A recent study led by Bowen Liang from the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, has unveiled promising advancements in the realm of solar energy technology, specifically through the development of quasi-flat narrow bandgap Copper Indium Gallium Selenium (CIGS) solar cells. This research, published in the journal Energy Material Advances, highlights the potential of CIGS as a bottom cell in tandem solar cells, which could push the efficiency of solar technology beyond the current theoretical limits established by the Shockley–Queisser limit.
The research reveals that traditional CIGS solar cells, typically deposited through a three-stage process, often suffer from incomplete absorption due to double grading. This new approach, which employs single bandgap grading and quasi-flat bandgap designs, allows for enhanced long-wavelength absorption and a higher short-circuit current density (Jsc). As Liang notes, “By optimizing the bandgap of CIGS solar cells, we can achieve efficiencies exceeding 16.5%, regardless of variations in gallium content. This opens up new avenues for improving solar cell performance.”
The implications of this research extend beyond theoretical efficiency. The integration of these advanced CIGS cells with semitransparent inorganic perovskite solar cells has resulted in a remarkable 25.6% efficiency in a four-terminal configuration. This innovation not only enhances energy capture but also presents a commercially viable pathway for the construction sector, where the demand for sustainable and efficient energy solutions is ever-growing.
With the construction industry increasingly focused on reducing carbon footprints and integrating renewable energy sources, the ability to produce more efficient solar cells can significantly impact building design and energy management systems. As Liang emphasizes, “The future of solar technology lies in our ability to innovate and adapt materials for better performance, which is crucial for meeting global energy demands.”
As the construction sector looks to embrace greener technologies, the findings from Liang’s team may lead to a new generation of solar installations that are not only more efficient but also seamlessly integrated into architectural designs. This could foster a shift towards buildings that generate their own energy, contributing to a more sustainable urban landscape.
For those interested in exploring this groundbreaking research further, it was published in Energy Material Advances, a journal dedicated to advancements in energy materials. More information about the lead author can be found at the Shenzhen Institute of Advanced Technology’s website: lead_author_affiliation.
