New perovskite phases having diverse optoelectronic properties are the need of the hour. We present five variations of RAgM(iii)X, where R = NHCHNH (4N4) or NHCHNH (6N6); M(iii) = Bi or Sb; and X = Br or I, by tuning the composition of (4N4)AgBiBr, a structurally rich hybrid layered double perovskite (HLDP). (4N4)AgBiBr, (4N4)AgSbBr, and (6N6)AgBiBr crystallize as Dion-Jacobson (DJ) HLDPs, whereas 1D (6N6)SbBr, (4N4)-BiI and (4N4)-SbI have -connected chains by corner-shared octahedra. Ag stays out of the 1D lattice either when SbBr 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)AgBiBr. (4N4)AgBiBr with lower octahedral tilt shows a maximum UV responsivity of 18.8 ± 0.2 A W 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 under 485 nm visible light, with fast photoresponse ≤100 ms.
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| http://dx.doi.org/10.1039/d3sc01919e | DOI Listing |
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