Dredging the Charge‐Carrier Transfer Pathway for Efficient Low‐Dimensional Ruddlesden‐Popper Perovskite Solar Cells. (15th February 2023)

• Record Type: Journal Article
• Authors: Li, Pengwei; Yan, Linfang; Cao, Qingli; Liang, Chao; Zhu, He; Peng, Sihui; Yang, Yongpeng; Liang, Yuncai; Zhao, Rudai; Zang, Shuangquan; Zhang, Yiqiang; Song, Yanlin
• Is Part Of: Angewandte Chemie. Volume 135:Number 13(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-02-15
• Subjects: Exciton Binding Energy -- Perovskite -- Ruddlesden-Popper -- Single Crystals -- Solar Cells; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202217910
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: 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)2 MA3 Pb4 I13 (MA=CH3 NH3 + ), 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)2 MA3 Pb4 I13 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. Abstract : A new family of low‐dimensional Ruddlesden‐Popper perovskites (GABA)2 MA n −1 Pb n I3 n +1 ( n =1, 2, 3, 4, MA + =CH3 NH3 + ) with inhibited dielectric confinement were constructed with γ‐aminobutyric acid (GABA) as the spacer cation. The hydrogen bonds between the spacers link the adjacent spacing sheets, enabling the charges localized in the van der Waals gap. The power conversion efficiency of (GABA)2 MA4 Pb5 I16 solar cells with excellent carrier transport properties is up to 18.73 %.