Perovskite Solar Cell Vertical Orientation and Defect Passivation
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Solution Overview
Problem
Two-dimensional perovskite materials in solar cells exhibit low power conversion efficiency and environmental stability due to horizontal crystal orientations and surface defects, which hinder efficient charge transfer and photostability.
Innovation Solution
A perovskite photoactive composite layer is developed, comprising a two-dimensional perovskite photoactive layer and a passivation layer made of an organic monomolecular compound, which induces vertical crystal orientations and passivates surface defects, enhancing charge transport and photostability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two-dimensional perovskite materials are used in solar cells, then environmental stability is improved, but power conversion efficiency deteriorates due to horizontal crystal orientations and surface defects
Solution Approach 1:
The patent transitions the crystal orientation from horizontal to vertical dimension. The passivation layer induces vertical crystal growth of two-dimensional perovskite, changing the dominant orientation from horizontal (a-b plane) to vertical (c-axis). This dimensional reorientation enables efficient charge extraction while maintaining the environmental stability of 2D perovskite structure.
Solution Approach 2:
The patent creates a composite structure combining two-dimensional perovskite with an organic passivation layer. The passivation layer, consisting of long-chain organic ammonium compounds, forms a composite material system that simultaneously provides defect passivation, crystal orientation control, and charge transport enhancement, resolving the efficiency-stability trade-off.
2Reliability
If two-dimensional perovskite materials are used, then environmental stability is improved, but charge transfer efficiency deteriorates due to surface defects
Solution Approach 1:
The passivation layer acts as an intermediary between the perovskite active layer and the charge transport layer. It mediates the charge transfer process by providing a defect-free interface, passivating surface traps, and facilitating vertical charge extraction. This intermediary layer eliminates the harmful effect of surface defects while preserving the stable 2D perovskite structure.
Solution Approach 2:
The patent applies local quality improvement by specifically targeting the surface region of the perovskite with the passivation layer. The passivation compounds are applied to the top surface where defects occur, providing localized defect passivation and charge extraction pathways without altering the bulk properties of the 2D perovskite, thus maintaining environmental stability while improving charge transfer.
3Productivity
If conventional perovskite structures are used, then charge transfer can occur, but photostability deteriorates due to halogen atom release
Solution Approach 1:
The passivation layer provides beforehand cushioning against photodegradation. By pre-passivating surface defects and forming a protective organic layer before device operation, it prevents halogen atom release and iodine migration that would otherwise occur during光照 exposure. This protective layer acts as a barrier that cushions the perovskite from degradation mechanisms.
4Productivity
If vertical crystal orientation is induced in two-dimensional perovskites, then charge transfer efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs preliminary action by incorporating orientation-directing compounds into the perovskite precursor solution before deposition. These compounds pre-establish the vertical crystal growth template during the solution processing stage, so that when the perovskite forms, it naturally adopts the desired vertical orientation without requiring subsequent complex post-treatment or alignment steps.
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 improves power conversion efficiency and photostability by facilitating vertical charge transport and preventing halogen atom release, maintaining 88% of initial efficiency after 1,000 hours of exposure to light, while also simplifying the introduction of the organic monomolecular compound through a solution process.
Implementation Method 1
a passivation layer which is in physical contact with the perovskite photoactive layer and consists of an organic monomolecular compound
Implementation Method 2
perovskite photoactive layer; power conversion efficiency
Implementation Method 3
The perovskite photoactive layer may be grown by recrystallization in the vertical direction
Data Source
AI summary
A perovskite photoactive composite layer, a preparation method thereof, and a perovskite solar cell comprising the same are provided. The perovskite photoactive composite layer can induce smooth charge transport when applied to a solar cell by means of a two-dimensional perovskite photoactive layer grown by recrystallization in the vertical direction, and can passivate surface defects in two-dimensional perovskites and prevent the release of halogen atoms through effective passivation by means of a passivation layer consisting of an organic monomolecular compound containing zwitterions, thereby improving the photostability of the solar cell.