Halogen-Containing Polymer Hole Transport Layer for Solar Cells
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Solution Overview
Problem
Conventional solar cells, particularly those using PEDOT:PSS as the hole transport layer, face limitations in photoelectric conversion efficiency and durability under high-temperature, high-humidity conditions due to poor film formation and acidic properties, as well as precipitation issues with Spiro and Li-TFSI combinations.
Innovation Solution
A solar cell design incorporating a halogen-containing polymer with an electron-withdrawing group bonded to a hetero atom in the hole transport layer, which enhances photoelectric conversion efficiency and durability by preventing dopant precipitation and improving solubility and compatibility with organic semiconductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PEDOT:PSS is used as the hole transport layer, then the solar cell can be manufactured with conventional materials, but the photoelectric conversion efficiency is insufficient and the film forming properties are poor
Solution Approach 1:
The patent modifies the chemical structure of the hole transport layer material by introducing fluorine atoms and electron-withdrawing groups to create compounds with optimized electronic properties. This parameter change in molecular structure improves both photoelectric conversion efficiency and film forming properties while maintaining compatibility with conventional manufacturing processes
Solution Approach 2:
The patent uses composite materials by combining the fluorinated hole transport layer compound with specific additives and solvents to create an optimized hole transport layer that achieves both high photoelectric conversion efficiency and good film forming properties
2Ease of manufacture
If PEDOT:PSS is used as the hole transport layer, then the manufacturing process is simple, but the material is soluble in water causing poor film forming properties and acidic deterioration
Solution Approach 1:
The patent changes the solubility parameter of the hole transport layer material by fluorination, making it insoluble in water while maintaining processability in organic solvents. This eliminates the film forming problems associated with PEDOT:PSS water solubility
Solution Approach 2:
The patent converts the harmful acidic property of PEDOT:PSS into a beneficial neutral or basic property by using fluorinated compounds, which not only eliminates the deterioration problem but also improves stability under high-temperature and high-humidity conditions
3Productivity
If Spiro and Li-TFSI are used in the hole transport layer, then the photoelectric conversion efficiency is improved, but the high-temperature, high-humidity durability is poor
Solution Approach 1:
The patent changes the thermal and chemical stability parameters of the hole transport layer by using fluorinated compounds with higher glass transition temperatures and lower moisture absorption, thereby achieving both high photoelectric conversion efficiency and excellent high-temperature, high-humidity durability
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 solar cell achieves high photoelectric conversion efficiency and excellent high-temperature, high-humidity durability by using a halogen-containing polymer that facilitates hole transport layer formation and maintains carrier density, outperforming traditional materials in these conditions.
Implementation Method 1
Solar cells generate photocarriers (electron-hole pairs) by photoexcitation so that electrons and holes move through the N-type semiconductor and the P-type semiconductor, respectively, to create an electric field
Data Source
Figure 1
AI summary
The present invention aims to provide a solar cell having high photoelectric conversion efficiency and excellent high-temperature, high-humidity durability. The present invention relates to a solar cell including at least: a photoelectric conversion layer; a hole transport layer; and an anode, the hole transport layer being disposed between the photoelectric conversion layer and the anode, the hole transport layer containing a polymer containing a halogen atom and an organic semiconductor component (1), the polymer containing a halogen atom having a structure that contains a halogen atom and an electron-withdrawing group bonded to a hetero atom. The present invention also relates to a solar cell including at least: a photoelectric conversion layer; a hole transport layer; and an anode, the hole transport layer being disposed between the photoelectric conversion layer and the anode, the hole transport layer containing an organic semiconductor component (2), the organic semiconductor component (2) having a structure that contains a halogen atom and an electron-withdrawing group bonded to a hetero atom.