- 标题
- 摘要
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- 实验方案
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ZIF-8@H:ZnO Core-shell nanorods arrays/Si heterojunction self-powered photodetector with ultrahigh performance
摘要： The native defects will degrade the performance and stability of the optoelectric device. Herein, a zeolitic imidazolate framework-8 (ZIF-8)@H:ZnO core-shell nanorods arrays/Si heterojunction self-powered photodetector is demonstrated. Combining hydrogenation and ZIF-8 passivation, its photoresponsive characteristics are greatly enhanced. The photodetector exhibits superior detectivity of ~2.14×1016 Jones (1 Jones=1 cm Hz1/2 W-1), high responsivity of ~7.07×104 mA W-1, prominent sensitivity of ~2.08×1012 cm2 W-1 and broadband photodetection ranging from the ultraviolet to the near infrared. As critical figures of merit, its responsivity increases by nearly 5 orders of magnitude than that of pristine ZnO nanorods arrays/Si heterojunction photodetector. More importantly, the comprehensive performance of ZIF-8@H:ZnO core-shell nanorods arrays/Si heterojunction photodetector not only achieves a record high value for ZnO-based photodetectors reported so far, but also can be comparable with that of two-dimensional (2D) materials, zero-dimensional (0D) materials, topological insulators, perovskites and other oxides based self-powered photodetectors. The novel post-treatment strategy has great potential in developing high-performing self-powered photodetectors. Meanwhile, this work may be extended to other oxides based optoelectronic devices.
关键词： core-shell nanorods,heterojunction,passivation,self-powered photodetector,ZnO,ZIF-8,hydrogenation
更新于2025-11-14 17:04:02
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ZnO@ZIF-8 inverse opal structure photoanode for efficient CdS/CdSe co-sensitized quantum dot solar cells
摘要： Photoanodes in quantum-dot-sensitized solar cells are essential to the process of light collection and charge transfer. In this paper, three-dimensional inverse opal (ZnO@ZIF-8 3D IO) photoanode is fabricated via a self-assembled opal template method. The synthesized photoanode has completely connected pores with extended diameter, thus promoting the permeability of QDs and electrolyte. Meanwhile, the light trapping ability and charge transfer process can be enhanced due to the slow photon and multi-scattering effect of the regularly interconnected macroporous array structure. ZIF-8 shell coated on the surface of ZnO IO not only provides high porosity but also serves as a protective passivation layer to reduce the carriers recombination occurred at the interfacial. In order to investigate the charge transport mechanism of ZnO @ ZIF-8 IO, cascaded CdS/CdSe quantum dots were used as sensitizers. Benefiting from the IO structure and ZIF-8 modification, the photoelectric conversion efficiency of solar cells based on ZnO@ZIF-8 IO can reach 1.75% (1.71 ± 0.04%), almost twice of that of the solar cells based on ZnO IO photoanode (0.81 ± 0.05%).
关键词： inverse opal structure,CdS/CdSe co-sensitized,ZnO@ZIF-8,photoanode,quantum dot solar cells
更新于2025-09-19 17:13:59