Organic Photoelectric Conversion Layer With Crosslinked Chromophore-Fullerene
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Solution Overview
Problem
Existing organic photoelectric conversion elements face challenges in achieving high photoelectric conversion efficiency and response characteristics, particularly in stabilizing the bonding between chromophores and fullerene derivatives during the vacuum vapor deposition process, which affects the energy levels and orientations of these materials within the photoelectric conversion layer.
Innovation Solution
A photoelectric conversion element is designed with a photoelectric conversion layer that includes a chromophore and fullerene or fullerene derivative bonded via a crosslinking group, optimized using a vacuum vapor deposition method to enhance energy levels and electron transfer efficiency, while suppressing trap generation at the interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum vapor deposition method is used to form photoelectric conversion layer, then film formation without solvent impurities is achieved, but bonding stability between chromophore and fullerene derivative is insufficient
Solution Approach 1:
A crosslinking group is introduced as an intermediary between the chromophore and fullerene derivative. This crosslinking group acts as a chemical mediator that forms stable covalent bonds, resolving the insufficient bonding stability issue while maintaining the vacuum vapor deposition film formation process.
Solution Approach 2:
The photoelectric conversion layer is designed as a composite material system comprising chromophore, fullerene derivative, and crosslinking group. This composite structure combines the advantages of vacuum vapor deposition (pure film formation) with enhanced bonding stability through the crosslinking component.
2Strength
If chromophore and fullerene derivative are directly bonded, then bonding strength is improved, but energy levels and orientations cannot be optimized
Solution Approach 1:
The bonding system is segmented into three functional components: chromophore (for light absorption), crosslinking group (for bonding), and fullerene derivative (for electron acceptance). This segmentation allows independent optimization of each component's properties, including energy levels and orientations, while maintaining strong overall bonding.
Solution Approach 2:
Different regions of the photoelectric conversion layer are assigned different functions through the segmented structure. The chromophore region optimizes for light absorption, the crosslinking region optimizes for bonding strength, and the fullerene region optimizes for electron transport, allowing local quality optimization throughout the material.
3Reliability
If crosslinking group is introduced between chromophore and fullerene derivative, then bonding stability and energy level optimization are improved, but device complexity increases
Solution Approach 1:
The crosslinking group is merged with either the chromophore or fullerene derivative to form an integrated photoelectric conversion layer. This merging approach combines multiple functions (bonding, energy level optimization, orientation control) into a single unified structure, reducing overall device complexity despite the added functional capability.
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
This configuration improves the photoelectric conversion characteristics and response speed by stabilizing the bonding between chromophores and fullerene derivatives, leading to higher efficiency and reduced trap formation, thus enhancing the overall performance of the organic photoelectric conversion element.
Implementation Method 1
the vacuum vapor deposition method forms a film by vaporizing or sublimating an organic material that is a vapor deposition material
Implementation Method 2
the vacuum vapor deposition method forms a film by vaporizing or sublimating an organic material that is a vapor deposition material
Implementation Method 3
the chromophore and the fullerene or the fullerene derivative are bonded to each other at least partially via a crosslinking group in the photoelectric conversion layer
Implementation Method 4
photoelectric conversion element using an organic material
Data Source
AI summary
A first photoelectric conversion element according to an embodiment of the present disclosure incudes: a first electrode; a second electrode disposed to be opposed to the first electrode; and a photoelectric conversion layer provided between the first electrode and the second electrode and including a chromophore, fullerene or a fullerene derivative, and a hole-transporting material, in which the chromophore and the fullerene or the fullerene derivative are bonded to each other at least partially via a crosslinking group in the photoelectric conversion layer.