Perovskite Optoelectronic Layer Stack With PEIE Barrier Interface
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Solution Overview
Problem
Existing optoelectronic devices, particularly perovskite-containing solar cells, face challenges in achieving long-term stability due to issues such as degradation from exposure to solvents and atmospheric moisture, as well as diffusion of species like halogens and metals between layers, which affect the quality and performance of the underlying layers.
Innovation Solution
Incorporating an intervening layer with specific functional groups, such as poly(ethylenimine) ethoxylated (PEIE), between layers in the device structure to enhance bonding and act as a barrier, using methods like vapor phase deposition to improve layer conformity and stability, thereby isolating perovskite layers from processing solvents and environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an intervening layer is added between layers to improve bonding and stability, then device reliability and layer adhesion are improved, but device structure complexity increases
Solution Approach 1:
The patent introduces an intervening layer comprising poly(ethylenimine) ethoxylated (PEIE) as a mediator between the perovskite layer and the electron transport layer. This intermediate layer improves interfacial bonding and stability by providing compatible surface chemistry and morphology, preventing direct detrimental interactions between adjacent layers while maintaining device performance.
Solution Approach 2:
The device structure is segmented into distinct functional layers with the PEIE intervening layer separating the perovskite active layer from the electron transport layer. This segmentation allows each layer to be optimized independently for its specific function while the intervening layer manages the interface between them, reducing mutual degradation effects.
2Manufacturing precision
If vapor phase deposition is used to deposit the intervening layer, then layer conformity and coverage are improved, but manufacturing process complexity increases
Solution Approach 1:
The patent replaces conventional solution-based deposition methods with vapor phase deposition for depositing the PEIE intervening layer. This substitution provides superior layer conformity and uniform coverage across the substrate surface, as vapor phase deposition enables molecular-level control of film formation without the limitations of liquid carrier systems.
Solution Approach 2:
The deposition process parameters are optimized to achieve the desired layer properties, controlling temperature, pressure, and deposition rate to ensure uniform PEIE layer formation. By adjusting these parameters, the process achieves high conformity while managing the complexity through systematic parameter optimization.
3Reliability
If the third layer thickness is reduced to between greater than zero nm and about 100 nm, then device performance is improved through better interface contact, but layer quality control becomes more difficult
Solution Approach 1:
The patent optimizes the thickness of the PEIE intervening layer to be between greater than zero nanometers and about 100 nanometers. This parameter optimization ensures sufficient thickness for providing adequate interface contact and stabilizing the perovskite layer, while remaining thin enough to maintain good electrical contact and prevent excessive series resistance. The specific thickness range balances interface quality with manufacturability.
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 intervening layer improves the bonding and stability of the device, reducing degradation and enhancing the performance and longevity of perovskite-containing solar cells by providing a physical barrier to environmental factors and solvent exposure.
Implementation Method 1
the second layer may include a functional group that includes at least one of a hydroxyl group and/or an amine... the second layer improves the bonding of the third layer to the second layer
Implementation Method 2
using methods like vapor phase deposition to improve layer conformity and stability
Data Source
AI summary
The present disclosure relates to a device that includes a first layer that includes at least one of a semiconducting material, a hole transport material (HTM), and/or an electron transport material (ETM), a second layer, and a third layer that includes a material that is at least one of transparent or conductive, where the second layer is positioned between the first layer and the third layer, the first layer, the second layer, and the third layer are in electrical contact with each other, and the third layer has a first thickness between greater than zero nm and about 100 nm. In some embodiments of the present disclosure, the semiconducting material may include a perovskite.