Perovskite Silicon Tandem Solar Cell Texture Planarization
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Solution Overview
Problem
Tandem solar cells with perovskite upper cells and silicon lower cells face challenges in forming uniform light conversion layers due to the difficulty in uniformly forming perovskite layers on micrometer-scale texture structures using conventional solution processes, leading to reduced photoelectric conversion efficiency.
Innovation Solution
A silicon perovskite tandem solar cell design that includes a bonding layer with a first transparent electrode layer on the sidewalls of the texture structure, a buried layer filling concave portions, and a second transparent electrode layer on top, allowing for the formation of a flat plane and enabling uniform deposition of the perovskite upper cell using a solution process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a micrometer-scale texture structure is used on the silicon lower cell to reduce light reflection, then light absorption is improved, but it becomes difficult to uniformly form the perovskite light absorbing layer using a solution process
Solution Approach 1:
A planarization layer is formed in advance on the texture structure before depositing the perovskite layer. This preliminary action creates a flat surface that enables uniform perovskite layer formation while preserving the underlying texture structure for light trapping
Solution Approach 2:
The planarization layer acts as an intermediary between the texture structure and the perovskite layer. It mediates the conflict by providing a flat interface for uniform perovskite deposition while allowing the texture structure to remain intact for optical performance
2Manufacturing precision
If the silicon lower cell has no texture structure to enable uniform perovskite layer formation, then manufacturing precision is improved, but light reflection loss increases
Solution Approach 1:
The texture structure is formed in advance on the silicon lower cell before the perovskite layer is deposited. The planarization layer is then added to create a flat surface, preserving both the light-trapping texture and the uniform perovskite layer
Solution Approach 2:
The solution adds a new dimensional layer (the planarization layer) on top of the texture structure. This creates a multi-layer structure where the texture provides optical benefits in one dimension while the planarization layer provides surface flatness in another dimension
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 reduces light reflection and enhances photoelectric conversion efficiency by ensuring a uniform perovskite upper cell formation on the textured silicon lower cell, improving sunlight absorption and collection.
Implementation Method 1
a bonding layer for bonding the silicon lower cell and the perovskite upper cell between the silicon lower cell and the perovskite upper cell
Implementation Method 2
Photovoltaic power generation is enabled when sunlight is absorbed into a light absorbing layer of a solar cell and electron-hole pairs are generated
Implementation Method 3
sunlight is absorbed into a light absorbing layer of a solar cell and electron-hole pairs are generated
Data Source
AI summary
Disclosed is a tandem solar cell according to an aspect including: a silicon lower cell; a perovskite upper cell disposed on the silicon lower cell; and a bonding layer for bonding the silicon lower cell and the perovskite upper cell between the silicon lower cell and the perovskite upper cell, wherein the front surface portion of the silicon lower cell being in contact with the bonding layer includes a texture structure, the bonding layer includes a first transparent electrode layer formed on the sidewall of the texture structure, a buried layer filling concave portions of the texture structure on the first transparent electrode layer, and a second transparent electrode layer on top surfaces of the buried layer, the first transparent electrode layer and the texture structure.