光电探测器
异质结
材料科学
光电子学
响应度
薄膜
蓝宝石
光学
钙钛矿(结构)
激光器
纳米技术
物理
工程类
化学工程
作者
Longxing Su,Tingfen Li,Yuan Zhu
出处
期刊:Optics Express
[The Optical Society]
日期:2022-06-10
卷期号:30 (13): 23330-23330
被引量:14
摘要
In this work, we have reported a vertical CsPbBr 3 /ZnO heterojunction photodetector for photo-sensing lights from UV to visible band. The ZnO thin film is deposited on the c-sapphire substrate through a molecular beam epitaxy (MBE) technique, and then the CsPbBr 3 thin film is synthesized on the as-prepared ZnO film layer by using a solution processing method. The as-prepared CsPbBr 3 /ZnO heterostructure presents type-II energy band structure induced by the energy band offset effect, which can promote the separation and extraction efficiencies of the photo-generated electron-hole pairs. Compared with the CsPbBr 3 based metal-semiconductor-metal (MSM) structure photodetector, the heterojunction photodetector presents higher responsivity and detectivity of 630 µA/W and 7 × 10 9 Jones. While compared with the ZnO based MSM structure photodetector, the heterojunction device reveals much faster response speeds of 61 µs (rise time) and 1.4 ms (decay time). These findings demonstrate that the CsPbBr 3 /ZnO heterojunction photodetector is promising for constructing next generation perovskite based optoelectronic devices.
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