Perovskite Light Emitting Layer with Controlled Crystal Phase Ratios
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Solution Overview
Problem
Existing perovskite-based light emitting devices face challenges in controlling crystal phase ratios, achieving uniform thickness and density, and maintaining high phase uniformity, which affect light emission efficiency and color purity, especially in large-area applications.
Innovation Solution
A method for manufacturing perovskite powder using CsX and BX2 precursors, followed by vapor deposition to form a light emitting layer with controlled crystal phases and grain sizes, utilizing a single-source deposition source to adjust phase ratios and prevent pyrolysis, and incorporating scaffold layers for self-assembly and uniform film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solution process-based perovskite light emitting layer is used, then ease of manufacture is improved, but manufacturing precision deteriorates due to poor reproducibility and difficulty in thickness adjustment
Solution Approach 1:
The patent replaces the solution-based chemical deposition process with a physical vapor deposition process. Perovskite powder is heated in a vacuum environment to deposit the light emitting layer, eliminating the need for liquid precursors and chemical reactions. This substitution enables precise control of film thickness through deposition time and temperature while maintaining ease of manufacture by using standard vacuum deposition equipment.
Solution Approach 2:
The patent changes the fundamental deposition parameters from solution-based chemical concentration and spin-coating speed to physical vapor deposition parameters including heating temperature (500-700°C), vacuum pressure, and deposition time. These parameter changes enable precise control of film thickness and morphology while improving reproducibility across different manufacturing batches.
2Productivity
If dry deposition method is used for large-area manufacturing, then productivity is improved, but device complexity increases due to vacuum equipment requirements
Solution Approach 1:
The patent makes the vacuum deposition equipment multi-functional by using it for both perovskite powder synthesis and light emitting layer deposition in the same chamber. This eliminates the need for separate synthesis and deposition equipment, reducing overall device complexity while maintaining high productivity through continuous processing.
Solution Approach 2:
The patent performs perovskite powder synthesis in advance within the vacuum chamber before deposition. The synthesized powder is then directly used as the deposition source without requiring external preparation, streamlining the manufacturing process and reducing equipment complexity.
3Manufacturing precision
If perovskite powder with small crystal size is used, then manufacturing precision is improved through better phase uniformity, but light emission efficiency deteriorates due to reduced exciton confinement
Solution Approach 1:
The patent optimizes the heating temperature parameter during vapor deposition to control crystal grain growth. By maintaining temperature in the range of 500-700°C, the process produces powder with crystal sizes of 1-10 μm, which provides both sufficient phase uniformity for manufacturing precision and adequate exciton confinement for high light emission efficiency.
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 method enables high phase uniformity and efficient light emission with enhanced exciton confinement, improved electron mobility, and excellent color purity, suitable for large-area manufacturing and patterning, with optimized light absorption and photoelectric conversion efficiency.
Implementation Method 1
a method for manufacturing perovskite powder using CsX and BX2 precursors, followed by vapor deposition to form a light emitting layer
Implementation Method 2
optimized light absorption and photoelectric conversion efficiency
Data Source
AI summary
A perovskite powder, a light emitting layer for a light emitting device, a perovskite layered structure, an optoelectronic device including the same, and a method for manufacturing the same are provided. The perovskite powder is easy to control the crystal phase ratio in the light emitting layer and is not pyrolyzed during deposition. In addition, the light emitting layer for the light emitting device has an enhanced exciton confinement effect to have excellent light emission efficiency and the like. In addition, the method for manufacturing the light emitting layer for the light emitting device may control the ratio of crystal phases in the light emitting layer and is advantageous for large-area manufacturing. In addition, the perovskite layered structure maintains very high phase uniformity. Further, the optoelectronic device has excellent performance. Furthermore, the method for manufacturing the perovskite layered structure may manufacture a large-area and uniform perovskite thin film.