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Strong Cathodoluminescence and Fast Photoresponse from Embedded CH3NH3PbBr3 Nanoparticles Exhibiting High Ambient-Stability
摘要： This study presents a comprehensive analysis of the strong cathodoluminescence (CL), photoluminescence (PL), and photoresponse characteristics of CH3NH3PbBr3 nanoparticles (NPs) embedded in a mesoporous nanowire template. Our study revealed a direct correlation between the CL and PL emissions from the perovskite NPs (Per NPs), for the first time. Per NPs are fabricated by a simple spin coating of perovskite precursor on the surface of metal-assisted-chemically-etched mesoporous Si NWs array. The Per NPs confined in the mesopores show blue shifted and enhanced CL emission as compared to the bare perovskite film, while the PL intensity of Per NPs dramatically high compared to its bulk counterpart. A systematic analysis of the CL/PL spectra reveals that the quantum confinement effect and ultra-low defects in Per NPs are mainly responsible for the enhanced CL and PL emissions. Low-temperature PL and time-resolved PL analysis confirm the high exciton binding energy and radiative recombination in Per NPs. The room temperature PL quantum yield of the Per NPs film on the NW template was found to be 40.5 %, while that of Per film was 2.8%. The Per NPs show improved ambient air-stability than the bare film due to the protection provided by the dense NW array, since dense NW array can slow down the lateral diffusion of oxygen and water molecules in Per NPs. Interestingly, the Si NW/Per NPs junction shows superior visible light photodetection and the prototype photodetector shows a high responsivity (0.223 A/W) with a response speed of 0.32 sec and 0.28 sec of growth and decay in photocurrent, respectively, at 2V applied bias, which is significantly better than the reported photodetectors based on CH3NH3PbBr3 nanostructures. This work demonstrates a low-cost fabrication of CH3NH3PbBr3 NPs on a novel porous NW template, which shows excellent photophysical and optoelectronic properties with superior ambient stability.
关键词： Perovskite Nanoparticles,PL QY enhancement,Porous Si Nanowires,Fast Photoresponse,CL Enhancement
更新于2025-11-21 11:01:37
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Plasmonic hole-transport-layer enabled self-powered hybrid perovskite photodetector using a modified perovskite deposition method in ambient air
摘要： Herein, we report on an air-processed high performance self-powered hybrid perovskite (Pe) photodetector with plasmonic Silver nanoparticle (Ag NP) embedded hole-transport-layer (HTL), without the use of any electron-transporting layer (ETL). It is demonstrated that in the absence of ETL in the device, the Ag NPs embedded PEDOT:PSS HTL improves the photodetection performance significantly. We used a novel N2 gas assisted fast crystallization method for the deposition of perovskite film in ambient condition to form uniform Pe layer as compared to the nonuniform film obtained in conventional deposition method. The Pe film on Ag NPs embedded PEDOT:PSS layer shows enhanced optical absorption in the UV-visible region due to the plasmonic absorption by the Ag NPs. At zero bias, the ETL-free Ag NPs-Pe hybrid device shows ~45% enhanced responsivity and ~3 times faster photoresponse compared to the pristine device. The enhancements in the performance of hybrid photodetector are attributed to plasmon-enhanced optical absorption and hot electron generation, as well as improvement in charge extraction and transport by Ag NPs, which are corroborated by steady-state and time-resolved photoluminescence measurements. Impedance analysis of the devices shows the reduced carrier transfer resistance of the hybrid device, which results in superior transport of photo-generated charge carriers. Direct evidence for the increase in the work function by ~ 47 meV for Ag NPs doped PEDOT:PSS film is provided from the Kelvin probe force microscopy analysis. This increase in work function enables favorable band alignment with reduced energy barrier and a superior carrier transport resulting in improved photodetection performance for the hybrid device. Our results are significant for the development of high-performance, low-cost, ETL free plasmonic perovskite photodetectors for futuristic applications.
关键词： Plasmonic perovskite photodetector,Kelvin probe force microscopy,Fast photoresponse,Self-biased photodetector
更新于2025-11-21 11:01:37
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High-performance flexible UV photodetectors based on AZO/ZnO/PVK/PEDOT:PSS heterostructures integrated on human hair
摘要： Flexible optoelectronics is an emerging research field that has attracted profound interest in recent years due to the special functions and potential applications of these devices in flexible image sensors, optical computing, energy conversion devices, Internet of Things and other technologies. Here, we demonstrate the high-performance UV photodetectors using AZO/ZnO nanorods/PVK/PEDOT:PSS heterostructures integrated on human hair. Due to the precise interfacial energy-level alignment among all layers and superior mechanical characteristics of human hair, the as-obtained photodetector shows a fast response time, high photoresponsivity and excellent flexibility. According to integrate 7 heterostructures as 7 display pixels, the flexible UV-image sensor has superior device performance and outstanding flexibility and can produce vivid and accurate images of Arabic numerals from 0 to 9. Different combinations of the two heterostructures can also be used to achieve flexible photon-triggered logic functions including AND, OR and NAND gates. The findings in this work indicate the possibility of using the human hair as fibre-shaped flexible substrate and will allow the use of hair-based hierarchical heterostructures as building blocks to create exciting opportunities for next generation high-performance, multifunctional, low-cost, and flexible optoelectronic devices.
关键词： photon-triggered logic gates,fast photoresponse,UV photodetectors,human hair,optical-image sensors
更新于2025-11-14 17:04:02
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A Lattice-mismatched PbTe/ZnTe Heterostructure with High-speed Mid-infrared Photoresponses
摘要： In this work, a novel heterostructure consisting of di?erent lattice structures with zincblende ZnTe and rock-salt PbTe is proposed. The PbTe/ZnTe heterostructures are grown by molecular beam epitaxy. Type-I band alignment at the PbTe/ZnTe heterointerface is revealed by X-ray photoelectron spectroscopy. The interface of the heterostructure exhibits exotic electrical properties. The novel heterostructure is then implemented to develop high-performance mid-infrared photodetectors which demonstrate pronounced responsivity, swift response speed and high detectivity. The new photodetectors utilize the lateral photovoltaic e?ect which facilitates the understanding of the novel PbTe/ZnTe heterostructures.
关键词： mid-infrared detectors,fast photoresponse,lead telluride,lateral photovoltaic e?ect,semiconductor heterostructures
更新于2025-09-12 10:27:22