Lu Dan, Fan Jingquan, Ma Xinrui, Geng Mengqi, Li Jialiang, Xu Tingting
School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710129, China.
ACS Appl Mater Interfaces. 2024 Dec 18;16(50):69439-69449. doi: 10.1021/acsami.4c16831. Epub 2024 Dec 9.
Carbon-based perovskite solar cells (C-PSCs) have acquired broad interest due to their superior stability and lower cost compared with metal-based perovskite solar cells (M-PSCs). However, the presence of perovskite defects greatly limits the power conversion efficiency (PCE) and long-term stability of C-PSCs. Herein, a natural dye Congo red molecule containing dual-functional groups of amino and sulfonic acids is first used as a surface passivation agent to treat the surface of perovskite films. High-quality perovskite films with reducing surface defect density and inhibiting nonradiative recombination are obtained. It is shown that the Congo red molecules not only effectively interact with the perovskite, enhancing the crystallization and enlarging the crystal size, but also demonstrate positive contribution for light harvesting in the visible range. The maximum PCE of 16.22% is achieved at the optimal concentration of 0.2 mg/mL Congo red, which is much higher than 13.57% for the control device. After 840 h of storage at 30-40% relative humidity at room temperature, the unencapsulated C-PSCs can still maintain a high initial performance of 87.21% compared with 43.26% for the control cells.
与金属基钙钛矿太阳能电池（M-PSCs）相比，碳基钙钛矿太阳能电池（C-PSCs）因其卓越的稳定性和更低的成本而备受关注。然而，钙钛矿缺陷的存在极大地限制了C-PSCs的功率转换效率（PCE）和长期稳定性。在此，一种含有氨基和磺酸双官能团的天然染料刚果红分子首次被用作表面钝化剂来处理钙钛矿薄膜的表面。获得了具有降低表面缺陷密度和抑制非辐射复合的高质量钙钛矿薄膜。结果表明，刚果红分子不仅能与钙钛矿有效相互作用，增强结晶并增大晶体尺寸，而且在可见光范围内对光捕获也有积极贡献。在刚果红最佳浓度为0.2 mg/mL时，实现了16.22%的最大PCE，这远高于对照器件的13.57%。在室温下相对湿度为30 - 40%的条件下储存840小时后，未封装的C-PSCs与对照电池的43.26%相比，仍能保持87.21%的高初始性能。
