Transition from Dion-Jacobson hybrid layered double perovskites to 1D perovskites for ultraviolet to visible photodetection

• Published in: Chemical science (Cambridge) 2023-09, Vol.14 (36), p.977-9779
• Main Authors: Mandal, Arnab, Gupta, Shresth, Dutta, Supriti, Pati, Swapan K, Bhattacharyya, Sayan
• Format: Article
• Language: English
• Subjects: Chemistry; Mathematical analysis; Optoelectronics; Perovskites; Quantum efficiency
• ISSN: 2041-6520; 2041-6539
• DOI: 10.1039/d3sc01919e

New perovskite phases having diverse optoelectronic properties are the need of the hour. We present five variations of R 2 AgM( iii )X 8 , where R = NH 3 C 4 H 8 NH 3 (4N4) or NH 3 C 6 H 12 NH 3 (6N6); M( iii ) = Bi 3+ or Sb 3+ ; and X = Br − or I − , by tuning the composition of (4N4) 2 AgBiBr 8 , a structurally rich hybrid layered double perovskite (HLDP). (4N4) 2 AgBiBr 8 , (4N4) 2 AgSbBr 8 , and (6N6) 2 AgBiBr 8 crystallize as Dion-Jacobson (DJ) HLDPs, whereas 1D (6N6)SbBr 5 , (4N4)-BiI and (4N4)-SbI have trans -connected chains by corner-shared octahedra. Ag + stays out of the 1D lattice either when SbBr 6 3− distortion is high or if Ag + needs to octahedrally coordinate with I − . Band structure calculations show a direct bandgap for all the bromide phases except (6N6) 2 AgBiBr 8 . (4N4) 2 AgBiBr 8 with lower octahedral tilt shows a maximum UV responsivity of 18.8 ± 0.2 A W −1 and external quantum efficiency (EQE) of 6360 ± 58%, at 2.5 V. When self-powered (0 V), (4N4)-SbI has the best responsivity of 11.7 ± 0.2 mA W −1 under 485 nm visible light, with fast photoresponse ≤100 ms. New lead-free perovskite phases with varying dimensionalities render them with diverse optoelectronic properties from the ultraviolet to visible wavelength range.