| Autor: |
Lu N; Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 106, Taiwan.; Graduate Institute of Energy and Optoelectronic Materials National Taipei University of Technology, Taipei 106, Taiwan (ROC)., Gurumallappa G; Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 106, Taiwan.; Graduate Institute of Energy and Optoelectronic Materials National Taipei University of Technology, Taipei 106, Taiwan (ROC)., Singh J; Department of Physics, Udit Narayan Post Graduate College Padrauna Kushinagar, affiliated by Deen Dayal Upadhyaya Gorakhpur University, Kushinagar 274304, Uttar Pradesh, India., Chan KL; Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 106, Taiwan., Tessema E; Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 106, Taiwan., Liu PY; Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 106, Taiwan., Mylnahalli Krishnegowda H; Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 106, Taiwan., Chimatahalli Shanthakumar K; Department of Chemistry, SJCE, JSS Science and Technology University, Mysuru 570 006, Karnataka, India., Ho JH; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan., Chao YC; Department of Physics, National Taiwan Normal University, Taipei 106, Taiwan., Dao LG; Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan., Shirsat S; Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan., Tsai ML; Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan. |
| Abstrakt: |
Ruddlesden-Popper (RP) two-dimensional (2D) halide perovskite (HP), with attractive structural and optoelectronic properties, has shown great potential in optoelectrical devices. However, the relatively wide bandgap ( E g ) and stability, which cause inferior efficiency, prevent its feasibility from further applications. To tackle these issues, for the first time, a novel fluorine-containing piperidinium spacer, (3-HCF 2 CF 2 CH 2 OCH 2 -PPH + ), abbreviated as (4FH-PPH + ), has been designed for the stable and efficient n = 1 2D HPs. Its fluorophobicity can significantly enhance the noncovalent interactions between cations and [PbI 6 ] 4- octahedra. The observed E g of the fluorinated (4FH-PPH) 2 PbI 4 perovskite is found to be 2.22 eV, which is the lowest value among all fluorinated perovskites reported so far. Interestingly, this fluorinated film-based 2D perovskite photodetector (PD) exhibits the outstanding responsivity of 502 mA W -1 , photodetectivity of 5.73 × 10 10 cm Hz 1/2 W -1 , and impressive response/recovery time of 42/46 ms under 450 nm at 20 V. To the best of our knowledge, it is found for the first time that the 2D HP, with the fluorinated short-chained segment included into the organic spacer, shows remarkable stability for up to 49 days. These results strongly demonstrate the potential of the 2D fluorinated short-chained (4FH-PPH) 2 PbI 4 HP with a low E g as a promising candidate for next-generation optoelectronic devices. |
