Photoelectric Conversion Device Conductive Groove Structure
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Solution Overview
Problem
The efficiency of perovskite photovoltaic modules is hindered by insufficient conductivity of substrate electrodes, leading to increased connection resistance and reduced charge retrieval as the cell area grows, particularly due to the formation of burrs during scribing, which impairs the flatness and electrical connectivity of the photoelectric conversion device.
Innovation Solution
A photoelectric conversion device structure featuring a conductive layer with a total thickness greater than the counter electrode, overlapping the counter electrode's edge, and a conductive portion within the dividing groove to ensure electrical connection between substrate and counter electrodes, reducing connection resistance and enhancing the module's efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the cell area is increased to improve power output, then the power increases, but the efficiency of retrieving generated electric charge deteriorates due to insufficient substrate electrode conductivity
Solution Approach 1:
The substrate electrode is divided into multiple strip-shaped segments that are electrically connected through conductive portions formed in scribe grooves. This segmentation allows each strip to maintain low resistance while enabling larger overall cell area by connecting multiple substrate electrode strips in parallel through the conductive portions at the scribe grooves.
Solution Approach 2:
Conductive portions are introduced as intermediary elements within the scribe grooves to electrically connect adjacent substrate electrode strips. These conductive portions act as mediators that bridge the gap between substrate electrode strips, ensuring low-resistance electrical connection while maintaining the segmented structure for larger area applications.
2Reliability
If scribing is performed to form grooves for electrical connection, then electrical connectivity is improved, but burrs are formed that impair flatness and electrical connectivity
Solution Approach 1:
The burrs formed during scribing, which are normally harmful defects, are converted into beneficial conductive pathways. The conductive portions are specifically formed within the scribe grooves including the burr regions, transforming the harmful burrs into useful conductive bridges that enhance electrical connection between adjacent substrate electrode strips.
Solution Approach 2:
The physical and chemical parameters of the scribe groove region are modified by forming conductive portions within the grooves. This parameter change transforms the groove from a simple mechanical feature into an optimized electrical connection structure, where the conductive material fills and modifies the groove characteristics to improve conductivity while accommodating the burr geometry.
3Reliability
If a thick conductive layer is added to reduce connection resistance, then electrical conductivity improves, but the device structure becomes more complex
Solution Approach 1:
The conductive portions within the scribe grooves are merged with the counter electrode formation process. The same conductive material that fills the scribe grooves to create electrical connections also serves as part of the counter electrode structure, combining two functions into a single integrated structure and reducing overall device complexity.
Solution Approach 2:
The conductive portions formed in the scribe grooves serve multiple functions: they provide electrical connection between substrate electrode strips, maintain mechanical integrity of the scribed regions, and contribute to the counter electrode structure. This multi-functionality reduces the need for separate components, simplifying the overall device structure while achieving low connection resistance.
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
This configuration lowers the connection resistance between the counter and substrate electrodes, improving the fill factor and endurance of the photovoltaic module by minimizing series resistance and burr-induced bottlenecks, thereby enhancing the overall performance and yield of the device.
Implementation Method 1
a conductive layer 7, which provides electrical connection between the counter electrode 6 and the substrate electrode 4
Data Source
AI summary
A photoelectric conversion device includes: a substrate; a first photoelectric conversion element including a first substrate electrode, a first photoelectric conversion layer, and a first counter electrode; a second photoelectric conversion element including a second substrate electrode, a second photoelectric conversion layer, and a second counter electrode; and a connection including a groove, a conductive portion and a conductive layer, the conductive portion being provided in the groove and including a part of the first counter electrode, and the conductive portion and the conductive layer electrically connecting the first counter electrode and the second substrate electrode. The conductive layer overlaps the first counter electrode on an edge of the groove, and a total thickness of the conductive portion and the conductive layer is larger than a thickness of the first counter electrode.