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

Abstract

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 singlecrystal plates showed a well-defined shape (rectangle or hexagon), a natural thickness (300-500 mm) 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 À13 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.

Perovskite Single Crystals: Synthesis, Optoelectronic Properties, and Application

“…c) Reproduced with permission. [ 88 ] Copyright 2019, published under the terms of CC BY‐NC 3.0. e) Reproduced with permission. [ 79c ] Copyright 2019, Royal Society of Chemistry.…”

“…[ 79b ] Combining cooling and seed growth method for larger crystals, Ran and co‐workers grew centimeter‐sized (PEA) 2 PbBr 4 with a large aspect ratio (≈20) in 4 days (as shown in Figure 8c). [ 88 ]…”

“…As for 2D PVSK SCs grown on the surface of the solution with a very thin thickness, the easiest way to prepare devices is to directly evaporate the electrodes on SCs. Ran and co‐workers [ 88 ] fabricated photodetectors by thermally depositing the Au electrode (channel length of 10 mm) on a SiO 2 substrate, followed by growing centimeter‐sized (PEA) 2 PbBr 4 SC on it. The photodetector exhibited a low dark current of 5.56 × 10 −13 A under a bias of 2.0 V, a high on/off ratio of 10 3 and an effective photoresponse as shown in Figure a.…”

Deciphering the Carrier Transport Properties in Two‐Dimensional Perovskites via Surface‐Enhanced Raman Scattering

“…In order to control the evaporation rate of the solution, a few holes with a diameter of 1 mm were on the plastic plate. The reaction vessel was placed at room temperature, and the transparent crystals appear after 24 h. [44,45,46] Characterization: The optical image was performed by a KEYENCE VK-X200 3D laser scanning microscope. Raman spectra were carried out using a LabRAM HR Evolution Raman spectrometer (Horiba Jobin Yvon).…”

Neuromorphic machine learning for audio processing : from bio-inspiration to biomedical applications

“…Although practical implementation of such a large scale neural network using opto-electrical devices is challenging in its current form. However, new, scalable and reproducible growth methods in halide perovskites continue to be developed [149][150][151]. Numerous demonstrations of large-scale light emitting and photodetector arrays also points to the possibility that such neuromorphic systems could be feasible in future [152].…”