Non-Fullerene Organic Semiconductor Material for High Efficiency Photovoltaics
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Solution Overview
Problem
Current organic photoelectric devices using non-fullerene small molecule organic semiconductor materials have low power conversion efficiency, limiting their performance compared to fullerene-based and polymer-based devices.
Innovation Solution
Development of an organic semiconductor material with a specific structure, comprising various aromatic and heterocyclic rings, and electron-withdrawing groups, which is used in an active layer of an organic photoelectric device to enhance power conversion efficiency, potentially exceeding 14% without the need for additional additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-fullerene small molecule organic semiconductor materials are used in organic photoelectric devices, then the device structure is simplified and manufacturing is easier, but the power conversion efficiency is low (only 7%)
Solution Approach 1:
The patent changes the chemical structure parameters of the small molecule organic semiconductor material by introducing specific electron-withdrawing groups (such as cyano groups, carbonyl groups) and electron-donating groups (such as aromatic rings, heterocyclic rings) to optimize the HOMO-LUMO energy levels and improve light absorption and charge transport properties, thereby achieving power conversion efficiency exceeding 14%
Solution Approach 2:
The patent designs composite small molecule structures combining electron-donating units and electron-withdrawing units in specific configurations (such as D-π-A structures) to create materials with optimized electronic properties that achieve high power conversion efficiency while maintaining the simplicity of small molecule materials
2Productivity
If fullerene derivatives are used in bulk heterojunction structures, then the power conversion efficiency can reach 8%, but the raw material cost is high and the synthesis is difficult
Solution Approach 1:
The patent replaces expensive fullerene derivatives with non-fullerene small molecule materials that are cheaper to produce and easier to synthesize, while achieving comparable or superior power conversion efficiency through optimized molecular structure design
Solution Approach 2:
The patent changes the molecular structure parameters by using non-fullerene electron acceptors with tailored HOMO-LUMO energy levels, improved thermal stability, and enhanced solubility, which simplifies the manufacturing process while maintaining high efficiency
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 new organic semiconductor material significantly improves the power conversion efficiency of organic photoelectric devices, achieving efficiencies over 14% and demonstrating stability and effectiveness in various configurations without the use of additional additives.
Implementation Method 1
the absorption in the visible light region is low, and it is difficult to widen
Implementation Method 2
Organic photoelectric devices can utilize bulk heterojunction (BHJ) structures as devices with basic application characteristics
Data Source
AI summary
Organic photoelectric device comprises a first electrode, a first carrier transfer layer, an active layer, a second carrier transfer layer and a second electrode. The first electrode is a transparent electrode. The active layer includes at least one organic semiconductor material including a structure such as Formula I:The second carrier transfer layer is composed between the active layer and the second electrode. When X1 and X2 are selected from one of Si, Ge and derivatives thereof, the active layer further includes an organic solvent, and the solubility of the organic solvent to the active layer is not less than 5 mg/mL. When X1 and X2 are selected from one of C and its derivatives, the active layer further includes an additive. The power conversion efficiency of the organic photoelectric device of the present invention can be up to more than 14%.