L-精氨酸掺杂钙钛矿太阳电池性能研究

Performance of Perovskite Solar Cells Doped with L-arginine

钙钛矿太阳电池以其优异的性能和发展潜力而成为新能源领域研究热点,但仍然存在缺陷密度大、稳定性差等不足。本研究通过实验对比多种常见氨基酸的掺杂效果后,将小分子有机物L-精氨酸引入钙钛矿前驱体溶液,并通过二元两步法制备钙钛矿太阳电池。L-精氨酸掺杂提升了器件的光电性能,光电效率由18.81%提升到21.86%。L-精氨酸通过降低钙钛矿层缺陷密度(由4.83×10^(16) cm^(-3)降低到3.45×10^(16) cm^(-3)),减少了载流子非辐射复合,延长了载流子的平均寿命,且钙钛矿晶粒尺寸增大、晶界减少、薄膜吸光能力增强且稳定性提升,迟滞效应得到抑制。这是由于L-精氨酸的多种基团与钙钛矿材料作用钝化了缺陷造成的。本研究为钙钛矿太阳电池的性能优化提供了一种借鉴方法。

Perovskite solar cells have become a research hotspot in the field of new energy due to the excellent performance and potential in application,but it still displays some disadvantages such as high defect density and poor stability.In this study,L-arginine,a small molecule of organic matter,was doped into the perovskite precursor solution as compared with the other amino acids,and the perovskite solar cells were prepared by a two-element and two-step preparation method.The test results show that L-arginine doping improves the photoelectric performance of the device,which photoelectric efficiency increases from 18.81%to 21.86%.L-arginine reduces the nonradiative recombination of carriers and increases the average carrier life by reducing the defect density of perovskite layer from 4.83×10^(16) cm^(-3) to 3.45×10^(16) cm^(-3).In addition,the perovskite grain size increases,grain boundaries decrease,the light absorption ability and stability of the film are enhanced,while the hysteresis effect is suppressed.Improvement of the photovoltaic performance is due to the passivation of defects by interaction between multi-groups of L-arginine and perovskite materials.This study provides an optimization method for perovskite solar cells.