Analysis of the causes of light decay of Jinko Solar modules

With the rapid development of the global photovoltaic market, the power generation efficiency and long-term stability of photovoltaic modules have become the core issues of concern to users. However, no matter which brand of photovoltaic modules, "light decay" will inevitably occur during long-term use, that is, the power output of the module gradually decreases during operation. This article will discuss the light decay problem of Jinko Solar modules in detail, analyze its main causes, and provide effective safeguards to ensure long-term stable power generation of photovoltaic power stations.

1. Light decay phenomenon and main causes of Jinko Solar modules

1.1 Definition of light decay

Light decay (LID, Light-Induced Degradation) refers to the phenomenon of the photoelectric conversion efficiency of solar modules decreasing due to material properties and environmental factors after they are put into use. The occurrence of light decay is usually more obvious in the first few months of the use of the module, and then the decay tends to be stable. Different types of photovoltaic modules have different degrees of light decay, and the influencing factors include silicon wafer materials, process flow, packaging technology, and external environmental conditions.

1.2 Types of light decay

LID (light-induced decay): mainly occurs in P-type monocrystalline silicon modules. Due to the presence of boron-oxygen complexes, the module will produce electron recombination when it is initially exposed to sunlight, resulting in power loss.

PID (potential induced degradation): PID degradation usually occurs in high humidity and high temperature environments. The high voltage difference between the glass and the cell of the module causes current leakage, which affects the power output of the module.

LeTID (light-heat induced degradation): It mainly affects PERC (passivated emitter and rear cell) modules. Under high temperature and high humidity conditions, the combined effect of light and temperature causes performance degradation.

Natural aging degradation: Photovoltaic modules are exposed to the outdoors for a long time, and are affected by ultraviolet rays, moisture, wind and sand, etc., and the materials gradually age, resulting in a decrease in photoelectric conversion efficiency.

2. How does Jinko Solar reduce light decay and improve long-term power generation stability?

2.1 Adopting low LID cell technology

Jinko Solar continues to optimize its P-type monocrystalline silicon cell production process, adopts low LID doping technology, reduces the impact of boron-oxygen complexes, and reduces light-induced degradation from the source. For example, some products use gallium-doped technology instead of traditional boron doping, which significantly reduces the LID effect and improves the initial power generation efficiency.

2.2 Reduce PID effect through advanced packaging technology

PID effect is one of the important factors affecting the long-term power generation performance of components. During the component packaging process, Jinko Solar uses anti-PID packaging materials such as high-impedance EVA film and low-sodium glass, and optimizes the matching of cells and packaging materials to reduce current leakage in high voltage environments. In addition, in practical applications, customers are advised to choose PID suppression inverters to further reduce the risk of component attenuation.

2.3 Use N-type TOPCon technology to reduce LeTID attenuation

Traditional PERC cell components are susceptible to LeTID during long-term operation, and the N-type TOPCon (tunneling oxide passivation contact) cell technology launched by Jinko Solar can effectively reduce LeTID attenuation. Compared with PERC, N-type cells have a longer photogenerated carrier lifetime and better anti-attenuation performance under high temperature and high humidity conditions, ensuring that the components maintain higher power generation efficiency over a life cycle of more than 25 years.

2.4 Enhanced weather resistance of components to resist natural aging

Photovoltaic components are exposed to the outdoors for a long time and are affected by natural factors such as temperature changes, wind and sand erosion, moisture and ultraviolet radiation. Jinko Solar has improved the weather resistance of components through the following measures:

Double-glass packaging technology is used to improve the resistance of components to moisture and heat and reduce the aging rate of the packaging layer.

High-transparency and high-weather-resistant EVA film is selected to improve light transmittance and enhance ultraviolet resistance.

High-strength frame and backplane materials are used to improve the mechanical strength of components, reduce the probability of microcracks, and extend service life.

2.5 Reduce the impact of light decay through power station-level optimization measures

In addition to the technical upgrade of the components themselves, the scientific operation and maintenance of the power station can also effectively reduce the impact of light decay and improve the stability of power generation:

Optimize the installation angle and layout: avoid shadows between components, reduce the hot spot effect caused by excessive local temperature, and improve the overall power generation efficiency.

Regular cleaning and maintenance: Pollutants such as dust accumulation and bird droppings will reduce the light transmittance of components. Regular cleaning can effectively improve power generation performance.

Intelligent monitoring system: Use the intelligent monitoring system to monitor the operating status of the components in real time, and take maintenance measures in time when abnormal attenuation is found, such as replacing damaged components or adjusting system parameters.

3. Advantages of Jinko Solar's long-term stable power generation

With advanced manufacturing technology and strict quality control, Jinko Solar has performed well in the anti-attenuation performance of photovoltaic modules. Its modules have the following advantages in long-term operation:

Low attenuation rate commitment: The high-efficiency modules provided by Jinko usually have an attenuation rate of less than 2% in the first year, and the linear attenuation rate in 25 years is controlled within 0.4%/year, which is much better than the industry standard.

More than 25 years of high-efficiency life: The long-term power retention rate of N-type TOPCon modules is higher. In actual applications, the power output can still be maintained at more than 90% after 25 years.

Globally extensive certification: Jinko Solar's products have passed international authoritative certifications such as TÜV and UL, and are suitable for different climatic conditions, ensuring that they can still maintain good power generation performance in harsh environments.

Light decay is an important factor affecting the long-term power generation performance of photovoltaic modules, but through advanced material technology, packaging technology and power station-level optimization measures, the impact of light decay can be effectively reduced and the long-term power generation stability of modules can be improved. Jinko Solar uses multiple measures such as low LID doping technology, anti-PID packaging, N-type TOPCon technology, and high-quality weather-resistant materials to ensure that photovoltaic power stations maintain efficient power generation in long-term operation. Choosing Jinko Solar's high-efficiency and low-attenuation components can not only increase power station revenue, but also reduce operation and maintenance costs, achieve a higher return on investment, and promote the development of green energy.

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