New publication: Advancements in CuGaSe2 Solar Cells Through Silver Alloying

Image: Uppsala University

SITA researchers have made significant progress in solar cell technology with the development of silver-alloyed CuGaSe₂ (ACGS) solar cells. This innovative work, recently published in Solar RRL, explores the impact of silver alloying, stoichiometry, and deposition temperature on the efficiency of wide-gap ACGS absorber films.

The team observed that silver addition enhances carrier collection by widening the space charge region. Devices featuring a (Zn,Sn)O buffer achieved superior efficiency compared to traditional CdS buffers. The most efficient cell reached 11.6% efficiency with an antireflection coating, alongside impressive metrics such as an open-circuit voltage of 985 mV and a short-circuit current density of 18.6 mA/cm². These results were obtained for an absorber processed at 650°C with optimal stoichiometry.

This breakthrough not only advances the performance of wide-gap solar cells but also aligns with SITA’s goal of creating highly efficient and durable tandem solar modules. The research highlights the potential of silver alloying to optimise photovoltaic performance while mitigating recombination losses at the interface.

For more information, read the full article here​.