Preparation of two-dimensional Cs3Bi2I9 thin films by chemical vapor deposition to enhance the efficiency and stability of lead-free perovskite solar cells

The preparation route of two-dimensional lead-free perovskite thin films

A study published in Volume 310 of Solar Energy Materials and Solar Cells reported the deposition of two-dimensional Cs3Bi2I9 thin films using chemical vapor deposition (CVD) method and their application in efficient and stable lead-free perovskite solar cells. The authors of this study are Gunasekaran Ashokan, Gowthambabu Vellingiri, Sadhasivam Subramani, and Jeganathan Kulandaivel. The paper was published online on January 15, 2027. From the perspective of material system, Cs3Bi2I9 belongs to bismuth based lead-free perovskite, and its two-dimensional structure is an important feature that distinguishes it from conventional three-dimensional perovskite. The study of chemical vapor deposition as a thin film deposition method has engineering discussion value in terms of film uniformity and large-scale deposition. The title of the paper emphasizes both the goals of “efficiency” and “stability”, indicating that this work not only focuses on photoelectric conversion efficiency, but also regards device stability as the core examination content.

Insights for the Photovoltaic Materials and Polymer Additives Industry

Perovskite solar cells are a highly anticipated technological direction in the field of new energy materials, and their industrialization cannot be separated from packaging and weather resistance issues.

. Although the study focuses on the inorganic lead-free perovskite absorber layer itself and does not involve polymer additive formulations, its emphasis on stability echoes the issues of humidity, light, and oxygen erosion faced by photovoltaic modules during long-term outdoor operation. For photovoltaic backsheet and packaging materials, how to improve weather stability while maintaining transparency and bonding performance has always been a key focus of formula design; Antioxidants and other additives have a clear role in inhibiting photo oxidative aging of polymer materials and extending the service life of packaging systems. From a technical perspective, lead-free technology is one of the directions for reducing material environmental risks in perovskite photovoltaics, and the CVD deposition of two-dimensional Cs3Bi2I9 thin films provides a reference process for the preparation of absorption layers. For polymer additive companies, the maturity of this new type of battery technology will drive differentiated demands for supporting packaging materials: on the one hand, the packaging film needs to maintain process compatibility with the new absorption layer and transport layer; On the other hand, the backplate and packaging materials need to maintain weather stability for a longer warranty period, which puts higher demands on the aging protection system with antioxidants as the core. The application of polymer materials such as energy storage and hydrogen energy also focuses on long-term stability, and the weather resistance experience in the photovoltaic field has cross disciplinary reference significance.

Industrialization variables that still need attention

It should be pointed out that this study reports the results of thin film deposition and batteries at the laboratory level, and the abstract information does not disclose specific efficiency values, stability testing conditions, and key engineering parameters such as component size.

. The transition of lead-free perovskite from thin film preparation to large-scale components requires continuous validation in terms of area enlargement, process repeatability, and packaging compatibility. For the polymer additive industry, tracking changes in packaging demand for such new photovoltaic materials is more practical than short-term efficiency figures.

Information source:Two-dimensional Cs₃Bi₂I₉ thin films deposited by chemical vapour deposition for efficient and stable lead-free perovskite solar cells， Organized by Herun Chemical.