- 标题
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Self-Powered Broad-band Photodetectors Based on Vertically Stacked WSe <sub/>2</sub> /Bi <sub/>2</sub> Te <sub/>3</sub><i>p–n</i> Heterojunctions
摘要： Semiconducting p-n heterojunctions, serving as the basic unit of modern electronic devices, such as photodetectors, solar-energy conversion devices, and light-emitting diodes (LEDs), have been extensively investigated in recent years. In this work, high performance self-powered broadband photodetectors were fabricated based on vertically stacked p-n heterojunctions though combining p-type WSe2 with n-type Bi2Te3 via van der Waals (vdW) epitaxial growth. Devices based on the p-n heterojunction show obvious current rectification behaviors in the dark and superior photovoltaic characteristics under light irradiation. Maximum short circuit current of 18 nA and open circuit voltage of 0.25 V can be achieved with the illumination light of 633 nm (power density: 26.4 mW/cm2), which are among the highest values compared with the ever reported 2D vdW heterojunctions synthesized by CVD method. Benefiting from the broadband absorption of the heterostructures, the detection range can be expanded from visible to near-infrared (375-1550 nm). Moreover, ascribing to the efficient carriers separation process at the junction interfaces, the devices can be further employed as self-powered photodetectors, where fast response time (≈210 μs) and high responsivity (20.5 A/W at 633 nm and 27 mA/W at 1550 nm) are obtained under zero bias voltage. The WSe2/Bi2Te3 p-n heterojunction-based self-powered photodetectors with high photoresponsivity, fast photoresponse time and broad spectral response will find potential applications in high speed and self-sufficient broadband devices.
关键词： p-n heterojunction,photodetector,photovoltaic,charge transfer,broadband,self-powered
更新于2025-09-12 10:27:22
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UV-blue photodetectors based on n-SnOx/p-diamond
摘要： High-performance self-powered UV-blue photodetector was fabricated based on n-SnOx/p-diamond heterojunction. The SnOx film was deposited on the high temperature and high pressure synthetic boron doped diamond wafer by RF magnetron sputtering. This heterojunction device exhibits a good rectification behavior with a rectification ratio of 3.15×104 at ± 3 V. At zero bias, the device responds in the wavelength ranging from 250nm to 500nm with a peak response at 350nm. The photoresponse rise time and decay time of the device are both less than 2 s under UV-blue illumination with different wavelengths. These results demonstrate that the n-SnOx/p-diamond heterojunction device has potential applications in the field of UV-blue detection.
关键词： Photodetector,RF sputtering,Self-powered,Thin films,Heterojunction,XPS
更新于2025-09-12 10:27:22
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Self‐Powered UV–Vis–NIR Photodetector Based on Conjugated‐Polymer/CsPbBr <sub/>3</sub> Nanowire Array
摘要： Perovskite photodetectors have attracted intensive research interest due to promising applications in sensing, communication, and imaging. However, their performance is restricted by the narrow spectrum range, required power source, and instability in ambient environment. To address these issues, a self-powered photodetector based on the inorganic CsPbBr3 perovskite nanowire array/conjugated-polymer hybrid structure is designed. The spectra response range of the device can be extended to 950 nm, along with outstanding stability, fast response speed (111/306 μs), and large detectivity (1.2 × 1013 Jones). The performance parameters are comparable to or even better than most reported CsPbBr3 and conjugated-polymer photodetectors. The excellent performance is mainly attributed to the efficient carrier generation, separation, and transport resulting from array structure and favorable band structure.
关键词： CsPbBr3,photodetector,perovskite,diffraction grating,self-powered
更新于2025-09-11 14:15:04
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Self‐Powered Photodetectors Based on 2D Materials
摘要： Self-powered photodetectors are considered as a new type of photodetectors enabling self-powered photodetection without external power. The excellent photoresponsivity, fast photoresponse rate, low dark current, and large light on/off ratio of these photodetectors have attracted wide interest among scholars. 2D materials are widely used in self-powered photodetectors due to their excellent optical and electrical properties, unique 2D structures, and their capabilities to exhibit excellent photodetection performance. According to the self-driving mechanism of 2D material-based self-powered photodetectors, they are divided into three categories: p–n junction photodetectors, Schottky junction photodetectors, and photoelectrochemical photodetectors. From these three perspectives, the research progress of 2D material-based self-powered photodetectors is summarized in detail here. Research reports indicate that 2D material-based self-powered photodetectors have excellent self-powered photoresponse behavior, good light on/off characteristics, and wideband spectral response ranges. The excellent photoresponse performance of 2D material-based self-powered photodetectors facilitates their potential applications in the field of optoelectronic devices. In particular, self-powered photodetectors have great potential as novel emerging self-driven optoelectronic devices. Finally, directions for the further development of 2D material-based self-powered photodetectors are anticipated.
关键词： self-powered devices,photodetectors,2D materials
更新于2025-09-11 14:15:04
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Cross‐Bar SnO <sub/>2</sub> ‐NiO Nanofiber‐Array‐Based Transparent Photodetectors with High Detectivity
摘要： An cross-bar structure is employed to design a transparent p-n junction-based photodetector. The device consisting of aligned n-SnO2 and p-NiO nanofibers is prepared via a mature electrospinning process that is suitable for commercial applications. It exhibits a high detectivity of 2.33 × 1013 Jones under 250 nm illumination at ?5 V, outperforming most state-of-art SnO2-based UV photodetectors. It is also endowed with a self-powered feature due to a photovoltaic effect from the p-n junction, resulting in a photocurrent of 10?10 A, responsivity of 30.29 mA W?1 at 0 V bias, and detectivity of 2.24 × 1011 Jones at 0.05 V bias. Moreover, the device is highly transparent (over 90% toward visible light) due to the wide band gap of photoactive materials and well-designed cross-bar fiber structure. Additionally, an n-SnO2-p-ZnO:Ag (Ag doped ZnO) self-powered UV photodetector is fabricated that shows good performance and give another example of the use of the cross-bar structure.
关键词： p-n junctions,self-powered photodetectors,transparent electronics
更新于2025-09-11 14:15:04
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Dual-Polarity Response in Self-Powered ZnO NWs/Sb2Se3 Film Heterojunction Photodetector Array for Optical Communication
摘要： Self-powered photodetectors (PD) have great potential applications in visible light communication (VLC) systems due to their unique advantages such as energy saving and low cost, where color shift keying (CSK) is widely utilized to meet the requirements of non-negative light intensity modulation. However, at least two PDs with filters are needed to decode the optical signals, greatly increasing the device cost and complicating the communication system. Here, we report a new type of dual-polarity response PD with an adjustable polarity switching wavelength, where the output signals are positive and negative in long and short wavelength regions, respectively. The dual-polarity response is a consequence of the competition between photovoltaic (PV) effect of ZnO NWs/Sb2Se3 film p-n junction and pohtothermoelectric (PTE) effect of Sb2Se3 thin film. As compared with current PDs in CSK systems, our PD can work without any filter and one PD can realize the function of two traditional PDs. This new PDs have the potential applications in optical communication systems and filterless color discrimination.
关键词： Photodetector,ZnO,self-powered,Sb2Se3,dual-polarity
更新于2025-09-11 14:15:04
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Recent developments in flexible photodetectors based on metal halide perovskite
摘要： Flexible photodetectors (FPDs) have been receiving increasing attention in recent years because of their potential applications in electronic eyes, bioinspired sensing, smart textiles, and wearable devices. Moreover, metal halide perovskites (MHPs) with outstanding optical and electrical properties, good mechanical flexibility, low-cost and low-temperature solution-processed fabrication have become promising candidates as light harvesting materials in FPDs. Herein, we comprehensively review the developments of FPDs based on MHPs reported recently. This review firstly provides an introduction with respect to the performance parameters and device configurations of perovskite photodetectors, followed by the specific requirements of FPDs including substrate and electrode materials. Next, chemical compositions, structures and preparation methods of MHPs are presented. Then, the FPDs on the basis of single-component perovskite and hybrid structure perovskite are discussed, subsequently, self-powered flexible perovskite photodetectors were presented. In the end, conclusions and challenges are put forward in the field of FPDs based on perovskites.
关键词： metal halide perovskites,flexible photodetectors,self-powered
更新于2025-09-11 14:15:04
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Photoelectrochemical Self-Powered Solar-Blind Photodetectors Based on Ga2O3 Nanorod Array/Electrolyte Solid/Liquid Heterojunctions with a Large Seperation Interface of Photogenerated Carriers
摘要： Solar-blind photodetectors have been widely developed because of their great potential application in biological analysis, ultraviolet communication, and so on. Photodetectors constructed by vertically aligned nanorod arrays (NRAs), have attracted intensive interest recently owing to the virtues of low light reflectivity and rapid electron transport. However, limited by the insufficient contact between the upper electrode and NRAs because of uneven NRAs, photo-generated carriers cannot be effectively separated and transferred. In this work, a novel photoelectrochemical (PEC) type self-powered solar-blind photodetectors constructed in the form of Ga2O3 NRAs/electrolyte solid/liquid heterojunction with a large photogenerated carrier separation interface has been fabricated, β-Ga2O3 NRAs PEC photodetector shows a photoresponsivity of 3.81 mA/W at a bias voltage of 0 V under the 254 nm light illumination with the light intensity of 2.8 mW/cm2, thus yielding a Iphoto/Idark ratio of 28.97 and an external quantum efficiency of 1.86 %. Our results provide a novel device structure of solar-blind photodetector with high efficient deep-ultraviolet photodetection and low power consumption.
关键词： photoelectrochemical,Ga2O3 NRAs,solid-liquid heterojunction,solar-blind photodetectors,self-powered
更新于2025-09-11 14:15:04
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High-bandwidth InGaN self-powered detector arrays toward MIMO visible light communication based on micro-LED arrays
摘要： This work reports the use of the chip-based GaN-based micro-LED (μLED) arrays for multifunctional applications as micro-display, data transmitters, photodetectors and solar cells. The functions of display and transmitter have been reported, and particularly we experimentally demonstrated that μLED arrays could be used as self-powered, high-performance and wavelength-selective photodetectors (PDs) enabling high-speed multiple-input multiple-output (MIMO) visible light communications (VLC) under on-off keying (OOK) modulation scheme using 405 nm violet laser diodes (LDs) as transmitters. The optoelectronic and communication characteristics of the μLED-based PDs with diameters of 40 μm, 60 μm and 100 μm were systematically studied. The optoelectronic analysis shows superior performances of μLED-based PDs at 405 nm wavelength compared with other previously reported GaN-based PDs. Under a bias voltage of -5 V, the comparable peak responsivities of 0.27, 0.31 and 0.24 A/W, specific detectivities of 1.1 × 1011, 2.3 × 1012 and 2.1 × 1012 cm ? H1/2 ? W-1, and linear dynamic ranges (LDRs) of 152, 162 and 164 dB were achieved for 40-μm, 60-μm and 100-μm μLEDs, respectively. Even at zero-bias, i.e. self-powered mode, we have achieved high peak responsivities of 0.24, 0.29 and 0.21 A/W, high specific detectivities of 7.5 × 1012, 1.5 × 1013 and 1.3 × 1013 cm?H1/2?W-1 and high LDR up to 186, 196 and 197 dB for 40-μm, 60-μm and 100-μm μLEDs, respectively. The μLEDs could also be used to harvest the optical energy of the system, working as solar cells. The μLED-based PD arrays were tested as receivers in VLC system to implement high-speed parallel communication, which yields maximum data rates of 180 Mbps, 175 Mbps and 185 Mbps for a single 40-μm, 60-μm and 100-μm μLED-based PDs at a distance of 1 m with BERs of 3.5 × 10-3, 3.7 × 10-3 and 3.5 × 10-3, respectively. Furthermore, 2 × 2 MIMO parallel VLC system was achieved to increase the VLC data rate, which suggests the potential of using large μLED-based PD arrays for multiple Gbps and even Tbps VLC applications.
关键词： photodetector array,visible light communication,Micro-LED (μLED),multiple-input and multi-output (MIMO),self-powered
更新于2025-09-11 14:15:04
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CdS quantum dots/Au nanoparticles/ZnO nanowire array for self-powered photoelectrochemical detection of Escherichia coli O157:H7
摘要： In this paper, the hydrothermally grown ZnO nanowire array (NWs) was modified by Au nanoparticles (NPs) and CdS quantum dots (QDs) to construct a high-performance photoelectrochemical (PEC) electrode. The aligned ZnO NWs, which decorated Au NPs and CdS QDs have the effective light absorption range from UV to visible region. This hybrid structure provided a self-powered PEC electrode with a favorable energy-band configuration for fast charge separation and transportation. Meanwhile, the Au NPs and CdS QDs also made increase of the surface area to improve the immobilization of the analytes. After assembling aptamer as recognition element, this composite nanoarray was further developed as a self-powered PEC biosensor by synergizing above multiple enhancement factors. The PEC aptasensor exhibited a rapid response in a wide linear range of 10-107 CFU/mL with the detection limit as low as 1.125 CFU/mL to Escherichia coli O157:H7 (E. coli O157:H7). This approach would offer an alternative PEC transduction for fast environment monitoring and clinical diagnosis related to pathogenic bacteria.
关键词： E. coli O157:H7,self-powered,photoelectrochemical,aptasensor
更新于2025-09-11 14:15:04