Perovskite Multiple Quantum Wells for Efficiency and Stability
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Solution Overview
Problem
Current perovskite materials for optoelectronic devices face challenges with low photoluminescence quantum efficiency and stability, particularly in two-dimensional layered films, which limit the performance of light-emitting and photovoltaic devices.
Innovation Solution
A perovskite optoelectronic device with a self-organized multiple quantum well structure is developed, utilizing a perovskite material prepared from specific organic and metallic components, allowing for adjustable energy gaps and effective energy transfer between quantum wells, enhancing light emission efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 3D perovskite material is used, then photoluminescence quantum efficiency is improved, but film stability deteriorates
Solution Approach 1:
The patent segments the perovskite structure into a self-organized multiple quantum well structure with alternating organic-inorganic layers. This segmentation creates discrete quantum wells that maintain the high photoluminescence quantum efficiency of 3D perovskite while the organic spacer layers provide structural stability and prevent degradation, thus resolving the contradiction between efficiency and stability.
Solution Approach 2:
The patent employs composite materials by combining organic cations (R1-Y+) with inorganic perovskite layers (BX2 and MX32) to form a hybrid quantum well structure. This composite approach leverages the optical advantages of inorganic perovskite for high photoluminescence quantum efficiency while the organic components provide enhanced stability and processability, simultaneously addressing both requirements.
2Stability of the object's composition
If two-dimensional layered perovskite film is used, then film stability is improved, but photoluminescence quantum efficiency deteriorates
Solution Approach 1:
The patent changes the structural parameters by creating a self-organized multiple quantum well structure with controlled well widths and barrier heights. By adjusting the thickness of organic and inorganic layers, the quantum confinement effects are optimized to achieve high photoluminescence quantum efficiency while maintaining the stability advantages of layered structures, thus overcoming the limitations of conventional two-dimensional perovskite.
3Reliability
If conventional perovskite material is used, then device performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent utilizes self-service by employing solution-based processing methods that allow the perovskite quantum well structures to self-assemble and self-organize during fabrication. This eliminates the need for complex vacuum deposition equipment and multiple fabrication steps, enabling low-cost large-area manufacturing while maintaining high device performance through the inherent self-organizing capability of the quantum well structure.
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 solution significantly improves the luminous efficiency and lifetime of light-emitting devices and the open circuit voltage and power conversion efficiency of photovoltaic devices, while being suitable for industrial-scale production with a low-cost, large-area, and flexible substrate process.
Implementation Method 1
energy transfers can be implemented between the multiple quantum wells
Implementation Method 2
the photoluminescence quantum efficiency thereof is as high as 70%, and the light emitting wavelength can be adjusted through an energy band engineering
Data Source
AI summary
It discloses a perovskite optoelectronic device which includes a substrate, electrode layers and functional layers. The electrode layer is deposited on the substrate, the functional layer is deposited between the electrode layers, and the functional layer at least includes a perovskite layer, wherein the perovskite layer is a perovskite material possessing a self-organized multiple quantum well structure. By adjusting material components, controllable adjustment of the structure of the multiple quantum wells and effective energy transfer between the multiple quantum wells can be implemented, and light emitting color may be near-ultraviolet light, visible light and near-infrared light; moreover, the problems of low coverage and poor stability of the existing perovskite films can be effectively solved.