Selective Light Transmissive Solar Cell for Plant Growth
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Solution Overview
Problem
Conventional dye-sensitized solar cells absorb sunlight across all wavelengths, including those necessary for plant photosynthesis, hindering their use in environments where plant growth is desired.
Innovation Solution
A light selective transmission solar cell with a light filter that selectively transmits wavelengths appropriate for photosynthesis (400-500 nm and 600-700 nm) while using other wavelengths for electricity production, incorporating a refractive portion to control light incidence and improve efficiency, and an angle control mechanism to optimize sunlight utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dye-sensitized solar cells absorb sunlight across all wavelengths to maximize optical absorption, then electricity production efficiency is improved, but plant growth is inhibited due to blocking photosynthesis wavelengths
Solution Approach 1:
The solar cell structure is segmented into multiple functional layers including a light absorption layer with dye, a light filter layer, and a refractive portion. This segmentation allows different wavelength ranges to be directed to different layers - the light absorption layer captures wavelengths for electricity generation while the light filter transmits photosynthesis wavelengths to plants below
Solution Approach 2:
The light filter acts as an intermediary component between the light absorption layer and the plant growth environment. It selectively transmits photosynthesis wavelengths (400-500nm and 600-700nm) while blocking other wavelengths, thereby mediating between electricity production requirements and plant growth needs
2Use of energy by moving object
If conventional solar cells are used to maximize energy absorption, then energy utilization is improved, but the aesthetic appearance and environmental integration are compromised
Solution Approach 1:
The solar cell system performs multiple functions simultaneously: it generates electricity through the light absorption layer, filters and transmits photosynthesis wavelengths through the light filter, and provides aesthetic integration through the refractive portion with prism patterns. This multi-functionality resolves the contradiction between energy utilization and aesthetic appearance
3Ease of manufacture
If the solar cell structure is simplified for ease of manufacture, then manufacturing cost is reduced, but light collection efficiency especially at low solar altitudes deteriorates
Solution Approach 1:
The refractive portion incorporates prism-shaped patterns with specific geometric curvature designed to refract incoming sunlight at optimal angles. This curved geometric design efficiently directs low-angle sunlight into the light absorption layer while maintaining a relatively simple planar structure that is easy to manufacture
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
Enhances sunlight utilization by allowing only necessary wavelengths for plant growth while maximizing electricity production, improving optical efficiency and light collection even at low solar altitudes.
Implementation Method 1
dye-sensitized solar cells have high theoretical efficiency because they produce electricity by electrochemical principles
Implementation Method 2
selectively transmitting only sunlight having a wavelength appropriate for photosynthesis
Implementation Method 3
a refractive portion for refracting light above the upper electrode
Data Source
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AI summary
A light selective transmission solar cell having a light filter includes: an electrode portion consisting of an upper electrode and a lower electrode disposed to face the upper electrode; a light absorption layer disposed between the upper electrode and the lower electrode, and including a dye for transmitting light of a certain wavelength of incident sunlight; and a light filter disposed below the lower electrode, and transmitting light of a certain wavelength of the light transmitted through the light absorption layer and reflecting light of a certain wavelength to the light absorption layer. Accordingly, sunlight in a wavelength region appropriate for photosynthesis is selectively used for plant synthesis, and sunlight in other wavelength regions is used for electricity production.