Zhao Baohua, Zhang Teng, Song Chenhao, Zhu Shihui, Wang Tailin, Sun Xinyu, Liu Heyuan, Chen YanLi, Li Xiyou
College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
ACS Appl Mater Interfaces. 2024 Aug 7;16(31):41684-41693. doi: 10.1021/acsami.4c07458. Epub 2024 Jul 26.
Very recently, the poor contact between the perovskite and carrier selective layer has been regarded as a critical issue for improving the performance and stability of perovskite solar cells (PSCs). In this study, the buried interface of regularly structured PSCs has been targeted. Glutathione-coated gold nanoparticles (GSH-AuNPs) are used as double-sided passivating agents to improve the quality of the perovskite films. It has been demonstrated that the GSH-AuNPs interact strongly with the SnO underlayer and the upper perovskite layer, significantly reducing the defect densities of this interface. Thus, the power conversion efficiency (PCE) of the PSCs can be increased from 20.46% (control, 19.38%, IPCE corrected) to 22.22% (GSH-AuNPs modified, 21.10%, IPCE corrected) with notable enhancement in Voc and FF. Moreover, the strong interaction between the C═O groups of GSH-AuNPs and the undercoordinated Pb species of the perovskite films inhibits the formation of metallic Pb. As a result, the unencapsulated GSH-AuNPs-modified devices retained 80% of their initial PCEs after 1000 h at ambient conditions, with a relative humidity (RH) of 60 ± 5%. UV-resistant PSCs have also been demonstrated after introducing GSH-AuNPs. Therefore, our findings demonstrate the bidirectional therapy strategy as a feasible approach for achieving efficient and UV-resistant PSCs.
最近，钙钛矿与载流子选择性层之间的不良接触被认为是提高钙钛矿太阳能电池（PSC）性能和稳定性的关键问题。在本研究中，将规则结构PSC的掩埋界面作为研究对象。用谷胱甘肽包覆的金纳米颗粒（GSH-AuNPs）作为双面钝化剂来提高钙钛矿薄膜的质量。结果表明，GSH-AuNPs与下层的SnO和上层的钙钛矿层强烈相互作用，显著降低了该界面的缺陷密度。因此，PSC的功率转换效率（PCE）可从20.46%（对照，经IPCE校正后为19.38%）提高到22.22%（GSH-AuNPs修饰，经IPCE校正后为21.10%），同时开路电压（Voc）和填充因子（FF）显著提高。此外，GSH-AuNPs的C═O基团与钙钛矿薄膜中配位不足的Pb物种之间的强相互作用抑制了金属Pb的形成。结果，未封装的GSH-AuNPs修饰器件在环境条件下（相对湿度（RH）为60±5%）放置1000小时后仍保留其初始PCE的80%。引入GSH-AuNPs后还展示了抗紫外线的PSC。因此，我们的研究结果证明了双向治疗策略是实现高效且抗紫外线PSC的可行方法。
