Perovskite-Silicon Tandem Solar Cell Efficiency Breaks 34%: LONGi Green Energy Launches GW-Scale Production Line

LONGi Green Energy announced on July 21 in Xi'an that its perovskite-silicon tandem solar cell mass production efficiency has reached 34.2%, setting a new commercial efficiency record for the photovoltaic industry. Simultaneously, the company's first production line with an annual capacity of 1.2GW for perovskite-silicon tandem cells was officially launched.

Tandem cells break through the theoretical efficiency limit of single-junction cells by layering perovskite on top of traditional silicon cells to absorb different wavelengths of sunlight separately. LONGi Central Research Institute director Li Zhenguo stated: "34% was a number once considered the laboratory ceiling. We spent three years solving the stability problem of perovskite layers in outdoor environments, and mass-produced modules have passed the full IEC 61215 reliability test suite."

The production line's levelized cost of electricity (LCOE) is expected to be 22% lower than traditional PERC cells. LONGi has signed a 2GW supply framework agreement with Saudi Arabia's ACWA Power for its photovoltaic power generation project along the Red Sea coast.

However, the trace lead content in perovskite materials remains an environmental concern. LONGi states its cell encapsulation technology can control lead leakage risk to one-tenth of EU RoHS standards and is developing lead-free perovskite alternatives.

The International Energy Agency (IEA) predicts that perovskite-silicon tandem cells will account for over 35% of global new photovoltaic installations by 2032.