Perovskite Solar Cell Interface Film for High-Illuminance Stability
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Solution Overview
Problem
Photoelectric conversion elements experience a decrease in power generation efficiency when exposed to high illuminance over a long period.
Innovation Solution
Incorporating a film composed of a compound represented by General Formula (2) between the photoelectric conversion layer and the hole-transporting layer, which includes cationic amino, pyridinium, imidazolinium, or pyrrolidinium compounds, enhances the element's ability to maintain efficiency under high illuminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If photoelectric conversion elements are used for prolonged exposure to high illuminance, then power generation output is initially high, but power generation efficiency decreases over time
Solution Approach 1:
The patent introduces a film containing a specific compound as an intermediary layer between the photoelectric conversion layer and the hole-transporting layer. This intermediary film prevents direct harmful interactions while allowing beneficial charge transport, thereby maintaining efficiency stability under high illuminance conditions.
Solution Approach 2:
The patent modifies the chemical composition and structure of the interface between layers by introducing a film with a compound having specific molecular characteristics (General Formula (2)). This parameter change in the interfacial properties prevents efficiency degradation while maintaining high power generation output.
2Reliability
If a film including a compound represented by General Formula (2) is disposed between the photoelectric conversion layer and the hole-transporting layer, then power generation efficiency is maintained under high illuminance, but device structure becomes more complex
Solution Approach 1:
The patent applies the compound of General Formula (2) specifically at the critical interface between the photoelectric conversion layer and hole-transporting layer, rather than throughout the entire device. This localized application maintains efficiency stability without requiring complex modifications to the overall device structure.
Solution Approach 2:
The patent creates a composite structure by combining the film containing the compound of General Formula (2) with existing photoelectric conversion and hole-transporting layers. This composite approach enhances reliability while building upon established device architectures rather than requiring entirely new complex structures.
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 photoelectric conversion element maintains power generation efficiency even after prolonged exposure to high light intensity.
Implementation Method 1
a photoelectric conversion element includes a first electrode, a photoelectric conversion layer, a hole-transporting layer, a second electrode, and a film including a compound represented by General Formula (2)... The photoelectric conversion layer has a perovskite structure
Data Source
AI summary
A photoelectric conversion element includes a first electrode, a photoelectric conversion layer, where the photoelectric conversion layer has a perovskite structure, a hole-transporting layer, a second electrode, and a film including a compound represented by General Formula (2) disposed between the photoelectric conversion layer and the hole-transporting layer. In General Formula (2), A is a cationic amino compound represented by General Formula (6) or General Formula (7), a cationic pyridinium compound, a cationic imidazolinium compound, or a cationic pyrrolidinium compound. In General Formula (6), R1 is —H, —F, —CF3, or —OCH3, n is 1 or 2, and X is Br or I. In General Formula (7), n is an integer of 5 or greater but 12 or less, and X is Br or I.