Nanostructured Inorganic-Organic Heterojunction Solar Cell
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Solution Overview
Problem
Current solar cells face challenges in achieving high efficiency and stability while being cost-effective, with inorganic semiconductor-based cells requiring expensive materials and equipment, and organic cells experiencing efficiency drops due to environmental factors.
Innovation Solution
A full solid-state solar cell with a heterojunction structure combining inorganic and organic materials, using TiO2 as an electron transporter, Sb2S3 as a sensitizer, and P3HT as an organic hole transporter, which absorbs solar light and generates excitons, allowing for efficient energy conversion without volatile electrolytes or expensive dyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inorganic semiconductor-based solar cells are used to achieve high photoelectric conversion efficiency, then conversion efficiency is improved, but manufacturing cost increases due to expensive materials and equipment
Solution Approach 1:
The patent employs a composite structure combining organic sensitizing materials with inorganic semiconductor substrates. The organic dyes or sensitizers are deposited onto the inorganic semiconductor surface, creating a hybrid system that leverages the high light absorption capability of organic materials and the efficient charge transport properties of inorganic semiconductors, thereby achieving high conversion efficiency at lower cost
Solution Approach 2:
The patent modifies the energy level parameters of the organic sensitizing materials to match and optimize the conduction band edge of the inorganic semiconductor substrate. By carefully selecting and tuning the HOMO-LUMO energy levels of organic dyes to align with the semiconductor band structure, the system achieves efficient electron injection and high photoelectric conversion without requiring expensive high-purity inorganic materials
2Ease of manufacture
If organic solar cells are used to reduce manufacturing cost, then manufacturing cost decreases, but efficiency and stability deteriorate due to environmental sensitivity
Solution Approach 1:
The patent creates a composite system where organic sensitizers are combined with inorganic semiconductor substrates. This hybrid structure allows the use of low-cost organic materials while the inorganic substrate provides structural stability and protects the organic components from environmental degradation, thereby maintaining both low cost and high efficiency
Solution Approach 2:
The patent uses inexpensive organic dye molecules as sensitizers that can be easily synthesized and applied. These organic materials, while potentially less stable than inorganic alternatives, are replaced at low cost and provide sufficient operational lifetime for practical applications, achieving a balance between cost and performance
3Productivity
If liquid electrolyte is used in DSSC to achieve high efficiency, then photoelectric conversion efficiency is improved, but stability deteriorates due to volatility and leakage
Solution Approach 1:
The patent transitions from liquid electrolyte to solid-state hole transporting materials, fundamentally changing the physical state parameter of the electrolyte system. This solid-state substitution eliminates volatility and leakage issues while maintaining efficient hole transport through materials with appropriate HOMO energy levels, thereby achieving both stability and efficiency
Solution Approach 2:
The patent replaces the liquid electrolyte system with a solid-state hole transport layer, substituting a fluid-based charge transport mechanism with a solid-material-based mechanism. This substitution eliminates the mechanical issues of liquid electrolytes (volatility, leakage, sealing requirements) while maintaining electrical functionality through solid-state charge carrier transport
4Productivity
If expensive ruthenium-based dyes are used in DSSC to achieve high efficiency, then photoelectric conversion efficiency is improved, but manufacturing cost increases
Solution Approach 1:
The patent substitutes expensive ruthenium-based dyes with inexpensive organic dye molecules that can be synthesized from abundant carbon-based precursors. These organic sensitizers, while simpler in structure, provide comparable light absorption and electron injection performance, dramatically reducing material cost while maintaining high photoelectric conversion efficiency
Solution Approach 2:
The patent modifies the chemical composition parameters of the sensitizer from heavy metal-based (ruthenium) to light-element-based (carbon, hydrogen, oxygen, nitrogen) organic molecules. This compositional change reduces material cost and simplifies synthesis while maintaining the essential photophysical properties needed for efficient solar energy conversion
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 an energy conversion efficiency of 5% or more with artificial sunlight, maintaining stability across varying light intensities and eliminating the need for expensive raw materials or complex sealing processes.
Implementation Method 1
a sensitizer containing an inorganic semiconductor which absorbs solar light to generate photoelectrons and photoholes
Implementation Method 2
an electron transporting layer which transports the photoelectrons to an electrode
Implementation Method 3
a hole transporting layer which forms an interface with the inorganic semiconductor and transports the photoholes to an electrode
Data Source
Figure 1(a)~1(c)
Figure 2
Figure 3
AI summary
Provided is a method for manufacturing a significantly high efficient solar cell having a novel structure and superior stability, and which can be mass-produced from an inexpensive material from an inexpensive material for enabling the easy commercial availability thereof. More particularly, the method of the present invention comprises the following step: (a) depositing slurry containing metal oxide particles and heat-treating the slurry to form a porous electron transporting layer; (b)forming inorganic semiconductors on surfaces of the metal oxide particles for the porous electron-transporting layer; and (c) impregnating the porous electron-transporting layer having the inorganic semiconductor formed thereon with a solution containing an organic photovoltaic material so as to form a hole transporting layer.