Embedding PbS quantum dots in MAPbCl0.5Br2.5 perovskite single crystal for near-infrared detection |
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| Authors: | Shilin Liu Shikai Yan Zhuoya Zhu Zhiwei Zhao Elias Emeka Elemike Damian C Onwudiwe Byung Seong Bae Suhaidi Bin Shafie Wei Lei Qing Li |
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| Affiliation: | 1. Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing, China;2. Department of Chemistry, Faculty of Natural and Agricultural Sciences, North-West University, Mafikeng Campus, Mmabatho, South Africa;3. Department of Electronics & Display Engineering, Hoseo University, Asan City, South Korea;4. Institute of Advanced Technology, Universiti Putra Malaysia, Serdang, Malaysia |
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| Abstract: | Organometal lead-halide perovskites demonstrate excellent photovoltaic performance in the visible (Vis) region. However, their lack of response in the near-infrared (NIR) region limits their applications in broadband photodetectors. Here, PbS quantum dots (QDs) were successfully embedded in MAPbCl0.5Br2.5 single crystal by solution-processed epitaxial growth. Perovskites can effectively act as efficient charge transporters. The mobility of MAPbCl0.5Br2.5 with 1 wt% PbS quantum dots crystal is about 85 cm2/(V·S), which is similar to that of pure MAPbCl0.5Br2.5 single crystal. Meanwhile, the composite crystal exhibited a broadband response wavelength from the Vis (625 nm) to the NIR (850 nm) with fast response times (τon/τoff = 6/9 ms and τon/τoff = 19/43 ms in the Vis and NIR regions, respectively). The photodetector demonstrates a responsivity of 0.02 mA/W with a specific detectivity of 1.2 × 108 Jones under 5.1 mW/cm2 850-nm illumination at 10-V bias. These results suggest that we have obtained high-quality composite crystals with improved photo response in the Vis to NIR region. |
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| Keywords: | epitaxial growth near-infrared region PbS QDs perovskites single crystal |
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