LONGi Breaks World Record Again with 35.5% Efficient Crystalline Silicon-Perovskite Tandem Solar Cell

July 19, 2026

LONGi News China

Overview

LONGi announced a new world record power conversion efficiency of 35.5% for a two-terminal crystalline silicon-perovskite tandem solar cell, certified by the European Solar Test Installation (ESTI). This achievement surpasses LONGi’s previous record of 34.85% from April 2025. The company highlights the continuous technological breakthroughs and the potential of tandem cells to exceed the Shockley–Queisser limit for single-junction cells, accelerating the evolution of photovoltaic technology.

In Depth

Key Findings

LONGi, a global leader in solar technology, has announced a groundbreaking achievement: a new world record power conversion efficiency of 35.5% for a two-terminal crystalline silicon-perovskite tandem solar cell. This remarkable feat was independently certified by the European Solar Test Installation (ESTI) and was presented at the 2026 Solar and Storage Innovation Technology Conference.

Technical Details and Innovation

This latest record surpasses LONGi’s own previous benchmark of 34.85% achieved in April 2025, demonstrating an accelerated pace of innovation within the company. Tandem solar cells, which integrate multiple light-absorbing layers, are designed to overcome the fundamental Shockley–Queisser limit of single-junction cells (theoretically around 33.7%). By optimally combining a silicon bottom cell with a perovskite top cell, LONGi’s technology maximizes photon absorption and charge separation efficiency across a broader spectrum of sunlight. This continuous improvement highlights the rapid maturation of tandem cell technology and its potential to deliver significantly higher energy yields from a given surface area.

Background and Industry Context

The solar photovoltaic industry is relentlessly pursuing higher efficiencies and lower costs to meet global energy demands and combat climate change. Perovskite solar cells, with their unique properties and high intrinsic efficiencies, are at the forefront of this quest. Integrating perovskites with established, high-performance crystalline silicon technology in a tandem configuration is particularly attractive, offering a clear pathway to efficiencies well beyond what silicon alone can achieve. The consistent breaking of efficiency records by major players like LONGi underscores the intense research and development efforts being poured into this field, signaling its growing readiness for widespread commercialization.

Strategic Significance and Outlook

LONGi’s repeated breakthroughs underscore the immense potential of tandem solar cell technology to redefine the performance benchmarks for photovoltaics. Efficiencies exceeding 35% translate directly into higher power output per unit area, making these cells exceptionally valuable for installations where space is constrained or where maximizing energy yield is critical. This progress holds significant promise for reducing the Levelized Cost of Electricity (LCOE) for solar power, thereby accelerating the global transition to clean energy. LONGi is committed to further advancing its tandem cell research and development, aiming to solidify its leadership in a market segment poised for explosive growth and to contribute substantially to a more sustainable energy future.

Source: https://www.longi.com/en/news/crystalline-silicon-perovskite-tandem-solar-cell-new-world-efficiency-2026/

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