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Centimeter-scale 2D perovskite (PEA)2PbBr4 single crystal plates grown by a seeded solution method for photodetectors

机译:通过种子溶液法生长用于光电探测器的厘米级2D钙钛矿(PEA)2PbBr4单晶板

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Large-sized single-crystal two-dimensional (2D) perovskites are highly desirable owing to their fundamental properties and intriguing ability to boost devices. Herein, 2-phenylethylammonium lead bromide [(PEA) _(2) PbBr _(4) ] single crystals, which are a violet-light-emitting 2D perovskite material, with typical lateral sizes of about one centimeter were successfully grown using a seeded solution method. The single-crystal plates showed a well-defined shape (rectangle or hexagon), a natural thickness (300–500 μm) similar to that of conventional silicon and InP wafers, a large aspect ratio of ~20, and a smooth surface (root mean square, ~0.7 nm). We integrated these single crystal plates into an ultraviolet photodetector, achieving a low dark current of ~10 ~(?13) A and an efficient photoresponse (on/off ratio, ~10 ~(3) ). This experiment could easily be extended to grow freestanding 2D perovskite single crystals on a wafer scale for practical integrated optoelectronics.
机译:大型单晶二维(2D)钙钛矿由于其基本特性和增强器件的吸引力而非常受人们欢迎。在此,使用籽晶成功地生长了2-苯基乙基铵溴化铅[(PEA)_(2)PbBr _(4)],这是一种发出紫光的二维钙钛矿材料,典型的横向尺寸约为一厘米。解决方法。单晶板具有清晰的形状(矩形或六边形),与常规硅和InP晶片相似的自然厚度(300-500μm),宽高比约为20,表面光滑(根均方根,约0.7 nm)。我们将这些单晶板集成到紫外光电探测器中,实现了约10〜(?13)A的低暗电流和有效的光响应(开/关比为〜10〜(3))。可以轻松地扩展该实验,以在晶圆级上生产独立的2D钙钛矿单晶,以用于实用的集成光电。

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