Solar Cell Electrical Polarization Layer Built-in Field
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Solution Overview
Problem
Existing solar cell technologies face challenges in enhancing photoelectric conversion efficiency while minimizing additional processing costs, particularly in thin film solar cells, as methods like hybrid piezoelectric power generation and field emission layers either require excessive energy or increase processing costs.
Innovation Solution
Incorporating an electrical polarization layer with spontaneous or remnant polarization characteristics between the electrodes and the light-absorbing layer in solar cells, which forms a built-in electric field to reduce electron-hole recombination and improve collection efficiency, thereby enhancing photoelectric conversion efficiency without significant additional processing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an electrical polarization layer is introduced to improve photoelectric conversion efficiency, then photoelectric conversion efficiency is improved, but device complexity increases
Solution Approach 1:
An electrical polarization layer is introduced as an intermediary component between the light-absorbing layer and the electrode. This layer generates a built-in electric field through spontaneous or remnant polarization, which facilitates charge separation and reduces electron-hole recombination, thereby improving photoelectric conversion efficiency without requiring complex external systems
Solution Approach 2:
The electrical polarization layer utilizes spontaneous or remnant polarization characteristics to generate a built-in electric field. By changing the physical state or properties of the polarization layer (such as applying electric field treatment to enhance remnant polarization), the system achieves improved charge collection efficiency without adding complex mechanical or control systems
2Productivity
If hybrid piezoelectric power generation or field emission layers are used to enhance efficiency, then photoelectric conversion efficiency is improved, but processing costs or energy consumption increases
Solution Approach 1:
The electrical polarization layer serves itself by generating the built-in electric field through its inherent spontaneous or remnant polarization characteristics. This self-generated field eliminates the need for external power sources, complex control systems, or additional processing steps, thereby avoiding increased manufacturing costs while still achieving enhanced photoelectric conversion efficiency
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 electrical polarization layer effectively reduces electron-hole recombination and enhances collection efficiency, leading to improved photoelectric conversion efficiency in solar cells, including CIGS thin film solar cells, while minimizing additional processing costs and being applicable to both thin film and crystalline silicon solar cells.
Implementation Method 1
an electrical polarization layer, which forms a built-in electric field due to spontaneous polarization and/or remnant polarization characteristics
Implementation Method 2
an electrical polarization layer, which forms a built-in electric field due to spontaneous polarization and/or remnant polarization characteristics
Implementation Method 3
an electrical polarization layer, which forms a built-in electric field due to spontaneous polarization and/or remnant polarization characteristics
Implementation Method 4
the light-absorbing layer absorbing sunlight is formed of CIGS or CuIn(S,Se)2 (CIS)
Data Source
AI summary
The present invention relates to a structure of a solar cell for improving photoelectric conversion efficiency of the solar cell, and a manufacturing method therefor. One aspect of the solar cell according to the present invention relates to a solar cell having a light-absorbing layer formed between two electrodes arranged to face each other, wherein an electrical polarization layer comprising an electrical polarization material forming an inner electrical field is formed between the electrodes and the light-absorbing layer.