Abstract
Steering the crystallization of two-dimensional (2D) perovskite film is an important strategy to improve the power conversion efficiency (PCE) of 2D perovskite solar cells (PVSCs). In this paper, the deionized water (H2O) additive is introduced into the perovskite precursor solution to prepare high-quality 2D perovskite films. The 2D perovskite film treated with 3% H2O shows a good surface morphology, increased crystal size, enhanced crystallinity, preferred orientation, and low defect density. The fabricated 2D PVSC with 3% H2O exhibits a higher PCE compared with that without H2O (12.15% vs 2.29%). Furthermore, the shelf stability of unsealed devices with 3% H2O under ambient environment is significantly improved. This work provides a simple method to prepare high-quality 2D perovskite films for efficient and stable 2D PVSCs.
Highlights
We found that dimethyl sulfoxide (DMSO) and thiosemicarbazide (TSC) exhibit a synergistic effect in improving the morphology, crystallization, and orientation of 2D perovskite films [14]
The power conversion efficiency (PCE) of the champion device with 3% H2O stabilizes at 11.78% with a photocurrent density of 14.02 mA/cm2 in Doping ratio Circuit voltage (Voc) (V) Short-circuit current density (Jsc) fill factor (FF) (%) PCEmax (%) PCEavg (%)
In conclusion, we have investigated the effects of H2O additive on 2D BA2MA3Pb4I13 perovskite thin films and the corresponding device performance
Summary
Two-dimensional (2D) layered perovskites have drawn extensive attention due to their enhanced moisture resistance versus their 3D counterparts, such as CH3NH3PbI3 (MAPbI3) and HC(NH2)2PbI3 (FAPbI3). The 2D perovskite with the formula of A2Bn − 1MnX3n + 1 (Ruddlesden−Popper phase), where B is MA+, FA+, or Cs+, M is Pb2+ or Sn2+, X stands for halide anion, n refers to the number of planes of the corner-sharing [MX6]4− octahedral, can be formed by incorporating organic long-chain ligands A (such as phenethylammonium (PEA+) or butylammonium (BA+)) in the inorganic framework. To obtain high-performance 2D PVSCs, many efforts have been made, including the hot-coasting [7], additive engineering [8–14], composition engineering [15–26], precursor solvent engineering [27–30], interfacial engineering [31–35], and other special treatments [13, 36, 37]. The PCE of 2D PVSCs drastically increases from 0.56 to 11.01%
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