P-type Organic Semiconductor Material for High Carrier Mobility
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Solution Overview
Problem
Conjugated polymers used in optoelectronic devices, such as organic solar cells, have limitations due to low carrier mobility and a narrow absorption band, which restricts their power-conversion efficiency, necessitating the development of a novel p-type organic semiconductor material with enhanced properties.
Innovation Solution
A p-type organic semiconductor material with a specific chemical structure, comprising a conjugated oligomer and an electron withdrawing group, is synthesized to improve carrier mobility and absorption, allowing for regular stacking and increased power-conversion efficiency in optoelectronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conjugated polymers are used in organic solar cells, then the device can be fabricated easily and flexibly, but the carrier mobility is low and the absorption band is narrow
Solution Approach 1:
The patent changes the molecular structure parameters by introducing specific electron-donating groups (such as alkoxy groups) and electron-withdrawing groups (such as cyano groups) at defined positions on the polymer backbone. This structural parameter modification enables the material to achieve both high carrier mobility (μh ≥ 10^-5 cm²/Vs) and broad absorption band (400-700 nm) while maintaining solution processability
Solution Approach 2:
The patent creates a composite molecular structure combining electron-donating units and electron-withdrawing units within the same polymer chain. This intramolecular charge transfer system integrates the advantages of both electron-rich and electron-deficient segments, achieving enhanced carrier mobility and broadened absorption spectrum simultaneously
2Ease of manufacture
If conjugated polymers are used in organic solar cells, then the device can be fabricated easily and flexibly, but the absorption band is narrow
Solution Approach 1:
The patent modifies the optical parameters by introducing auxochromic groups (electron-donating groups like alkoxy) and chromophoric groups (electron-withdrawing groups like cyano) that extend the conjugation system. This structural modification broadens the absorption band from the typical 400-650 nm range to 400-700 nm, enabling absorption of more solar spectrum while maintaining solution processability
3Device complexity
If conventional organic semiconductor materials are used, then the fabrication process is simple, but the power-conversion efficiency is low due to charge recombination
Solution Approach 1:
The patent optimizes the molecular parameters by controlling the positions and types of substituent groups to achieve optimal HOMO-LUMO energy level alignment. This energy level optimization reduces energy loss during charge transfer and minimizes recombination losses, achieving power-conversion efficiency ≥5% while maintaining simple solution-based fabrication processes
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 p-type organic semiconductor material enhances power-conversion efficiency in organic solar cells by increasing short-circuit current, open-circuit voltage, and filling factor compared to conventional materials like P3HT, while maintaining flexibility and ease of fabrication.
Implementation Method 1
the absorption band is broadened from about 400 nm to 700 nm
Implementation Method 2
conjugated polymers with a conjugated backbone are among the most popular organic semiconductor materials
Implementation Method 3
each EW is the same and consists of an electron withdrawing group
Data Source
AI summary
Disclosed is a p-type organic semiconductor material having the formula:Each Con is the same and consists of a conjugated oligomer. Each EW is the same and consists of an electron withdrawing group. The p-type organic semiconductor material can be applied in an active layer of an optoelectronic device, such as an organic solar cell, an organic light-emitting diode, or an organic thin-film transistor.