A light-emitting device based on perovskite flakes and its preparation method
A light-emitting device, perovskite technology, applied in semiconductor/solid-state device manufacturing, semiconductor devices, electric solid-state devices, etc. Difficult to light-emitting devices and other problems, to achieve the effect of high carrier mobility, simple process, and high luminous efficiency
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Embodiment 1
[0031] The preparation of large-area perovskite flakes is as follows.
[0032] 1. Using the method of continuous growth, the fresh CH 3 NH 3 I and PbI 2 The mixed solution was continuously injected into the crystal growth container to maintain the crystal growth solution at a constant concentration to ensure the continuity and uniformity of the crystal growth process, so as to obtain a single crystal CH with a size of 15 mm × 15 mm × 5 mm. 3 NH 3 PB 3 , the luminescence peak of the crystal is detected at 780nm;
[0033] 2. Using the method of mortar cutting, in which the speed of the sand line movement is 3mm / s, the large-size perovskite crystal is cut to obtain an area of 200mm 2 , perovskite flakes with a thickness of 100 μm;
[0034] 3. Use ultrasonic cleaning to remove the mortar on the surface of the perovskite sheet;
[0035] 4. Using a mechanical polishing machine, the two sides of the perovskite sheet are polished to remove the damaged layer during cutting and...
Embodiment 2
[0042] The preparation of large-area perovskite flakes is as follows.
[0043] 1. Using the method of continuous growth, the fresh CH 3 NH 3 Br and PbBr 2 The mixed solution is continuously injected into the crystal growth container to maintain the crystal growth solution at a constant concentration to ensure the continuity and uniformity of the crystal growth process to obtain a CH with a size of 50mm×50mm×15mm. 3 NH 3 PbBr 3 Crystal, the luminescence peak of the substance is detected at 538nm;
[0044] 2. Using the sand wire cutting method, in which the speed of the sand wire movement is 3mm / s, the large-size perovskite crystal is cut to obtain an area of 500mm 2 , perovskite flakes with a thickness of 500 μm;
[0045] 3. Use ultrasonic cleaning to remove the mortar on the surface of the perovskite sheet;
[0046] 4. Using a mechanical polishing machine, the two sides of the perovskite sheet are polished to remove the damaged layer during cutting and increase the fl...
Embodiment 3
[0053] The preparation of large-area perovskite flakes is as follows.
[0054] 1. Using the method of continuous growth, the fresh CH 3 NH 3 Cl and PbCl 2 The mixed solution is continuously injected into the crystal growth container to maintain the crystal growth solution at a constant concentration to ensure the continuity and uniformity of the crystal growth process, so as to obtain a single crystal CH with a size of 20mm×20mm×10mm 3 NH 3 PbCl 3 , the detected luminescence peak of the substance is located at 402nm;
[0055] 2. Using the method of diamond wire cutting, in which the speed of diamond wire movement is 5mm / s, the large-size perovskite single crystal is cut to obtain an area of 400mm 2 , perovskite flakes with a thickness of 400 μm;
[0056] 3. Using a mechanical polishing machine, the two sides of the perovskite sheet are polished to remove the damaged layer during cutting and increase the flatness of the surface of the perovskite sheet to facilitate subs...
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