Breakthrough in the research of monocrystalline silicon solar cells where semiconductors are located

The Photovoltaic Energy Group, led by Dr. Han Peide, a researcher at the Institute of Semiconductors, Chinese Academy of Sciences, has made significant progress in solar cell technology. Supported by both national vertical funding and self-raised capital, the group focused on addressing the specific needs of photovoltaic companies. Through years of dedicated research, they successfully integrated several key technologies, including incident light reduction, surface passivation, and selective emitter designs. Leveraging their proprietary partial backside doping technology, the team developed a high-efficiency solar cell with an impressive conversion efficiency of 20.0% on a single-crystal silicon substrate. The performance metrics include a short-circuit current density of 43.9 mA/cm², an open-circuit voltage of 602 mV, and a fill factor of 0.758. This achievement was officially certified by the China Institute of Metrology. As the Chinese photovoltaic movement continues to gain momentum, monocrystalline and polycrystalline silicon solar cells are expected to transition into the third generation of photovoltaic technology, as defined by Martin A. Green. These next-generation cells are anticipated to achieve photoelectric conversion efficiencies of 20% or higher, with power costs below $0.5 per watt and manufacturing costs under $100 per square meter. Given these advancements, the dominance of monocrystalline and polycrystalline silicon in the solar industry is expected to persist for many years. Therefore, increasing the efficiency of single-crystal silicon cells, building independent intellectual property, and guiding PV companies toward sustainable development have become strategically crucial. In response to the evolving demands of the photovoltaic industry, the research group established a guiding principle known as the "Twelve-Word Approach" — focusing on efficiency improvement, re-inspection, cost reduction, and application promotion. This framework serves as a daily guide for the team and ensures that their R&D efforts align closely with the practical needs of the industry. Looking ahead, the group plans to further enhance cell efficiency while conducting pilot tests on existing technologies and actively promoting their integration into production lines. Their long-term goal is to drive innovation, reduce costs, and contribute to the global renewable energy transition.

Sandwich Panel

What are the methods for judging the pros and cons of sandwich panel?
The material of the sandwich panel directly affects the later use. Sandwich panels are the main building materials for Prefabricated House and Steel Structure Warehouse. If you want to choose high-quality panels, you must have an understanding of their basic quality. There are many types of boards on the market, and their core materials, steel plates, adhesives, etc. are different, and the quality will also be affected. So how to judge its pros and cons?

check edge
Because the sandwich panel has several layers, it is difficult to judge its internal quality from the surface. Therefore, it is still necessary to observe its exposed edges first, and it is necessary to pay attention to whether its cross-section is clean and ensure that it is tight. If there are problems such as graying and impurities, then there must be problems in quality, so it is still necessary to do a good job of cross-sectional inspection.

Tap to hear the sound
If it is a relatively good board, you can simply tap it with your fingers. If the sound is a crisp metallic sound, then it is a relatively good board. The fire rating of the Rock Wool Sandwich Panel is Class A, and the fire rating of the polyurethane sandwich panel and Eps Sandwich Panel is B1.


Note the thickness
The thickness of the sandwich panel directly affects the long-term use in the later period. It is necessary to observe the substrate, peritoneum, etc., especially the thickness and quality of the coating, which we cannot ignore. It is necessary to choose a plate with a relatively thick coating and guaranteed quality. Generally, the thickness of the substrate should be about 0.4-0.8MM. If you see the real thing, you should also measure it. The thickness of the finished product is 50mm, 75mm, 100mm, 150mm. The bulk density of the core material is also an important link that affects the quality.

certificate
In fact, as long as it can cooperate with regular manufacturers, the plates sold by the manufacturers need to go through various inspections, and the quality must meet the regulations. Therefore, when purchasing, you can directly check whether it has a certificate of conformity. If you choose a plate from a regular manufacturer, you can not only enjoy a preferential price for direct sales from the manufacturer, but also enjoy good after-sales service.

Now there are many manufacturers supplying plates, and the market quotations and quality of each manufacturer are also different, so it is still necessary to do a good job of quality comparison and price measurement. It is suggested that when purchasing sandwich panels, one must pay attention to its specific quality, and compare the quality of the actual products in order to select high-quality panels.

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Henan Jinming Metal Material Co., Ltd. , https://www.jinminghouse.com