Mei Aohan, Peng Xiaocao, Li Xinwei, Zhang Guoge, Lin Shenghuang, Fu Nianqing
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, P. R. China.
Songshan Lake Materials Laboratory, Dongguan 523808, P. R. China.
ACS Appl Mater Interfaces. 2024 Jun 19;16(24):31209-31217. doi: 10.1021/acsami.4c06087. Epub 2024 Jun 4.
Constructing a 1D/3D perovskite heterojunction has recently emerged as a prevalent approach for elevating the efficiency and stability of perovskite solar cells (PSCs), due to the excellent defect-passivation capacity and enhanced resistance to water and oxygen of 1D perovskite. However, the 1D perovskite commonly exhibits much poorer charge carrier transport ability when compared with its 3D counterpart. Tailoring the intrusion depth of a 1D perovskite into the 1D/3D heterojunction is thus of key importance for PSCs but remains a great challenge. We introduce herein a novel anion-regulation strategy that can effectively tune the intrusion behavior of 1D perovskite into 3D perovskite to form a 1D/3D heterojunction with gradual structure and gradient energy-level alignment. This gradual 1D/3D-perovskite interface leads to outstanding defect passivation performance, together with a desired balance between charge transport and moisture/oxygen blocking. Consequently, the PSCs with a 1D/3D perovskite heterojunction resulting from tetra--butylammonium acetate (TBAAc) treatment yield a remarkable enhancement in power conversion efficiency (PCE) from 18.4 to 20.1%. The unencapsulated device also demonstrates excellent stability and retains 90% of its initial PCE after 2400 h of storage in the air atmosphere with 30 ± 5% humidity at 25 ± 5 °C.
构建一维/三维钙钛矿异质结最近已成为提高钙钛矿太阳能电池（PSC）效率和稳定性的一种普遍方法，这归因于一维钙钛矿具有出色的缺陷钝化能力以及增强的抗水和抗氧能力。然而，与三维钙钛矿相比，一维钙钛矿通常表现出差得多的电荷载流子传输能力。因此，调整一维钙钛矿在一维/三维异质结中的侵入深度对于PSC至关重要，但仍然是一个巨大的挑战。我们在此介绍一种新颖的阴离子调控策略，该策略可以有效地调节一维钙钛矿侵入三维钙钛矿的行为，以形成具有渐变结构和梯度能级排列的一维/三维异质结。这种渐变的一维/三维钙钛矿界面导致出色的缺陷钝化性能，以及电荷传输与防潮/防氧之间的理想平衡。因此，经醋酸四丁铵（TBAAc）处理形成一维/三维钙钛矿异质结的PSC的功率转换效率（PCE）从18.4%显著提高到20.1%。未封装的器件还表现出出色的稳定性，在25±5°C、湿度30±5%的空气气氛中储存2400小时后，仍保留其初始PCE的90%。
