The large-scale implementation of solar cells and the enhancement of photoelectric conversion efficiency hold immense significance. Among various types of solar cells, copper-zinc-tin-sulfur-selenium (CZTSSe) solar cells stand out as a promising new generation of inorganic thin-film solar cells. These cells boast several key advantages, including abundant raw materials, environmental friendliness, cost-effectiveness, and compatibility with existing industrial technologies. Despite their potential, these cells still have considerable room for improvement in terms of efficiency, making them a vital focus within the realm of clean energy research. At present, boosting the efficiency of CZTSSe solar cells remains a central challenge and priority in this field.
Since 2016, the Clean Energy Laboratory at the Institute of Physics, Chinese Academy of Sciences, along with Beijing National Research Center for Condensed Matter Physics, led by Meng Qingbo's team, has been actively engaged in research on CZTSSe thin-film solar cells. Through deepened physical and chemical insights into CZTSSe materials and devices, the team has achieved significant advancements in recent years. Their work includes analyzing charge losses and defect properties in CZTSSe batteries, regulating metal-molecular coordination in eco-friendly aqueous solutions, controlling the layering crystallization and growth patterns of thin films, and coordinating the management of bulk phase defects. These contributions have been published in notable journals such as *Advanced Materials* (2022, DOI: 10.1002/adma.202202858), *Advanced Energy Materials* (2021, 11, 2102298), *Nano Energy* (2020, 76, 105042), *Science Bulletin* (2020, 65, 738), *Nano Energy* (2020, 89, 106405), and *Joule* (2020, 4, 472).
Most recently, the team achieved another breakthrough in CZTSSe thin-film solar cell research, reaching a certified battery efficiency of 13.6%. This accomplishment not only marks a new world record for CZTSSe battery efficiency but also earned a place in the official battery efficiency statistics table (Version 60), compiled by renowned solar cell expert Martin Green. This milestone underscores the team’s dedication and innovation in advancing clean energy technologies, further solidifying their position at the forefront of global research in this domain.
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