Tandem Solar Cell Passivation Pattern for High-Temperature Firing
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Solution Overview
Problem
The characteristics of perovskite solar cells are degraded due to exposure to high temperatures during the formation of electrodes in conventional tandem solar cells, leading to reduced electrical connection reliability and inefficient utilization of long wavelength light.
Innovation Solution
A tandem solar cell design that uses a homojunction silicon solar cell with a textured structure and a first passivation pattern to expose part of the emitter layer, protecting it during high-temperature firing and improving electrical connection reliability by directly bonding an inter-layer to the emitter layer, while also reducing reflectance and enhancing long wavelength light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If high-temperature firing is used to form electrodes in conventional tandem solar cells, then electrode formation is achieved, but the perovskite solar cell characteristics are degraded
Solution Approach 1:
The emitter layer is exposed before the high-temperature firing process to create a protected bonding area. This preliminary structural preparation allows the inter-layer to be directly bonded to the emitter layer, shielding it from thermal damage during subsequent electrode formation while maintaining manufacturing feasibility
Solution Approach 2:
The inter-layer serves as an intermediary element that directly bonds to the exposed emitter layer of the silicon solar cell. This intermediary structure enables electrical connection while protecting the perovskite solar cell from direct exposure to high-temperature firing processes
2Loss of energy
If the entire absorption wavelength band is utilized in tandem solar cells, then thermal loss during electron-hole generation is reduced, but the structure complexity increases
Solution Approach 1:
The patent merges the silicon solar cell and perovskite solar cell into a single integrated tandem structure with shared electrodes and inter-layer bonding. This combination enables both cells to work together to capture different portions of the solar spectrum, reducing thermal loss while managing structural complexity through integration rather than separate components
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 solution effectively protects the emitter layer from high-temperature damage, improves electrical connection reliability, and increases the utilization of long wavelength light, thereby enhancing the overall performance of the tandem solar cell.
Implementation Method 1
A perovskite solar cell including a perovskite absorption layer... a silicon solar cell including an emitter layer... the upper portion of the tandem solar cell absorbs light in a short wavelength band and the lower portion absorbs light in a long wavelength band
Data Source
AI summary
The present disclosure relates to a tandem solar cell and a method of manufacturing the same, and more particularly, to a tandem solar cell having a perovskite solar cell stacked on and bonded to a silicon solar cell and a method of manufacturing the same. According to the present disclosure, a tandem solar cell embodied by using a homojunction silicon solar cell is provided with a first passivation pattern so that a part of an emitter layer under the first passivation pattern is exposed, thereby protecting, by the first passivation pattern, the emitter layer during high temperature firing for forming a second electrode, reducing surface defects of the emitter layer, and reducing a problem in that characteristics of the perovskite solar cell are degraded.