Photoelectric Conversion Layer With Blue-Light Reflection Tuning
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Solution Overview
Problem
Existing solar cells, including n-p diode type monocrystalline silicon-based and perovskite solar cells, have room for improvement in photoelectric conversion efficiency.
Innovation Solution
A photoelectric conversion element with a reflection layer positioned to maximize reflectance at wavelengths corresponding to the optical absorption coefficient of the photoelectric conversion layer, utilizing particles with specific size and materials to enhance light absorption and charge separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional solar cell structures (n-p diode type monocrystalline silicon or perovskite) are used, then manufacturing and basic functionality are achieved, but photoelectric conversion efficiency is insufficient
Solution Approach 1:
The solar cell structure is segmented into functionally distinct layers: a photoelectric conversion layer containing perovskite compounds for light absorption, and a reflection layer containing metal particles for light reflection. This segmentation allows each layer to be optimized independently for its specific function, improving overall photoelectric conversion efficiency while maintaining manageable structural complexity.
Solution Approach 2:
The invention employs composite materials by combining perovskite compounds in the photoelectric conversion layer with metal particles (silver, aluminum, or zinc) in the reflection layer. This composite structure enables synergistic effects where the perovskite absorbs light and generates charge carriers, while the metal particles reflect unabsorbed light back into the active layer, thereby enhancing photoelectric conversion efficiency.
2Use of energy by moving object
If light absorption is increased to improve photoelectric conversion efficiency, then energy conversion improves, but light reflection losses increase
Solution Approach 1:
The invention converts the harmful effect of light reflection (which normally represents energy loss) into a beneficial effect. The reflection layer containing metal particles redirects reflected light back into the photoelectric conversion layer, giving the light a second chance to be absorbed and converted into electrical energy. This transforms what would be wasted reflected light into additional photoelectric conversion opportunities, thereby reducing energy loss and improving overall 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 proposed configuration increases photoelectric conversion efficiency by optimizing light absorption and charge separation, particularly reflecting blue light effectively and enhancing current density.
Implementation Method 1
A solar cell refers to a cell that absorbs light energy from sunlight and generates current-voltage by the photovoltaic effect, which is a phenomenon generating electrons and holes
Implementation Method 2
a reflection layer disposed between the photoelectric conversion layer and one of the first electrode and the second electrode. The wavelength at which the reflectance of the reflection layer is maximum in the visible region is within the range of wavelengths in which the optical absorption coefficient of the photoelectric conversion layer is 1/5 or more of the maximum optical absorption coefficient in the visible region
Data Source
AI summary
The present disclosure provides a photoelectric conversion element including a first electrode 3, a second electrode 7, a photoelectric conversion layer 5 between the first electrode 3 and the second electrode 7, and a reflection layer 6 between one of the first electrode 3 and the second electrode 7 and the photoelectric conversion layer 5. The wavelength at which the reflectance of the reflection layer 6 is maximum in the visible region is within the range of wavelengths in which the optical absorption coefficient of the photoelectric conversion layer 5 is ⅕ or more of the maximum optical absorption coefficient in the visible region.