A lead-free layered Dion–Jacobson hybrid double perovskite constructed by an aromatic diammonium cation

Abstract

A two-dimensional (2D) Dion-Jacobson (DJ) lead-free semiconductive hybrid double perovskite (HDP) [(3AMPY)2AgBiI8·H2O] (3AMPY=3-(aminomethyl) pyridinium) (1) has been reported, which shows an attractive band gap of 1.86 eV. Importantly, 1 is...

[SMe3]2[Bi2Ag2I10], a silver iodido bismuthate with an unusually small band gap

“…This fits well into the ranges that are typically found for iodido antimonates and bismuthates. 43 1 on the other hand has an optical band gap of 1.82 eV, which is similar to those found in 2D elpasolites, such as [(3AMPY) 2 AgBiI 8 •H 2 O] (3AMPY = 3-(aminomethyl) pyridinium) 21 and (4FPEA) 4 AgBiI 8 (4FPEA = 4-fluorophenethylammonium) 44 with optical band gaps of 1.86 eV and 1.84 eV, respectively. Importantly, the band gap is significantly smaller than the 2.05 eV and 1.92 eV reported for the aforementioned and structurally very similar [NEt 4 ] 2 [Bi 2 Ag 2 I 10 ] 23 and [1,3,5-Me 3 py] 2 [Bi 2 Ag 2 I 10 ], 26 respectively.…”

Hybrid Layered Double Perovskite Halides of Transition Metals

“…Typical examples include (1,4-BDA)2AgBiBr8, 4 (AE2T)2AgBiI8, 5 (AMP)4[AgBiI8]2•H2O, 6 (CHDA)2CuBiI8•0.5H2O, 7 (CHDA)2AgBiI8.H2O, 7 (MPDA)2CuBiI8, 8 and (3AMPY)2AgBiI8•H2O (Table S1). [9][10][11] There has separately been considerable progress in the development of layered single perovskite halides of 2+ transition metals (TMs). [12][13][14][15][16] In addition, there is a report of mixed-valence Au + /Au 3+ based perovskite iodides containing [Au I Au III I6] 2layers of linear [Au I I2]and square planar [Au III I4]ions.…”

Silver‐Bismuth Based 2D Double Perovskites (4FPEA)4AgBiX8 (X = Cl, Br, I): Highly Oriented Thin Films with Large Domain Sizes and Ultrafast Charge‐Carrier Localization

“…Contrarily, while the DJ phases have an intrinsically stronger interlayer connectivity by binding one organic layer to two adjacent inorganic layers through the divalent character, RP phases also require a strong interaction between organic spacer molecules along the outof-plane direction. As of now, this synthetic difficulty has only yielded a small, but growing number of published structures, namely (CHD) 2 AgBiI 8 •H 2 O (CHD = 1,4-cyclohexandiamine), [43] (AE2T) 2 AgBiI 8 (AE2T = 5,5′-diylbis(aminoethyl)-[2,2′-bithiophene]), [34] (3AMPY) 2 AgBiI 8 (3AMPY = 3-(aminomethyl) pyridinium), [44] (4AMP) 2 AgBiI 8 (4AMP = (4-(aminomethyl) piperidinium), [45] (3IPA) 4 AgBiI 8 (IPA = 3-iodopropylammonium), [33] (4IBA) 4 AgBiI 8 (IBA = 4-iodobutylammonium), [46] (4AMP) 4 AgBiI 8 , [47] (APP) 4 AgBiI 8 (APP = 4-aminopiperidinium) and (β-MPA) 4 AgBiI 8 (β-MPA = β-methylphenethylammonium). [48] In our work, we used the simple modification of the PEA + cation to the 4FPEA + cation to achieve the stabilizing and templating effect.…”