Cao Fangfang, Du Liming, Jiang Yongjie, Gou Yangyang, Liu Xirui, Wu Haodong, Zhang Junchuan, Qiu Zhiheng, Li Can, Ye Jichun, Li Zhen, Xiao Chuanxiao
School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China.
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Nanomaterials (Basel). 2024 Jun 1;14(11):963. doi: 10.3390/nano14110963.
Light-induced phase segregation, particularly when incorporating bromine to widen the bandgap, presents significant challenges to the stability and commercialization of perovskite solar cells. This study explores the influence of hole transport layers, specifically poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine (PTAA) and [4-(3,6-dimethyl-9H-carbazol-9-yl)butyl]phosphonic acid (Me-4PACz), on the dynamics of phase segregation. Through detailed characterization of the buried interface, we demonstrate that Me-4PACz enhances perovskite photostability, surpassing the performance of PTAA. Nanoscale analyses using in situ Kelvin probe force microscopy and quantitative nanomechanical mapping techniques elucidate defect distribution at the buried interface during phase segregation, highlighting the critical role of substrate wettability in perovskite growth and interface integrity. The integration of these characterization techniques provides a thorough understanding of the impact of the buried bottom interface on perovskite growth and phase segregation.
光致相分离，尤其是在引入溴以拓宽带隙时，对钙钛矿太阳能电池的稳定性和商业化提出了重大挑战。本研究探讨了空穴传输层，特别是聚双(4-苯基)(2,4,6-三甲基苯基)胺和[4-(3,6-二甲基-9H-咔唑-9-基)丁基]膦酸(Me-4PACz)对相分离动力学的影响。通过对掩埋界面的详细表征，我们证明Me-4PACz增强了钙钛矿的光稳定性，超过了PTAA的性能。使用原位开尔文探针力显微镜和定量纳米力学映射技术的纳米级分析阐明了相分离过程中掩埋界面处的缺陷分布，突出了衬底润湿性在钙钛矿生长和界面完整性中的关键作用。这些表征技术的整合提供了对掩埋底部界面对钙钛矿生长和相分离影响的全面理解。
