Perovskite Solar Cell Interface Voids for Higher Open-Circuit Voltage
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Solution Overview
Problem
Perovskite solar cells manufactured using existing methods suffer from insufficient open-circuit voltage and require improvement.
Innovation Solution
A manufacturing method that forms physical vacancies at the interface of the hole transport layer and photoelectric conversion layer by applying a hydrophilic treatment, moisture absorption, and heating to create voids, allowing holes to bypass and reduce nonradiative recombination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a perovskite solar cell is manufactured using conventional methods without physical vacancies at the interface, then the manufacturing process is simple and stable, but the open-circuit voltage is insufficient and power generation performance needs improvement
Solution Approach 1:
The hydrophilic treatment is performed on the hole transport layer surface before applying the perovskite precursor, and moisture is absorbed in advance. This preliminary preparation creates the conditions necessary for forming physical vacancies during subsequent heating, thereby improving open-circuit voltage before the actual photoelectric conversion layer formation occurs
Solution Approach 2:
The manufacturing process changes physical parameters by controlling moisture absorption and heating conditions. By adjusting the hydrophilic treatment intensity and moisture absorption duration, the amount and distribution of physical vacancies at the interface are controlled, which directly affects the open-circuit voltage while managing process complexity
2Reliability
If physical vacancies are formed at the interface of the photoelectric conversion layer and hole transport layer, then nonradiative recombination is suppressed and open-circuit voltage improves, but the manufacturing process becomes more complex
Solution Approach 1:
Moisture acts as an intermediary substance that facilitates vacancy formation. The hydrophilic treatment introduces moisture absorption capability into the hole transport layer, and during heating, this absorbed moisture evaporates to create physical vacancies. This intermediary mechanism achieves reliable power generation performance through a relatively simple wet chemical process rather than complex physical vapor deposition or etching methods
3Loss of energy
If the surface of the hole transport layer undergoes hydrophilic treatment and absorbs moisture, then physical vacancies are formed at the interface during heating, but additional process steps are required
Solution Approach 1:
The hydrophilic treatment and moisture absorption steps are merged into a single preparatory phase before precursor application. The hydrophilic treatment not only modifies surface properties but also enables simultaneous moisture absorption, combining multiple functions into integrated process steps that improve energy conversion efficiency while maintaining reasonable manufacturing 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 method enhances the open-circuit voltage of the solar cell module by suppressing nonradiative recombination and improving power generation performance.
Implementation Method 1
performing a hydrophilic treatment on a surface of the hole transport layer formed on the substrate prepared
Implementation Method 2
causing the surface of the hole transport layer on which the hydrophilic treatment is performed to absorb moisture
Implementation Method 3
heating the precursor applied so as to form the photoelectric conversion layer from the precursor and vaporizing the moisture absorbed in the surface of the hole transport layer
Data Source
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AI summary
A manufacturing method for a solar cell module having stacked hole transport (11), photoelectric conversion (12), and electron transport layers (13) includes: preparing a substrate with the hole transport layer formed therein; performing hydrophilic treatment on the hole transport layer surface on a first substrate; causing the hole transport layer surface to absorb moisture; applying a precursor for the photoelectric conversion layer to the hole transport layer surface with moisture absorbed therein; heating the precursor to form the photoelectric conversion layer from the precursor and vaporizing moisture absorbed in the hole transport layer surface, thereby forming vacancies (21) at an interface of the photoelectric conversion layer contacting the hole transport layer; and forming the electron transport layer on the photoelectric conversion layer surface.