Li Pengwei, Yan Linfang, Cao Qingli, Liang Chao, Zhu He, Peng Sihui, Yang Yongpeng, Liang Yuncai, Zhao Rudai, Zang Shuangquan, Zhang Yiqiang, Song Yanlin
College of Chemistry, Zhengzhou university, Zhengzhou, 450001, P. R. China.
Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, 450001, P. R. China.
Angew Chem Int Ed Engl. 2023 Mar 20;62(13):e202217910. doi: 10.1002/anie.202217910. Epub 2023 Feb 15.
Low-dimensional Ruddlesden-Popper (LDRP) perovskites still suffer from inferior carrier transport properties. Here, we demonstrate that efficient exciton dissociation and charge transfer can be achieved in LDRP perovskite by introducing γ-aminobutyric acid (GABA) as a spacer. The hydrogen bonding links adjacent spacing sheets in (GABA) MA Pb I (MA=CH NH ), leading to the charges localized in the van der Waals gap, thereby constructing "charged-bridge" for charge transfer through the spacing region. Additionally, the polarized GABA weakens dielectric confinement, decreasing the (GABA) MA Pb I exciton binding energy as low as ≈73 meV. Benefiting from these merits, the resultant GABA-based solar cell yields a champion power conversion efficiency (PCE) of 18.73 % with enhanced carrier transport properties. Furthermore, the unencapsulated device maintains 92.8 % of its initial PCE under continuous illumination after 1000 h and only lost 3 % of its initial PCE under 65 °C for 500 h.
低维Ruddlesden-Popper（LDRP）钙钛矿的载流子传输性能仍然较差。在此，我们证明通过引入γ-氨基丁酸（GABA）作为间隔层，可以在LDRP钙钛矿中实现有效的激子解离和电荷转移。氢键连接（GABA）MA Pb I（MA = CH NH ）中相邻的间隔层，导致电荷局域在范德华间隙中，从而构建通过间隔区域进行电荷转移的“电荷桥”。此外，极化的GABA减弱了介电限制，将（GABA）MA Pb I激子结合能降低至约73 meV。受益于这些优点，所得基于GABA的太阳能电池产生了18.73%的最佳功率转换效率（PCE），并具有增强的载流子传输性能。此外，未封装的器件在1000小时连续光照下保持其初始PCE的92.8%，在65°C下500小时仅损失其初始PCE的3%。
