Thiazole Polymer Photovoltaic Cell Light Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The efficiency of photovoltaic cells is limited by the ability of their electrodes to transmit light, as conventional semiconductive materials used for electrodes can hinder light transmission, affecting the overall energy conversion efficiency.
Innovation Solution
The development of polymers containing thiazole moieties, such as cyclopentadithiazole, thiazolothiazole, and thiazole units, which are used as charge carriers in the active layer of photovoltaic cells, allowing for improved light absorption and increased efficiency by shifting the maximum absorption wavelength towards the red or near IR region, and enhancing solubility and semiconductive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If semiconductive material (e.g., indium tin oxide) is used to form the electrode through which light passes, then light transmission is improved, but electrical conductivity is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the photoactive material by incorporating thiazole-containing polymers with specific molecular structures (bithiazole, cyclopentadithiazole, thiazolothiazole moieties). These parameter changes enable the material to simultaneously achieve high light transmission in the visible spectrum and adequate electrical conductivity for charge transport, resolving the contradiction between optical and electrical properties.
Solution Approach 2:
The patent employs composite photoactive materials that combine thiazole-containing polymer chains with conjugated systems. This composite structure integrates both optical absorption capabilities and charge transport pathways within a single material system, allowing simultaneous optimization of light transmission and electrical conductivity without requiring separate electrode and photoactive layers.
2Productivity
If conventional photoactive materials are used, then device structure is simple, but light absorption efficiency is limited
Solution Approach 1:
The patent systematically varies molecular parameters of the thiazole-containing polymers, including substituent groups (alkyl, alkoxy, aryl, heteroaryl), ring structures (bithiazole, cyclopentadithiazole, thiazolothiazole), and chain length. These parameter changes enable tuning of the HOMO-LUMO energy gap to match the solar spectrum, maximizing light absorption efficiency while maintaining processable molecular weights and solubility characteristics.
Solution Approach 2:
The patent introduces specific functional groups at localized positions within the polymer chain (electron-donating groups at terminal positions, electron-withdrawing groups at core positions) to create local electronic property variations. This local quality approach enables optimization of charge separation and transport at specific sites while maintaining overall molecular simplicity and processability.
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
These polymers increase the current and efficiency of photovoltaic cells by absorbing light at longer wavelengths, providing improved solubility and semiconductive properties, leading to high cell voltage and efficient charge transfer, with charge mobility ranging from 10−4 to 10−1 cm2/Vs, and are suitable for use in organic field effect transistors and OLEDs.
Implementation Method 1
absorbing light at longer wavelengths, providing improved solubility and semiconductive properties
Implementation Method 2
Photovoltaic cells are commonly used to transfer energy in the form of light into energy in the form of electricity
Data Source
AI summary
Photovoltaic cells with thiazole-containing polymers, as well as related components, systems, and methods, are disclosed.