Photoactive Layer Donor-Acceptor Ratio for Organic Solar Cells
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Solution Overview
Problem
Organic solar cells face efficiency limitations due to charge loss from electron and hole recombination, requiring additional processing steps that increase manufacturing costs.
Innovation Solution
A photoactive layer comprising a higher content of single molecular material than polymer material, with a weight ratio of electron donor to electron acceptor between 10:1 and 1.1:1, enhancing efficiency and stability by using a combination of single molecular and polymer materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If additional processing steps are used to deliver charges to electrode without loss, then charge loss due to recombination is reduced, but manufacturing costs increase
Solution Approach 1:
The patent combines electron donor and electron acceptor materials within the photoactive layer to create internal charge transport pathways. This merging of functions within a single layer eliminates the need for additional separate processing steps while reducing charge recombination losses through optimized material interaction and charge separation.
Solution Approach 2:
The patent uses composite materials consisting of both electron donor and electron acceptor components in the photoactive layer. This composite structure enables efficient charge generation and transport within the same layer, reducing charge loss without requiring additional processing steps or complex device architecture.
2Loss of energy
If inorganic solar cell materials are used, then power conversion efficiency reaches approximately 24%, but economic feasibility and material supply limitations arise
Solution Approach 1:
The patent changes the material parameters from inorganic to organic compounds in the photoactive layer, maintaining acceptable power conversion efficiency while dramatically improving ease of manufacture. The organic materials can be processed using solution-based methods at lower temperatures, reducing manufacturing costs and improving economic feasibility compared to high-temperature inorganic semiconductor processing.
Solution Approach 2:
The patent employs organic materials that are generally less expensive and more abundant than inorganic semiconductor materials. These organic compounds can be synthesized through established chemical processes and processed using low-cost solution methods, making the solar cell more economically viable despite potentially shorter material stability lifetimes.
3Ease of manufacture
If single molecular material is used as electron donor, then reproducibility and simple processing are achieved, but efficiency may be limited
Solution Approach 1:
The patent creates a composite electron donor system combining single molecular materials with polymer materials in the photoactive layer. This composite approach leverages the reproducibility and ease of processing of single molecular materials while incorporating polymer materials that enhance efficiency through improved charge transport and reduced recombination, thus resolving the contradiction between manufacturability and performance.
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 solution increases the efficiency and stability of organic solar cells by optimizing the content ratio of single molecular and polymer materials in the photoactive layer, improving charge transport and reducing recombination losses.
Implementation Method 1
An organic solar cell is a device which may directly convert solar energy into electric energy by applying a photovoltaic effect
Data Source
AI summary
The present specification provides a photoactive layer including: an electron donor; and an electron acceptor, in which the electron donor includes: a single molecular material; and a polymer material, a content of the electron donor is higher than a content of the electron acceptor, and in the electron donor, a content of the single molecular material is higher than a content of the polymer material, and an organic solar cell including the same.