研究目的
Investigating the formation of Cu2ZnSnSe4 light absorbing grains from Cu2ZnSnS4 nanocrystals in a Se-rich atmosphere inside a transmission electron microscope and applying the insights to improve the performance of kesterite solar cells.
研究成果
The study revealed that chalcogen atom exchange and grain growth are distinct processes occurring at different temperature ranges. Improved crystallinity and cation ordering were observed at typical industrial fabrication temperatures. The insights led to an increase in the open circuit voltage of kesterite solar cells, demonstrating a feasible route to improving device performance.
研究不足
The study is limited to the observation of nanoparticle behavior under TEM conditions, which may not fully replicate industrial-scale processes. The decomposition of CZTSe at high temperatures was observed, indicating a limitation in the annealing temperature range.
