What’s Hot?Following the overview of major technological improvements in mass production, Ye highlighted key advancements for 2024. He explained that the lower conductivity of the cell’s emitter region, which is affected by the amorphous silicon (a-Si) layers on both sides, cannot alone ensure the cell's high efficiency, thus requiring an electrical solution. Risen has addressed this challenge with a thin Transparent Conductive Oxide (TCO) layer on both the front and rear surfaces, offering high conductivity, light transmittance, and anti-reflective properties. To deposit this thin layer, the company employs field deposition processes like target material sputtering, where high-speed ion beams bombard the target material, causing atoms to sputter and deposit onto a substrate, forming a thin film. The key to achieving higher cell efficiency lies in 3 critical properties of the TCO layer: low resistivity, high transmittance, and the ability for low-temperature growth. Risen has opted to increase carrier mobility rather than carrier concentration to achieve low resistivity at the cell surface. The carrier concentration route leads to higher light absorption and reduced transmittance, leading to lower cell efficiency.Moreover, the company has replaced traditional screen printing technology with stencil mesh (knotless) printing technology. This method features a fully open mesh, higher paste transmittance, and a longer printing lifespan in the metallization process. The new technology reduces finger width to less than 25 µm, minimizing shading and increasing the area available for light absorption. It also enhances printing quality, achieving an aspect ratio of up to 46%, compared to just 28% with conventional mesh technology. Additionally, Risen has incorporated UV-down conversion film, which utilizes the Stokes shift principle to convert high-frequency, high-energy UV light into low-frequency visible blue light. This results in an additional power gain of 10 W compared to conventional UV cut-off films.Hyper-ion ProThe technological advancements described above have culminated in Risen’s upcoming Hyper-ion Pro series 730 Wp+ HJT module, which is expected to enter mass production in Q1 2025. This module, featuring 132 HJT cells, will deliver a power output of up to 740 Wp and an efficiency of up to 23.8%.
