Perylene Imide Electron Transport Layer for Dye-Sensitized Solar Cells
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Solution Overview
Problem
The existing photoelectric conversion elements exhibit insufficient reactivity between the radical compound as a redox couple and the photosensitizer, leading to inefficient charge separation and transport, resulting in low photovoltaic conversion efficiency.
Innovation Solution
A photoelectric conversion element is designed with an electron transport layer containing a perylene imide derivative, which suppresses charge recombination and improves charge transport characteristics by using a perylene imide derivative with a branched alkyl group substituent, enhancing the interface reactivity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radical compound is used as a redox couple in contact with the electron transport layer, then the response speed to photoirradiation is accelerated and stability is improved, but the reactivity between the radical compound and photosensitizer is insufficient, leading to low photovoltaic conversion efficiency
Solution Approach 1:
The patent changes the chemical structure parameters of the electron transport layer by introducing a perylene imide derivative with specific substituents (Formula 1), which modifies the electronic properties and reactivity of the material to improve both stability and photovoltaic conversion efficiency simultaneously
Solution Approach 2:
The patent creates a composite system by combining the perylene imide derivative electron transport layer with a photosensitizer and radical compound redox couple, where the specific composite structure enables efficient charge separation and transport while maintaining stability
2Speed
If a radical compound is used as a redox couple, then charge transport speed is improved, but charge separation efficiency at the bonded interface is insufficient
Solution Approach 1:
The patent applies local quality by designing the perylene imide derivative with specific local structural features (substituents at different positions) that create optimal local electronic environments at the interface between the electron transport layer and photosensitizer, enhancing both charge separation and transport locally
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 significantly improves the photovoltaic conversion efficiency by reducing charge recombination and enhancing charge transport in the hole transport layer, leading to better light-to-electricity conversion performance.
Implementation Method 1
power generation devices using photovoltaic conversion, such as a photovoltaic cell and a solar cell
Implementation Method 2
the electron transport layer typically supports a dye as a photosensitizer, and such a structure allows the element to be used as a dye-sensitized solar cell. Applying light to the electron transport layer causes the electron transport layer to generate charges
Implementation Method 3
a method of providing a radical compound in contact with the electron transport layer has been developed. In the method, carriers (electrons or holes) generated by photoirradiation to the electron transport layer participate in redox reaction (oxidation-reduction reaction) of the radical compound
Data Source
AI summary
A photoelectric conversion element having high photovoltaic conversion efficiency is provided.The photoelectric conversion element includes a first electrode, a second electrode arranged opposite to the first electrode, and an electron transport layer provided on a face of the first electrode, and the face is opposite to the second electrode. The photoelectric conversion element further includes a photosensitizer supported on the electron transport layer and a hole transport layer interposed between the first electrode and the second electrode. The electron transport layer contains a perylene imide derivative of [Chemical Formula 1].