Noh Young Wook, Ha Jung Min, Son Jung Geon, Han Jongmin, Lee Heunjeong, Kim Dae Woo, Jee Min Hun, Shin Woo Gyeong, Cho Shinuk, Kim Jin Young, Song Myoung Hoon, Woo Han Young
School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, 44919, Republic of Korea.
Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
Mater Horiz. 2024 Jun 17;11(12):2926-2936. doi: 10.1039/d4mh00253a.
Recently, inverted perovskite solar cells (PeSCs) have witnessed significant advancements; however, their long-term stability remains a challenge because of the oxidation of silver cathodes to form AgI by mobile iodides. To overcome this problem, we propose the integration of an electron-deficient naphthalene diimide-based zwitterion (NDI-ZI) as the cathode interlayer. Compared to the physical ion-blocking layer, it effectively captures ions by forming ionic bonds electrostatic Coulombic interaction to suppress the migration of iodide and Ag ions. The NDI-ZI interlayer also suppresses the shunt paths and modulates the work function of the Ag electrode by forming interface dipoles, thereby enhancing charge extraction. FACsPbI based PeSCs incorporating NDI-ZI exhibited a noticeably high power conversion efficiency of up to 23.3% and outstanding stability, maintaining ∼80% of their initial performance over 1500 h at 85 °C and over 500 h under continuous 1-sun illumination. This study highlights the potential of a zwitterionic cathode interlayer in diverse perovskite optoelectronic devices, leading to their improved efficiency and stability.
最近，倒置钙钛矿太阳能电池（PeSCs）取得了显著进展；然而，由于银阴极被移动的碘化物氧化形成AgI，其长期稳定性仍然是一个挑战。为了克服这个问题，我们提出集成一种缺电子的萘二亚胺基两性离子（NDI-ZI）作为阴极夹层。与物理离子阻挡层相比，它通过形成离子键（静电库仑相互作用）有效地捕获离子，以抑制碘化物和银离子的迁移。NDI-ZI夹层还通过形成界面偶极抑制分流路径并调节银电极的功函数，从而增强电荷提取。采用NDI-ZI的基于FACsPbI的PeSCs表现出高达23.3%的显著高功率转换效率和出色的稳定性，在85°C下1500小时内保持其初始性能的约80%，在持续1个太阳光照下超过500小时。这项研究突出了两性离子阴极夹层在各种钙钛矿光电器件中的潜力，从而提高其效率和稳定性。
