Significant improvement in efficiency of third-generation solar cells

Science and Technology Daily, Beijing, February 18 (Reporter Zhang Mengran) According to the latest research published by the British journal Nature Energy, an international joint team has successfully manufactured perovskite/silicon double-layer single chip batteries. Under outdoor conditions, double-sided series solar cells achieve efficiency that exceeds that of any commercial silicon solar panel

Science and Technology Daily, Beijing, February 18 (Reporter Zhang Mengran) According to the latest research published by the British journal Nature Energy, an international joint team has successfully manufactured perovskite/silicon double-layer single chip batteries. Under outdoor conditions, double-sided series solar cells achieve efficiency that exceeds that of any commercial silicon solar panel. This is also the first time that experimental evidence has clearly demonstrated the superior performance of a double-sided series device.

Perovskite solar cells are the third generation solar cells that utilize perovskite type organic metal halide semiconductors as light absorbing materials. They have characteristics such as low cost, high photoelectric conversion efficiency, and huge commercial potential that cannot be ignored.

The research team analyzed the perovskite bandgap required to obtain the optimal current matching under various real lighting and albedo conditions. The new double-sided series solar cell in the study is composed of a silicon layer and a perovskite layer, combined with many other compounds. Due to the use of a narrow perovskite bandgap, the device structure with a transparent back electrode relies on albedo to enhance current generation in the bottom cell and the perovskite top cell.

The team further reported for the first time the results of a double-sided series configuration with a certified power conversion efficiency greater than 25% under single-sided AM1.5G (reference spectrum for solar energy conversion system standard testing) sunlight, and a power generation density of up to 26mWcm-2 in an outdoor experimental field. After comparing the performance exposed to different albedos, the research team concluded that the double-sided monolithic perovskite/silicon tandem solar cell utilizes the diffuse reflected light albedo in the environment, and its performance is superior to that of the single-sided perovskite/silicon tandem solar cell.

Researchers stated that the complexity of serial devices is the main challenge of this study, involving 14 materials, each of which must undergo so-called "perfect optimization".

Although conventional series connected solar cells can also be converted into electricity by absorbing additional wavelengths of light, scientists have demonstrated that using a double-sided series connection configuration can exceed the performance limits of currently recognized series connections. This new system, which utilizes another layer of traditional silicon substrate and perovskite in series, can not only collect more energy, but also capture a lot of wasted light reflected and scattered from the ground, unprecedented increasing the efficiency of series solar cells.

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