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Jolywood N-type TOPCon module ranks as Top Performer in PVEL 2021 list

Jolywood (Taizhou) Solar Technology Co., Ltd, made it into the list with its high-efficiency, high-power, and high-reliability N-type TOPCon modules,winning the title of "Best Performance" in module reliability issued by PVEL and DNV GL jointly.

As the world’s leading independent laboratory, PVEL tests solar modules from leading solar manufacturers as part of its Product Qualification Program (PQP), and publishes the annual PV Module Reliability Scorecard based on these test results.

In its annual photovoltaic module reliability scorecard project, PVEL has rigorously reviewed the modules produced in the factory in the past 18 months, and conducted the test to determine the performance of the modules. PQP covers multiple test contents such as thermal cycle, damp heat, dynamic mechanical load, PID (Potential Induced Degradation) and PAN file. Currently, in these performance tests, the N-type TOPCon module of Jolywood have been proven excellent, especially the two test results of "PID192/LID+LETID" are very eye-catching and outstanding.

Due to the advantages of raw materials and structure, N-type TOPCon cell has many advantages such as no PID, zero LID (light-induced-degradation), better weak light response, lower risk of cracking, high performance and high reliability, which lead to higher long-term benefits.

In terms of cells, Jollywood has achieved outstanding results in N-type TOPCon technology in recent years. The newly released J-TOPCon 2.0 cell is based on a new generation of tunnel oxide layer and doped polysilicon deposition passivation contact technology. It has the advantages of no LID degradation, low temperature coefficient, high reliability, which provides a strong guarantee for further reducing the cost of electricity.

A study published by Fraunhofer at the EU PVSEC in September 2018 showed that LeTID is prevalent in all commercial components available on the market. LeTID occurs when modules temperatures above 50°C. The mechanisms that cause LeTID include factors such as hydrogen-induced degradation, passivation degradation, and metal impurities. Its LeTID can exceed 10%, which is much higher than LID.

In November 2018, UNSW reported the latest research of LeTID. The research showed that:

1) LeTID degradation mainly occurred in the body area, followed by surface inactivation;

2) With the increase of temperature, the LeTID increases;

3) For phosphorus-doped N-type silicon wafers, the recovery can be observed after LeTID degradation under the condition of light, and the recovery time decreases with the increase of light;

4) For phosphorus-doped N-type silicon wafers, no secondary LeTID was observed after the LeTID was restored under 1~1.5 solar irradiation.

Fraunhofer and NREL researchers have systematically studied and tested the temperature of the modules in different environments, indicating that the temperature of the modules will exceed 75 ° C in desert and hot and humid areas. In high temperature areas like the Middle East, especially attention should be paid to the anti-LeTID performance of modules, N-type bifacial modules are characterized by:

1) N-type silicon, there is no B-O defect composite like in P-type silicon, long lifetime, less affected by LeTID than P-type silicon;

2) N-type bifacial modules can allow part of near-infrared light to pass through, with lower working temperature and lower LeTID;

3) In the case of light, the LeTID will be recovery quickly, the greater the light intensity, the faster the recovery;

4) No secondary LeTID after recovery. Therefore, N-type bifacial modules have excellent Anti-LeTID performance with its natural properties.

Lots of outdoor evidences show that the modules of Jolywood show a very low LID, which is far better than the mainstream bifacial products in the market. LID will play an important role in total return on investment, return on capital and cost per kilowatt hour of photovoltaic project. In the case of the highest LID and the lowest LID, the difference of the total investment rate of return will reach 0.8%, while the difference of the KWH cost will reach 1.8 cent/kWh. If the back gain of the bifacial module and double-glass is considered, the difference will reach about 3%. Therefore, when selecting modules in the market, the LID of modules should be fully considered to reduce the risk of competitive electricity price and improve the competitiveness.

The Niwa series of high-efficiency solar modules promoted by Jolywood have released a total of 3 products. Niwa Pro and Niwa Super are equipped with the world’s first global pioneer J-TOPCon2.0 half cell technology, which can be widely used in large-scale ground power stations, floating power stations, and distributed power stations, BIPV and other projects. The more than 80% bifaciality makes it suitable for various installation and environment, such as vertical installation, oblique installation, and high-efficiency power generation can be also maintained under extreme conditions such as snow, desert and other high temperature, strong wind and sand. Niwa Black, mainly used in BIPV, adopts an all-black aesthetic design, which provides high-efficiency power generation and meanwhile highlights the exquisite appearance, and brings the ultimate home photovoltaic experience to customers. Niwa series products are truly noble but not expensive, and have the best of both worlds.

In 2021, the demand for PV will only increase. Exwatt forecast that the new module capacity will reach 100GW by the end of 2021. As the price of photovoltaic raw materials rises, module suppliers are faced with a tough choice between cost and quality. With the development of large size and half photovoltaic cell design, modules are faced with greater probability of crack, and the market has put forward higher requirements for the reliability of modules.

Lower Micro-crack Risk

The crack of modules is a difficult problem in photovoltaic power stations. The crack is an invisible defect produced inside solar cells, which the naked eye cannot be judged, so it needs the help of professional testing equipment. However, crack will seriously affect the lifetime of power station and actual power generation, so crack is a major potential trouble in the construction of photovoltaic power station.

N-type monocrystalline bifacial solar cells have a symmetrical structure and less internal stress. Silver paste is printed on both sides of the N-type cells to improve the stability. N-type bifacial cells have higher reliability, especially in the frequent sandstorm weather like the Middle East, and the modules have to withstand the test for decades. It can be said that reliability is a very important assessment index for modules, and N-type bifacial cells have unique advantages in this respect.

In this increasingly prosperous photovoltaic market, photovoltaic products are competing for leadership. With its excellent product quality management and control ability, product testing and R&D strength, Jolywood stand out with its high efficiency and reliability N-type TOPCon solar products and establish the leading position of photovoltaic technology.