AIn₄S₆Cl (A = Rb and Cs) and Pb₅Sn₃Q₁₀Cl₂ (Q = S and Se): quaternary chalcohalides with mixed anionic coordination exhibit photocurrent responses

Abstract

Mixed-anionic compounds have caught considerable attention due to their flexible coordination manners and abundant physical properties. Four new chalcohalides RbIn4S6Cl (1), CsIn4S6Cl (2), Pb5Sn3S10Cl2 (3) and Pb5Sn3Se10Cl2 (4) were successfully...

Mixed Rare-Earth Chalcogenide Borate Eu9–xRExMgS2B20O41 (RE = Sm, Gd) Featuring a 3D {[B20O41]22–}∞ Framework Connected by [B6O9(O0.5)6]6– and [B7O13(O0.5)3]8– Clusters

“…The photocurrent response of 1 reaches ∼1.62 μA/cm 2 , which is slightly smaller than that of Zn 4 B 6 O 12 S (∼2.1 μA/cm 2 ) but larger than that of most known oxychalcogenides or chalcogenides, for example, [(Ba 19 C l4 )­(Ga 6 Si 12 O 42 S 8 )] (∼0.5 μA/cm 2 ), Eu 8 In 17.33 S 34 (∼1.0 μA/cm 2 ), and Tm 4 S 4 Te 3 (∼1.1 μA/cm 2 ) . Sample 2 exhibits a relatively weak photocurrent response with 0.12 μA/cm 2 , and the value is also larger than that of some chalcogenides or chalcohalides, for example, BaCuSbS 3 (∼0.055 μA/cm 2 ), RbIn 4 S 6 Cl (∼0.029 μA/cm 2 ), and Pb 5 Sn 3 S 10 Cl 2 (∼0.019 μA/cm 2 ) . Although isostructural 1 and 2 possess similar DOSs, they exhibit distinct different photocurrent signals that perhaps are induced by their difference in optical band gaps and the radiation intensity’s change of the light source at diverse wavelengths.…”

NaREP2Se6 (RE = Y, Sm, Gd–Dy): Quaternary Rare-Earth Selenophosphates with Unique 3D {[REP2Se6]−}∞ Framework Built by RESe8 and P2Se6 Motifs and Multiple Properties

“…A photocurrent test was conducted to explore the photocatalytic potential of 3 (Figure a). The photocurrent density is 1.8 μA/cm 2 , which is better than most RE chalcogenides like Eu 8 In 17.33 S 34 (∼1.0 μA/cm 2 ), Tm 4 S 4 Te 3 (∼1.1 μA/cm 2 ), Eu 5.4 Sm 3.6 MgS 2 B 20 O 41 (∼1.62 μA/cm 2 ), and RbIn 4 S 6 Cl (∼0.029 μA/cm 2 ) . The RE 3+ ions play an essential role in obtaining a high photocurrent response because the internal 4f–4f electron transition induced rich separation energy levels. , The good photocurrent response of 3 indicates higher separation efficiency of the photogenerated electrons and holes, and the Mott–Schottky plot in Figure b confirms n -type conductivity.…”

Designing complex Pb3SBrxI4−x chalcohalides: tunable emission semiconductors through halide-mixing

“…25 The low dimensionality of Pb 3 SBrI 3 makes it unique among other mixed-halide chalcohalide compositions, 25,26 as these features may be suggestive of anisotropic optical properties that are worth exploring in more detail. 27,28 Furthermore, based on similarities with related quaternary chalcohalides, such as Pb 2 SbS 2 I 3 , we hypothesized that Pb 3 SBrI 3 and other mixed-halide compositions may be accessible using a thiocyanate-based solution-phase synthesis. 21–23…”