LONGi announces 30.1% efficiency silicon-perovskite tandem solar cell

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LONGi headquarters
The record is certified by German research organisation Fraunhofer ISE. Image: LONGi Green Energy

Chinese module manufacturer LONGi has announced a commercial M6 size wafer-level silicon-perovskite tandem solar cell with 30.1% efficiency at Intersolar Europe 2024.

LONGi said the record conversion efficiency was certified by German research organisation Fraunhofer Institute for Solar Energy Systems (Fraunhofer ISE).

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He Bo, R&D director of LONGi Central R&D Institute, said that LONGi’s R&D team had overcome two key challenges when developing the cell, including the preparation of large-area perovskite films in air and ultra-low-temperature metallisation.

He added that the new record represented a “milestone in the commercial viability” of the technology.

LONGi established the Central R&D Institute in 2012, which the company described as “the backbone of the company.” Over the past year, the company has invested more than RMB30 billion (US$4.13 billion) in the institute.

Prior to this announcement, LONGi also recently launched a new black dual-glass back contact module with a 22.3% conversion efficiency. Presented at Intersolar 2024 in Munich, Germany, the Hi-MO X6 Artist Ultra Black module generates up to 435W and has a 25-year product warranty and a 30-year power warranty. The modules are designed for the residential, commercial and industrial solar markets and are already available for the European market.

Moreover, it features the company’s proprietary hybrid passivated back contact (HPBC) cells which allow for a gridless and zero busbar (0BB) front for lossless light absorption. The low reflective texture of the HPBC black cell provides deeper light trapping, reducing reflection and a 1.2% light absorption increase.

2 September 2025
Mexico City, Mexico
Intersolar Mexico is the leading platform for technology trends and B2B networking in Mexico's solar market. It focuses on photovoltaics, solar heating and cooling technologies, and energy storage. Together with the co-located events The GREEN Expo® and Aquatech Mexico, it has solidified its position as the largest gathering of professionals in the renewable energy and cleantech industry in Mexico since the debut in 2019. In 2024, the events hosted more than 400 exhibitors as well as 10,000 visitors and 12,000 industry professionals (total attendance). The sixth edition of Intersolar Mexico will take place from September 2 to 4, 2025 at the Citibanamex Center, in Mexico City.
10 March 2026
Frankfurt, Germany
The conference will gather the key stakeholders from PV manufacturing, equipment/materials, policy-making and strategy, capital equipment investment and all interested downstream channels and third-party entities. The goal is simple: to map out PV manufacturing out to 2030 and beyond.

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