Parallel Evaluation of the BiI₃, BiOI, and Ag₃BiI₆ Layered Photoabsorbers

Abstract

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Assessing the Impact of Defects on Lead‐Free Perovskite‐Inspired Photovoltaics via Photoinduced Current Transient Spectroscopy

“…e) Energy levels of the electrode materials, electron-transport materials (ETLs), PIMs, and hole-transport materials (HTLs) used in the PIM devices. [26,51,60,62,80] der Waals interactions; [59,76] and AgBiI 4 , a representative of the rudorffite family with a general formula Ag a Bi b I x (x = a + 3b), which features a three-dimensional lattice of edge-sharing [BiI 6 ] 3or [AgI 6 ] 5octahedra. [77,78] We deposited the representative PIMs via solution-based methods (in the case of Cs 3 Sb 2 I 9 , Rb 3 Sb 2 I 9 , and AgBiI 4 ) or thermal chemical vapor deposition (in the case of BiOI) (details in the Experimental Section and Note S2, Supporting Information).…”

Emerging Indoor Photovoltaic Technologies for Sustainable Internet of Things

“…AgBiI 4 was found to exist in either the Fd m or R m structure, [ 314 ] whereas compounds with x / y > 1 (e.g., Ag 3 BiI 6 and Ag 2 BiI 5 ) favor the R m phase and compounds with x / y < 1 (e.g., AgBi 2 I 7 ) favor the Fd m phase. [ 284,310 ] The bandgaps for these materials were reported to be in the 1.63–1.90 eV range. [ 284,310,311,314–316 ] In particular, the Ag‐rich compound Ag 3 BiI 6 has a bandgap close to the optimum for indoor light harvesting (1.83–1.89 eV), [ 310 ] along with high absorption coefficients of ≈10 5 cm −1 near the band‐edge.…”

“…reported a visual comparison of BiOI and Ag 3 BiI 6 , with Ag 3 BiI 6 changing in color within a week while BiOI exhibited no visual change after several months of storage in ambient conditions. [ 310 ] Sansom et al. also reported that AgBiI 4 decomposed partially to AgI after 144 min of exposure to AM 1.5G radiation in air.…”

Femtosecond relaxation dynamics of two‐dimensional BiOI nanoplatelets as efficient photocatalysts

“…Layered bismuth oxyhalides (BiOX) are among many novel promising two-dimensional materials that have applications in the fields of photocatalysis and photovoltaics. [1][2][3][4][5][6][7] BiOX belongs to semiconductors of the ternary (V-VI-VII) class with a tetragonal-matlockite structure in which a layer of [Bi 2 O 2 ] 2+ is sandwiched between layers of halogen atoms with strong electrovalent bonds. [1][2][3][4][5][6][7] This unique arrangement leads to an asymmetric charge distribution between [Bi 2 O 2 ] 2+ sheets and halogen sheets; as a result, an internal static electric field is produced perpendicular to the direction of the halogen atoms along the [001] facet of BiOX.…”

“…[1][2][3][4][5][6][7] BiOX belongs to semiconductors of the ternary (V-VI-VII) class with a tetragonal-matlockite structure in which a layer of [Bi 2 O 2 ] 2+ is sandwiched between layers of halogen atoms with strong electrovalent bonds. [1][2][3][4][5][6][7] This unique arrangement leads to an asymmetric charge distribution between [Bi 2 O 2 ] 2+ sheets and halogen sheets; as a result, an internal static electric field is produced perpendicular to the direction of the halogen atoms along the [001] facet of BiOX. [1][2][3][4][5][6][7] This internal electric field plays a prominent role in chargecarrier separation in BiOX photocatalysts, and is responsible also for their enhanced photocatalytic properties.…”