LONGi Solar pushes n-type TOPCon cell to record 25.09% conversion efficiency LONGi Solar’s module shipments for 2020 reached a record 24.53GW. Image: LONGi Solar. LONGi Solar has set a new record conversion efficiency for an n-type monocrystalline bifacial TOPCon cell of 25.09%. The company said the achievement, independently verified by the Institute for Solar Energy Research in Hamelin, represents the first time that the efficiency of a TOPCon cell based on a commercial size silicon wafer has exceeded 25%. The announcement comes months after JinkoSolar set a conversion efficiency record of 24.90% for its N-type TOPCon monocrystalline silicon solar cell. “We are aiming to promote continuous upgrading of the PV industry, achieving higher efficiency and more sustainability,” said Li Hua, vice president and head of the cell R&D center of LONGi Solar, adding: “Improving cell conversion efficiency is the main channel for PV technology development.”