钙钛矿(结构)
材料科学
卤化物
结晶学
八面体
单晶
晶体结构
相(物质)
结晶
Crystal(编程语言)
无机化学
化学
计算机科学
有机化学
程序设计语言
作者
Chwenhaw Liao,Chiung‐Han Chen,Jueming Bing,Christopher G. Bailey,Yuanqing Lin,Twishi Mukul Pandit,Laura Granados,Jianghui Zheng,Shi Tang,Bi‐Hsuan Lin,Hung‐Wei Yen,Dane R. McCamey,Brendan J. Kennedy,Chu‐Chen Chueh,Anita Ho‐Baillie
标识
DOI:10.1002/adma.202104782
摘要
Most of the reported 2D Ruddlesden-Popper (RP) lead halide perovskites with the general formula of An+1 Bn X3n+1 (n = 1, 2, …) comprise layered perovskites separated by A-site-substituted organic spacers. To date, only a small number of X-site-substituted RP perovskites have been reported. Herein, the first inorganic-cation pseudohalide 2D phase perovskite single crystal, Cs2 Pb(SCN)2 Br2 , is reported. It is synthesized by the antisolvent vapor-assisted crystallization (AVC) method at room temperature. It exhibits a standard single-layer (n = 1) Ruddlesden-Popper structure described in space group of Pmmn (#59) and has a small separation (d = 1.69 Å) between the perovskite layers. The SCN- anions are found to bend the 2D Pb(SCN)2 Br2 framework slightly into a kite-shaped octahedron, limiting the formation of a quasi-2D perovskite structure (n > 1). This 2D single crystal exhibits a reversible first-order phase transformation to 3D CsPbBr3 (Pm3m #221) at 450 K. It has a low exciton binding energy of 160 meV-one of the lowest for 2D perovskites (n = 1). A Cs2 Pb(SCN)2 Br2 -single-crystal photodetector is demonstrated with respectable responsivity of 8.46 mA W-1 and detectivity of ≈1.2 × 1010 Jones at a low bias voltage of 0.5 V.
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