Dr. Xu Jun and his team at the Oak Ridge National Laboratory recently proposed a 3-D nanocell-based solar cell, which is said to be capable of photoelectric conversion. Efficiency increased by 80%. The nano-conical structure is made of n-type zinc oxide for conducting electrons. The conical structure is also covered with a layer of p-type polycrystalline cadmium telluride to form a PN junction and used to absorb photons and conduct air. hole.
"In order to improve the efficiency of the battery, we have created this nano-cone solar cell structure, proposed a corresponding production process, and proved that this structure can indeed improve the charge collection efficiency," said Dr. Xu Jun of the Oak Ridge National Laboratory Chemistry Institute.
Dr. Xu Jun and his team have already used this structure to produce a battery with a conversion efficiency of 3.2%, while the general flat-panel battery using the same material has an efficiency of only 1.8%. The researchers pointed out that it is the unique electric field distribution of the structure that improves the photoelectric conversion efficiency, and the economically viable nanocone manufacturing process and methods for reducing defects in semiconductor materials are equally important. The research team stated that due to the increased electron transfer efficiency, the battery can be made of lower grade materials, thereby reducing costs.
“Our three-dimensional structure has a unique built-in electric field distribution, which can improve charge transfer efficiency and ultimately improve photoelectric conversion efficiency,†said Dr. Xu Jun. “The core part of our design is the high-strength electric field generated by the nano-cone tip. It can effectively separate, inject and collect minority carriers to achieve higher conversion efficiency than traditional flat plate structures."
The IEEE Photovoltaic Experts Conference has accepted two papers on the three-dimensional nanocones, "Efficient charge Transportin Nanocone Tip-Film SolarCells" and "Nanojunction solarcells based on polycrystalline CdTe films grownon ZnO nanocones", and will be assembled with other papers. publishing.
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