light flux. Devices, device components, and films are also disclosed.