LONGi Sets New World Record with 34.85% Efficiency for Perovskite/Crystalline Silicon 2-Terminal Tandem Solar Cell

July 5, 2026

LONGi China

Overview

LONGi, a global leader in solar PV solutions, announced it has achieved a new world record power conversion efficiency of 34.85% for its independently developed crystalline silicon-perovskite 2-terminal tandem solar cell, as verified by NREL. This breakthrough significantly surpasses the theoretical limit of single-junction silicon cells, underscoring LONGi’s strong commitment to driving photovoltaic technology innovation. This high efficiency will contribute to reducing solar power costs and accelerating widespread adoption, critically advancing the global energy transition.

In Depth

Key Findings

LONGi, a preeminent global supplier of solar PV solutions, has announced a groundbreaking achievement: its independently developed crystalline silicon-perovskite 2-terminal tandem solar cell has attained a remarkable 34.85% power conversion efficiency, verified by the U.S. National Renewable Energy Laboratory (NREL). This new world record, an improvement upon previous benchmarks, marks a pivotal milestone in the evolution of photovoltaic technology.

Technical Details

The 34.85% efficiency record significantly exceeds the theoretical Shockley-Queisser limit of approximately 29% for single-junction silicon solar cells. LONGi’s R&D team achieved this by optimizing perovskite material composition, innovating interfacial passivation techniques, and employing precise optical design to efficiently capture a broader spectrum of sunlight. The 2-terminal architecture, in particular, allows for simplified manufacturing and easier module integration while delivering superior efficiency. This technological triumph showcases advanced thin-film deposition techniques and seamless integration with crystalline silicon substrates.

Background & Context

The solar photovoltaic industry is in a perpetual race for higher efficiencies, driven by the urgent need for climate change mitigation and sustainable energy supply. Tandem solar cells, which stack multiple absorber layers with different bandgaps, represent a next-generation technology designed to overcome the efficiency limitations of single-material devices. Continuous record-breaking achievements by industry leaders like LONGi indicate that perovskite tandem technology is transitioning from purely academic success to tangible progress toward commercialization. This advancement is crucial for substantially increasing the power generated per unit area, maximizing energy output from limited land resources.

Strategic Significance & Outlook

Achieving a 34.85% world record demonstrates LONGi’s unparalleled innovation capabilities, further solidifying its competitive edge in the global market. Such high-efficiency technologies are instrumental in reducing balance-of-system (BOS) costs for solar power installations and lowering the overall levelized cost of electricity (LCOE). Moving forward, LONGi is expected to leverage this research outcome to scale up manufacturing processes for larger modules and conduct extensive long-term reliability validations, aiming for the early commercialization of high-efficiency perovskite tandem solar cells. This represents a critical stride towards accelerating the global energy transition and realizing a more sustainable future.

Source: https://www.longi.com/en/

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