Feng Zhiying, Wu Zhixing, Hua Yikun, Weng Chaocang, Chen Xiaohong, Huang Sumei
Engineering Research Center for Nanophotonics & Advanced Instrument, Ministry of Education, School of Physics and Electronic Science, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, P. R. China.
ACS Appl Mater Interfaces. 2022 Mar 30;14(12):14388-14399. doi: 10.1021/acsami.1c20923. Epub 2022 Mar 16.
Organic-inorganic perovskite solar cells (PSCs) provide one of the most outstanding photovoltaic (PV) technologies, yet their efficiency, stability, and defect passivation engineering still remain challenging. We demonstrate the use of low-cost, eco-friendly, and multi-functional aza-dipyrromethene (Aza-DIPY) dye molecules to promote the power conversion efficiency (PCE) and the operating stability of PSC devices. The Aza-DIPY dye was meticulously synthesized and incorporated into PSC devices via a one-step solution processing approach. The pyrrole, benzene ring, and chlorine functional groups on the dye have intense interactions with perovskite to passivate surface defects and obtain high-quality perovskite absorbers, resulting in the lengthened carrier recombination time and enhanced fill factor of PSCs. Additionally, the hydrophobic phenyl and halogen functional groups on the Aza-DIPY perform as a protecting barrier against moisture and ameliorate the stability of PSCs. As a consequence, the PV performance of PSCs is considerably improved, with the average PCE increased from 16.71% to 19.71%, and the champion device with Aza-DIPY shows a PCE of 20.46%. The unencapsulated PSC devices with multi-functional molecular Aza-DIPY maintains 89.06% of their beginning PCEs after storage in ambient air (25-30 °C, 50-70% relative humidity) under dark conditions for 100 h, exhibiting a significantly enhanced ambient stability compared with the case of the reference cells without the dye. Furthermore, the Aza-DIPY-modified PSC devices exhibit strong and reversible photoresponses, with a high responsivity of 0.739 mA/W to near-infrared (NIR) laser beams. Our results highlight the potential of synthesizing multi-functional Aza-DIPY dyes-incorporated PSC devices with sensitive NIR/visible light responses, high PV efficiency, and stability.
有机-无机钙钛矿太阳能电池（PSC）是最杰出的光伏（PV）技术之一，但其效率、稳定性和缺陷钝化工程仍然具有挑战性。我们展示了使用低成本、环保且多功能的氮杂二吡咯亚甲基（Aza-DIPY）染料分子来提高PSC器件的功率转换效率（PCE）和运行稳定性。Aza-DIPY染料经过精心合成，并通过一步溶液处理方法整合到PSC器件中。染料上的吡咯、苯环和氯官能团与钙钛矿有强烈的相互作用，以钝化表面缺陷并获得高质量的钙钛矿吸收层，从而延长了PSC的载流子复合时间并提高了填充因子。此外，Aza-DIPY上的疏水苯基和卤素官能团起到防潮保护屏障的作用，改善了PSC的稳定性。因此，PSC的光伏性能得到显著提高，平均PCE从16.71%提高到19.71%，含Aza-DIPY的冠军器件显示出20.46%的PCE。具有多功能分子Aza-DIPY的未封装PSC器件在黑暗条件下于环境空气（25-30°C，相对湿度50-70%）中储存100小时后，仍保持其初始PCE的89.06%，与不含染料的参考电池相比，其环境稳定性显著增强。此外，Aza-DIPY修饰的PSC器件表现出强烈且可逆的光响应，对近红外（NIR）激光束具有0.739 mA/W的高响应度。我们的结果突出了合成具有敏感近红外/可见光响应、高光伏效率和稳定性的多功能含Aza-DIPY染料的PSC器件的潜力。
