Since the performance or output power stability of amorphous silicon solar cells is often affected by various factors in practical applications, Therefore, photovoltaic cell manufacturers often work hard to find various ways to improve the performance stability of amorphous silicon solar cells and after upgrading, various high-quality testing equipment are used to test the performance of solar cells. Built-in Four-Point Probe Tester produced by Millennial Solar can quickly and accurately measure the sheet resistance/resistivity of amorphous silicon solar cells in large-scale industrial deposition processes and ensure the integrity of the photovoltaic cells after the measurement is completed.

Stability of amorphous silicon solar cell performance

The stability of amorphous silicon solar cells refers to the degree to which the conversion efficiency changes over time, and is generally measured by the decay rate. The stability of amorphous silicon solar cells is affected by many factors, such as material quality, structural design, preparation process control, environmental conditions, etc. Improving the stability of amorphous silicon solar cells is an important way to improve their performance and reduce their costs.

Methods to improve performance stability of amorphous silicon solar cells

Because the performance of amorphous silicon solar cells will decline with time and light during actual use, this will affect their long-term reliability. Therefore, improving the performance stability of amorphous silicon solar cells has become a very important link in the production process of solar cells.

Stacked or heterostructure design

Since amorphous silicon itself is a direct bandgap semiconductor with a high light absorption coefficient, the photosensitive layer of amorphous silicon solar cells can be made very thin, which can reduce the recombination loss of carriers during transmission and improve efficiency. However, single-layer amorphous silicon solar cells also have some problems, such as poor spectral matching, insufficient built-in electric field, and serious interface recombination.

In order to solve these problems, stacked or heterostructure designs can be adopted, that is, based on single-layer amorphous silicon solar cells, other materials or structures are added as photosensitive layers or buffer layers to achieve better utilization of the solar spectrum. Enhance the built-in electric field and reduce interface recombination.

Optimize electrode and interface material selection

The selection of electrodes and interface materials for amorphous silicon solar cells also affects their performance stability. On the one hand, electrode materials are required to have good conductivity and light transmittance to ensure effective collection of carriers and transmit incident light as much as possible. On the other hand, electrode materials are required to have good stability and compatibility to avoid chemical reactions or physical damage with the amorphous silicon film, resulting in interface degradation or delamination. Therefore, optimizing and selecting electrodes and interface materials of amorphous silicon solar cells to achieve efficient, stable and low-cost amorphous silicon solar cells is an important method to improve the performance stability of amorphous silicon solar cells.

Surface passivation and encapsulation technology

The surface and interface of amorphous silicon solar cells are key parts that affect its performance stability, because defective states, impurities, oxides, etc. are easily generated here, resulting in increased carrier recombination and reduced efficiency. In order to reduce the impact of these adverse factors, surface passivation and encapsulation technologies can be used to improve the stability of amorphous silicon solar cells. Surface passivation technology is to add one or more passivation layers to the surface or interface of amorphous silicon films to suppress carrier recombination and impurity diffusion. The material selection of the passivation layer requires good light transmittance, conductivity, stability and compatibility.

Encapsulation technology is to add one or more protective layers to the outside of amorphous silicon solar cells to prevent moisture, oxygen, dust and other environmental factors from damaging the cells. The material selection of the encapsulation layer requires good light transmittance, waterproofness, oxygen resistance, weather resistance, etc.

Optimizing the preparation process of amorphous silicon thin films

The preparation process of amorphous silicon thin films has an important impact on the stability of photovoltaic cell performance. Different process parameters will lead to different defect state density, hydrogen content, microcrystalline phase content and other factors, which in turn affect the stability of photovoltaic cells. Generally speaking, increasing the deposition rate, deposition temperature, hydrogen flow rate, etc. can reduce the defect state density, and increasing the hydrogen dilution ratio can increase the microcrystalline phase content, thereby improving the stability of photovoltaic cells.

Use the Built-in Four-Point Probe Tester produced by Millennial Solar to perform quality inspection on amorphous silicon films. The Built-in Four-Point Probe Tester can rely on its unique inspection technology to perfectly connect with the automated production process of the solar cell production line, providing good electrical contact while ensuring zero fragmentation rate, truly realizing non-destructive testing!

Built-in Four-Point Probe Tester

E-mail: market@millennialsolar.cn

FPP230 Auto is a Built-in Four-Point Probe Tester specially designed for photovoltaic process monitoring. It can quickly and automatically scan the sample to obtain the sheet resistance distribution information at different positions of the sample. The measurement size can be customized according to the size of the customer's sample.

●Measurement range meets sheet resistance of 1μΩ~100MΩ

●Able to match automation equipment and traceable at any time

●Perfectly matched with the automated production process of the production line

●Provide good electrical contact while ensuring zero debris

●The number of measurement points can be customized according to customer needs

The value of a commodity is often expressed indirectly through its own objective attributes. The value of amorphous silicon solar cells lies in its stable performance and continuous power output when put into practical applications. Built-in Four-Point Probe Tester produced by Millennial Solar can scientifically and effectively measure the sheet resistance/resistivity of amorphous silicon solar cells in large-scale industrial production processes, and can be perfectly connected with the production process.

This enables amorphous silicon solar cells to have extremely reliable scientific support for practical applications, thus helping photovoltaic cell manufacturers to carry out efficient production and scientific applications!