Organic Semiconductor Polymer for Solar Cells
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Solution Overview
Problem
Current organic thin film solar cells have insufficient photoelectric conversion efficiency and durability, particularly in the presence of oxygen, with issues of film thickness unevenness and pinholes, which affect uniform battery performance.
Innovation Solution
An organic semiconductor polymer with a thieno[3,4-d]thiazole structure and electron-withdrawing substituents is developed, featuring a deep HOMO energy level and high polarity to enhance absorption of longer wavelengths and improve wettability, reducing pinholes and unevenness in the photoelectric conversion layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic semiconductor polymers with high solubility and carrier mobility are used to increase short circuit current, then photoelectric conversion efficiency is improved, but durability particularly in the presence of oxygen deteriorates
Solution Approach 1:
The patent modifies the chemical structure of thieno[3,4-d]thiazole units by introducing specific substituents (cyano group, carboxyl group, ester group, or amide group) at the 2-position, which changes the electronic and physical parameters of the polymer to achieve both high photoelectric conversion efficiency and improved oxygen stability
Solution Approach 2:
The patent creates composite polymer structures by combining thieno[3,4-d]thiazole units with various functional groups (cyano, carboxyl, ester, amide) to achieve synergistic effects that simultaneously improve photoelectric conversion efficiency and durability against oxygen degradation
2Productivity
If band gap narrowing is conducted to enhance photoelectric conversion efficiency, then absorption of longer wavelengths is improved, but durability may be compromised
Solution Approach 1:
The patent achieves band gap narrowing by incorporating electron-withdrawing groups (cyano, carboxyl, ester, amide) at the 2-position of thieno[3,4-d]thiazole, which modifies the HOMO-LUMO energy gap to enable absorption of longer wavelengths while maintaining structural stability and durability
3Ease of manufacture
If coating process is used to produce large-sized solar cells, then production convenience is improved, but film thickness unevenness and pinholes occur affecting uniform battery performance
Solution Approach 1:
The patent introduces polar groups (carboxyl, ester, amide) that enhance the polarity of the polymer, improving wettability with the hole transport layer and enabling more uniform film formation during coating processes, thereby reducing thickness unevenness and pinholes
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 polymer achieves a balance between photoelectric conversion efficiency and durability, ensuring uniform performance across different sites and reducing film thickness unevenness and pinholes, thereby enhancing the overall efficiency and stability of organic solar cells.
Implementation Method 1
organic photoelectric conversion elements that generate power when irradiated with light
Implementation Method 2
have a highly polar thieno[3,4-d]thiazole skeletal structure and to have an electron-withdrawing polar group at the 2-position, the polarity of the polymer increases, and wettability of the polymer to a highly polar hole transport layer
Data Source
AI summary
An organic semiconductor polymer comprising a structural unit represented by the following Formula (I), a composition for organic semiconductor material, a photovoltaic cell and a polymer.wherein Z1 and Z2 each independently represent S, O, Se or Te; R represents —SOpX, —CN, —NO2, —P(═O)(OR1,)(OR2) or —C(R1′)═C(CN)2; X represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, an aromatic heterocyclic group or —NR3(R4); R1, R2, R1,, R3 and R4 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or an aromatic heterocyclic group; R3 and R4 may bond with each other to form a ring; and p represents 1 or 2.