Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, People's Republic of China.
Nanotechnology. 2017 Nov 24;28(47):475705. doi: 10.1088/1361-6528/aa8f8d.
Photocarrier dynamics in tungsten disulfide-black phosphorus (BP) heterostructures were studied by time-resolved differential reflection measurements. The heterostructures were fabricated by stacking together monolayer WS and BP flakes that are both fabricated by mechanical exfoliation. Efficient and ultrafast transfer of photocarriers from WS to BP flakes was observed. This confirms the type-I band alignment of WS/BP heterostructures that was predicted by theory. Accompanied with the photocarrier interlayer transfer process from WS to BP flakes, the change of the absorption of WS persists for several nanoseconds. These results promote the consciousness about the carrier dynamics of interlayer transfer process in van der Waals heterostructures and its application in optoelectronic devices.
通过时间分辨差示反射测量研究了二硫化钨-黑磷（BP）异质结构中的光载流子动力学。异质结构是通过将单层 WS 和 BP 薄片堆叠在一起制成的，这些薄片都是通过机械剥落法制备的。观察到光载流子从 WS 到 BP 薄片的高效和超快转移。这证实了理论预测的 WS/BP 异质结构的 I 型能带排列。伴随着光载流子从 WS 到 BP 薄片的层间转移过程，WS 的吸收变化持续了几个纳秒。这些结果提高了对范德华异质结构中层间转移过程的载流子动力学及其在光电器件中的应用的认识。
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