Flexible Perovskite Solar Cells With Ammonium Acetate Passivation
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Solution Overview
Problem
The record efficiency of flexible perovskite solar cells (PSCs) lags behind their rigid counterparts, hindering their application in self-powered devices. Additionally, there is a lack of understanding in the design principle of passivation molecules to enhance the efficiency and stability of flexible PSCs beyond 23%.
Innovation Solution
The use of ammonium acetates, specifically pentylammonium acetate (PenAAc), phenylethylammonium acetate (PEAAc), 2-([1,1′-biphenyl]-4-yl) ethan-1-amine acetate (BEAAc), and others, as an interface modification layer in contact with the perovskite layer to passivate defects and enhance the performance of flexible PSCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional defect passivation materials are used in flexible perovskite solar cells, then device stability is improved, but power conversion efficiency remains below 23%
Solution Approach 1:
The patent introduces an interface modification layer comprising ammonium acetate molecules as an intermediary between the perovskite layer and charge transporting materials. This intermediary layer specifically targets and passivates defects at the grain boundaries and interfaces, where conventional materials failed to achieve both high efficiency and stability. The ammonium acetate molecules act as a mediator that simultaneously improves device stability and enables power conversion efficiency exceeding 23% by reducing non-radiative recombination at critical defect sites.
Solution Approach 2:
The patent employs parameter changes by systematically varying the chemical structure of ammonium acetate molecules (different alkyl chain lengths and aromatic substitutions) to optimize defect passivation performance. By modifying molecular parameters such as hydrophobicity, steric bulk, and electronic properties, the invention achieves enhanced simultaneous improvement in both device stability and power conversion efficiency, breaking through the 23% efficiency barrier while maintaining mechanical stability under bending conditions.
2Adaptability or versatility
If flexible perovskite solar cells are designed for mechanical flexibility, then adaptability to wearable applications is improved, but device efficiency lags behind rigid counterparts
Solution Approach 1:
The ammonium acetate interface modification layer serves as a protective intermediary that decouples the mechanical flexibility requirement from the optoelectronic performance. This intermediary layer at the perovskite interface provides defect passivation that maintains high power conversion efficiency (>23%) even when the device is subjected to bending and mechanical deformation, enabling flexible devices to achieve efficiency levels previously only seen in rigid structures.
Solution Approach 2:
The patent utilizes thin film structures with low-temperature processed charge transporting materials that inherently provide mechanical flexibility. Combined with the interface modification layer, this flexible thin-film architecture maintains both the adaptability for wearable applications and high device efficiency, as the interface passivation compensates for any performance degradation that might occur under mechanical stress.
3Stability of the object's composition
If grain boundary defect passivation is enhanced to improve stability under strain, then mechanical stability is improved, but understanding of passivation molecule design principles remains insufficient
Solution Approach 1:
The patent systematically varies molecular parameters of ammonium acetate compounds (alkyl chain length, aromatic substituents, hydrophobicity) to establish structure-performance relationships for grain boundary passivation. By changing these molecular parameters and observing their effect on device stability under strain and power conversion efficiency, the invention provides actionable design principles for selecting passivation molecules that simultaneously enhance mechanical stability and maintain high efficiency, moving beyond trial-and-error approaches.
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 incorporation of these ammonium acetates leads to a significant enhancement in the power conversion efficiency (PCE) of flexible PSCs, achieving a record PCE of 23.68% with improved stability and mechanical bending resistance, maintaining over 91% of the original efficiency after 5,000 bending cycles.
Implementation Method 1
the passivation of defects in grain boundaries becomes increasingly important in flexible PSCs
Data Source
AI summary
An ammonium acetate selected from the group of pentylammonium acetate, phenylethylammonium acetate, 2-([1,1′-biphenyl]-4-yl) ethan-1-amine acetate, butanammonium acetate, hexylammonium acetate, octylammonium acetate, phenylbutanammonium acetate, and any combination thereof, is used to modify a perovskite layer in a perovskite solar cell. A perovskite solar cell includes a perovskite layer and an interface modification layer that is in contact with the perovskite layer and includes at least one ammonium acetate provided herein. A method of preparing the inverted perovskite solar cell.