A groundbreaking study reveals that silver doping dramatically boosts the efficiency of kesterite solar cells. This innovation could revolutionize affordable and sustainable solar energy production.
A collaborative research effort has paved the way for a significant leap in solar technology, promising a future where clean, affordable energy is within reach. A team of senior researchers from Daegu Gyeongbuk Institute of Science & Technology (DGIST), Incheon National University and Kyung Hee University have announced a breakthrough in the efficiency of kesterite (CZTSSe) thin-film solar cells using a novel silver (Ag) doping method.
Kesterite solar cells, composed of abundant elements such as copper, zinc, tin, sulfur and selenium, are celebrated for their eco-friendly properties and potential for large-scale production. However, these cells have struggled with performance issues, particularly regarding efficiency and electron-hole recombination losses, hindering their commercialization.
The researchers have tackled these challenges head-on by introducing Ag doping into the solar cell precursors. This innovative process lessens defects, promotes crystal growth and prevents the loss of critical elements such as tin (Sn). The result is a significant boost in the solar cells’ efficiency, making them more viable for widespread use.
“In this study, we analyzed the effect of Ag doping, which had not been clearly identified before, process by process, and found that silver plays a role in suppressing tin loss and improving defects,” Kee-jeong Yang, a senior researcher in the Division of Energy & Environmental Technology at DGIST, said in a news release. “The results provide important insights into the design of silver-doped precursor structures to improve solar cell efficiency and are expected to contribute to the development of various solar cell technologies.”
The research team meticulously examined the impact of Ag doping at different stages and locations within the solar cell structure. Their findings highlighted that correctly placed Ag enhances crystal growth and defect reduction, leading to smoother charge transport and improved overall performance. Conversely, improper Ag placement can lead to detrimental defect clusters, underscoring the critical importance of precision in the doping process.
Moreover, the study revealed that the liquid intermediary formed through Ag doping significantly enhances the density and crystallinity of the absorber layer. This advancement in structural integrity translates into better energy band structures and fewer defects, culminating in a more efficient solar cell.
The implications of this research are profound. By developing a cost-effective method to boost the efficiency of kesterite solar cells, this breakthrough holds the potential to make solar energy more accessible and affordable. The work not only contributes to the advancement of solar technology but also aligns with global efforts towards sustainable and carbon-neutral energy solutions.
This research is published in the journal Energy & Environmental Science.