Recently, supported by the Beijing Science and Technology Commission, Professor Zou Dechun's research team at Peking University has significantly advanced the performance of fiber solar cells. By innovating device structures, they have achieved a photoelectric conversion efficiency of 7.2%, creating fully flexible fiber batteries over 30 cm in length. These devices can power a propeller under natural light, demonstrating their potential for practical use.
In recent years, third-generation solar cell technologies—such as dye-sensitized and organic solar cells—have seen significant progress. However, challenges remain, particularly due to the high cost of transparent conductive electrode materials and the relatively low energy conversion efficiency. These factors have limited the widespread application of these emerging solar cell technologies.
To address these issues, Professor Zou Dechun’s team proposed a novel approach: a flexible fiber solar cell that does not require transparent electrodes. Through continuous process optimization, they successfully fabricated a 35cm x 35cm battery module. The team also developed flexible fiber electrodes and fiber cell units, enabling double-sided fiber solar battery modules. Additionally, they designed a new type of translucent condenser module, taking advantage of the unique three-dimensional light absorption characteristics of fiber-based solar cells.
Beyond this, the project has enabled automation in key stages, including electrode film preparation, device assembly, packaging, and integration. The team has made significant progress in large-scale fabrication, improving both the efficiency and stability of the devices. They have overcome major challenges related to flexibility, size, modularity, and packaging, paving the way for future small-scale applications and commercialization.
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