New laser pointer manufacturing process revolutionizes the photovoltaic market

The Solar Energy System Research Institute in Freiburg, Germany has developed a laser pointer-based manufacturing process method that is revolutionizing the photovoltaic market. Mass production of point-contact solar cells was realized for the first time. Millions of batteries with high efficiency levels have entered the market.

In the next few decades, one of the main challenges facing our society is to achieve the goal of producing more electricity from renewable energy in our energy system. Solar energy technology plays a decisive role in achieving this goal. “The total amount of electricity produced from photovoltaic energy exceeds 250 TWh, which is approximately equivalent to the electricity produced by 30 nuclear power plants.

In order to meet the goals of international climate change, photovoltaic power generation capacity will be added every year, which will increase tenfold in the next 15 years. In general, in order to meet the needs of the electricity market, solar technology must become more efficient and cost-effective” said Dr., who is the director of the photovoltaic production technology and quality assurance department of the Freiburg Solar System Research Institute in Germany. Dr. Ralf Preu and him His colleague Dr. has made a significant contribution to the development of green laser pointer sintering (LFC) technology, which can produce more efficient solar cells at a lower cost.

650nm 10mW Red Light Laser Pointer Pocket

Today, most solar cells are equipped with a wide metal contact layer covering the back of the silicon wafer, allowing current to flow from the solar cell to the electrodes. This configuration leads to inefficiency. A more efficient alternative was developed in 1989, Passivated Emitter Backside Contact (PERC) solar cell technology. Contrary to traditional battery technology, this technology includes the back reflective layer of the solar cell and thousands of electrical contacts. The LFC process developed by researchers at the German Solar Energy System Research Institute has realized mass industrial production of PERC solar cells for the first time.

Mass production of high-efficiency batteries. A very thin non-conductive layer covers the bottom of the PERC solar cell, between the metal contact layer and the wafer. As a reflector, when sunlight hits the silicon wafer, this non-conductive layer reflects part of the sunlight instead of absorbing it all. Since the front of the battery can also reflect light onto the wafer, the silicon wafer can also capture sunlight, and the efficiency level of the solar cell is improved.