Organic photovoltaic cells are notable for their affordability and ease of fabrication over large areas. Their ability to harness sunlight more effectively makes organic solar cells with series laminate configurations particularly advantageous when it comes to achieving high photoelectric energy conversion efficiency, or photovoltaic efficiency. One key component in these configurations is the tunnel junction, which connects the front and rear sub-cells. This junction plays multiple roles, including light transmission, charge collection, and barrier solvent management, significantly influencing overall photovoltaic efficiency. Developing high-performance tunnel junctions remains a major challenge in advancing organic photovoltaic technology.
Recently, Dr. Hou Jianhui from the Polymer Physics and Chemistry Laboratory at the Institute of Chemistry, Chinese Academy of Sciences, made a breakthrough in this area. During experiments involving electron-beam evaporation of titanium dioxide, it was discovered that rutile-phase titanium dioxide could be transformed into an amorphous film. This film is not only uniform and dense but also exhibits excellent acid resistance. As a result, poly(3,4-ethylenedioxythiophene):polystyrene sulfonic acid (PEDOT:PSS) can form a smooth, dense layer on its surface through solution processing. The research team further optimized the chemical composition, electronic energy levels, relative dielectric constant, and doping density of the deposit by precisely controlling the oxygen supplementation rate. Under ideal conditions, the photovoltaic efficiency of stacked organic solar cells utilizing an e-TiO1.76/PEDOT:PSS tunnel junction surpassed 20%.
This study, published in *Joule*, has received support from the National Natural Science Foundation of China, the Chinese Academy of Sciences, and the Beijing National Research Center for Molecular Sciences.
A laminated organic solar cell featuring a tunnel junction with a preparation efficiency of 20.2%, achieved via electron-beam evaporation, exemplifies the progress made in this field. This achievement marks a significant step forward in optimizing organic photovoltaic technology, offering new possibilities for enhancing renewable energy solutions.
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