GCL Optoelectronic Material

GCL System Integration Technology (GCL SI), a company under the GCL Technology Holdings clean‑energy group, together with Soochow University and Yangzhou University, recently initiated drafting group standards for testing and performance verification of 3-terminal crystalline silicon-perovskite tandem solar cells.

GCL SI said that 3-terminal perovskite tandem technology based on back-contact (BC) cells currently faces industrialization challenges due to a lack of unified testing standards, leading to poor data comparability and inconsistent performance evaluation. The proposed standards will address issues such as unique electrode configurations, spectral mismatch, and stability testing by defining testing procedures, parameter definitions, and data processing rules.

GCL Optoelectronics, a unit of GCL Group, has reportedly secured a 1.2 MW commercial perovskite tandem module procurement project launched by Huaneng Clean Energy Research Institute, a key research arm of China Huaneng Group.

GCL Optoelectronics was named the sole winning bidder for the project, which calls for commercial-grade perovskite/silicon heterojunction (HJT) tandem PV modules for an outdoor demonstration power plant to be built by Huaneng. The tender required modules with mass-production conversion efficiency of at least 26%, full IEC 61215 and IEC 61730 certification, supply capability from a production line of at least 100 MW, and outdoor degradation performance consistent with a 25-year service life. Delivery is scheduled by the end of June 2026 and includes a 25-year performance warranty.

Researchers from Jiangsu University, Soochow University, Huaqiao University, GCL System Integration Technology, Chinese Academy of Sciences, The Hong Kong Polytechnic University and Suzhou Maxwell Technologies have reported a high-performance monolithic perovskite–silicon tandem solar cell featuring a steric-complementary interface design. The device achieved a certified efficiency of 32.12%, placing it among the most efficient tandem architectures reported to date and marking a significant advance toward the 40% efficiency threshold targeted for next-generation photovoltaics.

A persistent challenge in perovskite-silicon tandems is mitigating interfacial recombination without compromising either charge extraction or long-term stability. The team addressed this limitation through a Steric-Complementary Synergistic Strategy (SCSS) that fine-tunes the molecular-level interactions across the interface. This strategy employs a pair of size-mismatched cations - small, flexible piperazinium (PipI) and large, rigid phenethylammonium (PEAI) - that perform distinct yet complementary roles. While PipI penetrates deep into the perovskite surface to neutralize atomic-scale defects inaccessible to larger molecules, the bulky PEAI simultaneously assembles into a robust, hydrophobic canopy that shields the interface from environmental stress.

GCL Technology has secured a major investment - US$700 million from Infini Global Master Fund (finalized on November 7, 2025) - with the backing of international and Middle Eastern investors focused on technology. 

The new funds will help GCL's push towards perovskite technology  production and commercialization, and also its production ramp up of materials like polysilicon (used in solar panels) and silane gas (vital for chips and advanced solar cells).

According to reports, GCL Perovskite, the perovskite manufacturing arm of GCL Group, has produced its first full-size perovskite module at its GW-scale production base. The module measures 2.76 m² (2,400 × 1,150 mm), which the company claims is the largest mass-produced and commercialized perovskite module globally.

The GW-scale base, located in Kunshan, Jiangsu Province, has a planned capacity of 2 GW, with the first 1 GW phase having entered operation in June 2025.