研究目的
Investigating the impact of accelerated thermal cycling on the integrity of the semiconductor–metal layer in a commercial monocrystalline Si based photovoltaic solar cell.
研究成果
The Al-Si interface was more susceptible to crack nucleation and propagation compared to the Ag-Si interface. FEM and XFEM simulations highlighted the importance of interfacial adhesion strength and roughness on crack growth. For fabrication of a Si solar cell resistant to thermal stress induced structural damage, processing techniques that produce very strong and smooth Al-Si interface are recommended.
研究不足
The study focuses on the mechanical reliability under cyclic thermal loading but does not address other potential degradation modes such as corrosion or discoloration of the encapsulant. The simulations did not account for nucleation and growth of cracks, focusing instead on plastic deformation.
1：Experimental Design and Method Selection:
Accelerated thermal cycling tests between ?40°C and 90°C were carried out up to 100 cycles on a commercial polymer encapsulated monocrystalline Si solar cell. The samples were observed before and after thermal cycling to understand the effect on microstructure and structural integrity.
2：Sample Selection and Data Sources:
A commercial polymer laminated monocrystalline Si-solar cell was used. Samples were cut into small coupons comprising only a few fingers on the top layer using a low-speed diamond saw.
3：List of Experimental Equipment and Materials:
Environmental chamber with programmable temperature control, scanning electron microscope (SEM), thermocouple for temperature measurement.
4：Experimental Procedures and Operational Workflow:
Samples were thermally cycled between ?40 and 90°C with a ramp-rate of 100°C/h. The actual temperature of the sample was measured by placing a thermocouple in contact with the sample.
5：Data Analysis Methods:
Finite element method (FEM) and extended-FEM (XFEM) simulations were performed to understand the effects of thermal cycling on the stress and strain fields in the solar cell samples.
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