Seo Kyeong-Ho, Zhang Xue, Park Jaehoon, Bae Jin-Hyuk
School of Electronic and Electrical Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea.
College of Ocean Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
Nanomaterials (Basel). 2023 Jun 23;13(13):1918. doi: 10.3390/nano13131918.
Lead-free CsAgBiBr perovskites have emerged as a promising, non-toxic, and eco-friendly photovoltaic material with high structural stability and a long lifetime of carrier recombination. However, the poor-light harvesting capability of lead-free CsAgBiBr perovskites due to the large indirect band gap is a critical factor restricting the improvement of its power conversion efficiency, and little information is available about it. Therefore, this study focused on the plasmonic approach, embedded metallic nanospheres in CsAgBiBr perovskite solar cells, and quantitatively investigated their light-harvesting capability via finite-difference time-domain method. Gold and palladium were selected as metallic nanospheres and embedded in a 600 nm thick-CsAgBiBr perovskite layer-based solar cell. Performances, including short-circuit current density, were calculated by tuning the radius of metallic nanospheres. Compared to the reference devices with a short-circuit current density of 14.23 mA/cm, when a gold metallic nanosphere with a radius of 140 nm was embedded, the maximum current density was improved by about 1.6 times to 22.8 mA/cm. On the other hand, when a palladium metallic nanosphere with the same radius was embedded, the maximum current density was improved by about 1.8 times to 25.8 mA/cm.
无铅CsAgBiBr钙钛矿作为一种有前景的、无毒且环保的光伏材料已崭露头角，具有高结构稳定性和长载流子复合寿命。然而，由于间接带隙较大，无铅CsAgBiBr钙钛矿的光捕获能力较差，这是限制其功率转换效率提高的关键因素，且关于这方面的信息很少。因此，本研究聚焦于等离子体方法，在CsAgBiBr钙钛矿太阳能电池中嵌入金属纳米球，并通过时域有限差分法定量研究其光捕获能力。选择金和钯作为金属纳米球，并将其嵌入基于600 nm厚CsAgBiBr钙钛矿层的太阳能电池中。通过调整金属纳米球的半径来计算包括短路电流密度在内的性能。与短路电流密度为14.23 mA/cm²的参考器件相比，当嵌入半径为140 nm的金金属纳米球时，最大电流密度提高了约1.6倍，达到22.8 mA/cm²。另一方面，当嵌入相同半径的钯金属纳米球时，最大电流密度提高了约1.8倍，达到25.8 mA/cm²。
