Amorphous Nanoparticle Precursor for Low-Temperature Solar Cell Fabrication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for forming compound thin film solar cells require high-temperature thermal processes, which are costly and time-consuming, and use expensive rare elements like indium and gallium, necessitating a more efficient method for fabricating light absorption layers.
Innovation Solution
A method involving the formation of a precursor film using Group IB-IIB-IVA-VIA amorphous nanoparticles on a substrate, followed by a thermal process at reduced temperatures (200° C.-500° C.) to create a light absorption layer, utilizing a chemical bath reaction synthesis and specific elemental ratios, resulting in a kesterite structure solar cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a thermal process is conducted at high temperature to destroy the inherent crystalline structure of alloy or compounds, then a desirable thin film can be formed, but the fabrication cost and time increase
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperature to reduced temperature (200-500°C) by using amorphous nanoparticles as precursors, which do not require high-temperature crystalline structure destruction, thereby reducing fabrication time and cost while maintaining thin film quality
Solution Approach 2:
The patent uses amorphous nanoparticles as disposable precursors that can be applied via low-cost solution processing methods, replacing expensive and time-consuming high-temperature vacuum deposition processes
2Manufacturing precision
If a thermal process is conducted at high temperature to destroy the inherent crystalline structure of alloy or compounds, then a desirable thin film can be formed, but the fabrication cost increases
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperature to reduced temperature (200-500°C) by using amorphous nanoparticles as precursors, enabling the use of simpler, less energy-intensive equipment and processes, thereby reducing fabrication cost while maintaining thin film quality
Solution Approach 2:
The patent replaces complex high-temperature vacuum deposition systems with simple solution processing methods, substituting expensive mechanical/vacuum systems with affordable chemical solution approaches
3Reliability
If conventional methods are used to form compound thin film, then high conversion efficiency can be achieved, but expensive rare elements like indium and gallium are required
Solution Approach 1:
The patent replaces expensive rare elements (indium, gallium) with abundant, inexpensive elements (copper, zinc, tin, sulfur) by using amorphous nanoparticles as precursors, achieving comparable conversion efficiency without relying on scarce materials
Solution Approach 2:
The patent uses composite amorphous nanoparticles containing multiple elements (Cu, Zn, Sn, S) in specific ratios as precursors, which transform into functional light absorption layers with optimized properties, replacing single-element rare materials with multi-element composite structures
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 method reduces fabrication costs and time while achieving a photoelectric conversion efficiency of 0.5-2.5% for CZTS solar cells, demonstrating a cost-effective and efficient approach to forming light absorption layers.
Implementation Method 1
conducting a thermal process to the precursor film to form the light absorption layer on the substrate
Implementation Method 2
a thermal process is conducted at a high temperature to destroy the inherent crystalline structure
Data Source
AI summary
The disclosure discloses a fabrication method for a light absorption layer of a solar cell, including: forming a precursor film on a substrate, wherein the precursor film includes the Group IB-IIB-IVA-VIA amorphous nanoparticles; and conducting a thermal process to the precursor film to form the light absorption layer on the substrate.