- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
One-step fabrication of 1D p-NiO nanowire/n-Si heterojunction: development of self-powered ultraviolet photodetector
摘要： Even though there are reports on NiO-p/Si-n based photodetector, work along 1D NiO/Si self-powered photodetector remains unexplored. 1D materials offer better electron mobility and can provide ballistic transport channel, which helps in achieving high responsivity. In this work, direct single-step deposition of p-type NiO nanowires on n-type Si as a self-powered photodetector was successfully fabricated by engaging simple electrospinning technique. The structural properties as observed from XRD indicate highly crystalline NiO nanowires and FESEM images revealed 60 ~75 nm diameter with uniform distribution. Growth of nanowires by using stimuli polymer and its completely removal at high temperature was confirmed using TGA and XPS analysis. The responsivity of the fabricated photodetector was calculated to be 9.1 mA W-1 at zero bias, which can be attributed to the p-type NiO interface with the n-type Silicon, which creates an internal electrical field thereby assisting in the effective separation of the photogenerated carriers. Further, under illumination, at zero bias, the photogenerated current still exists suggesting a generation of internal voltage, which makes the fabricated device as self-powered. This fabrication method will enhance the photodetection properties, and it can be implemented in the fields of optoelectronic devices, sensors, and flexible electronics.
关键词： Electrospinning,NiO nanowires,1D material,Self-powered photodetector
更新于2025-09-23 15:19:57
-
Self-powered infrared detection using a graphene oxide film
摘要： The interaction between water and graphene oxide (GO), including water adsorption and desorption, have been widely used to demonstrate moisture-electric energy transformation (MEET). By taking advantage of water desorption stimulated by infrared (IR) light from a graphene oxide film with a gradient of oxygen-containing groups (O-group), a self-powered IR detection approach that can convert IR light into electric signals is demonstrated. The temperature sensitivity reaches 4.2 mK. With further optimization of the materials and structures, the performance of such self-powered IR detection can be further improved. The mechanism of the detection involving IR/thermal effect on the interaction between vapor molecules and solid materials also has potential applications in thermal detection, thermal energy conversion, and chemical sensing.
关键词： thermal sensitivity,graphene oxide,moisture-electric energy transformation,self-powered,infrared detection
更新于2025-09-23 15:19:57
-
Polarization driven self-biased and enhanced UV - visible photodetector characteristics of ferroelectric thin film
摘要： In this work, a self-powered UV?visible photodetector characteristics of the polycrystalline BiFeO3 thin film exhibiting pronounced photo-response under both UV and visible light are demonstrated. Interestingly, the film displays switchable photodetector characteristics in accordance with the polarization switching properties and thereby confirms the role of polarization driven depolarization field on the observed properties. Importantly, the photodetector performance parameters such as responsivity (23.9 × 10?4 AW?1), detectivity (2.2 × 1010 Jones), photoconductive gain (8.5 × 10?3), and external quantum efficiency (5.3 %) observed under UV light are 2 to 4 order of magnitude higher than the values reported in similar oxide ferroelectric systems. These studies establish the application of polycrystalline BiFeO3 film as a self-powered UV ? visible photodetector.
关键词： BiFeO3,ferroelectrics,thin-film,UV ? visible photodetector,self-powered
更新于2025-09-23 15:19:57
-
In Situ Formed Gradient Bandgapa??Tunable Perovskite for Ultrahigha??Speed Color/Spectruma??Sensitive Photodetectors via Electrona??Donor Control
摘要： Integration of various photodetectors with different light-sensitive materials and detection capacity is an inevitable way to achieve entire color/spectrum detection. However, the uneven capacity of each photodetector would drag the overall performance behind, especially the response speed. A response time down to nanosecond level has not previously been reported for a filter-free color/spectrum-sensitive photodetector, as far as is known. Here, a self-powered filterless color-sensitive photodetection array based on an in situ formed gradient perovskite absorber film with continuously tunable bandgap is demonstrated. Ultrahigh-speed response at nanosecond level is achieved in all the ingredient photodetectors. The junction capacitance being influenced by carrier concentration in the absorber is identified to be responsible for the detection speed. Without any optic or mechanical supporting system, the designed color detector exhibits an external quantum efficiency (EQE) up to 94% and a high spectral resolution of around 80 nm for the whole visible spectrum. This work offers a guidance to achieve fast response of perovskite-based photodetectors from the point of view of carrier-donor control and demonstrates a new avenue to establish color-sensitive photodetectors/spectrometers.
关键词： photodetectors,self-powered devices,color-sensitive photodetection,spectrum analysis,perovskites
更新于2025-09-23 15:19:57
-
Enhanced Performances of p-Si/n-ZnO Self-powered Photodetector by Interface State Modification and Pyro-phototronic Effect
摘要： ZnO based self-powered photodetector (PD) has great application potential in distributing sensor networks and internet of things. However, a large number of surface or interface states within ZnO limit its performance improvement. Here, the surface and interface states of ZnO is greatly eliminated by ultraviolet irradiation as an interfacial modification engineering. Reduction of interface states reduces ohmic resistance, also enhances the tuning role of pyro-phototronic effect. And the transient response currents of the self-powered PD are thus significantly improved with a maximal enhancement factor of more than 5900% for the 325-785 nm broadband stimulating beams. The corresponding response time is decreased to few milliseconds or sub-milliseconds. The results indicate that surface-state reduction of ZnO can effectively enhance the modifying role of pyro-phototronic effect and greatly improve the response performances of the self-powered broadband PDs with great application demands in Internet of things, broad spectral detecting and imaging, and smart optoelectronic devices.
关键词： Self-powered,ultraviolet irradiation,interface states,pyro-phototronic effect,broadband photodetectors
更新于2025-09-23 15:19:57
-
Self-powered ultra-broadband and flexible photodetectors based on the bismuth films by vapor deposition
摘要： Bismuth (Bi), as a topological semi-metallic material, has received widespread attention on account of its fascinating properties. Here, Bi films were successfully grown through a direct and facile vapor deposition method on 300 nm SiO2/Si (SiO2) and polyimide (PI) substrates. The Bi films were utilized further to fabricate rigid and flexible photodetectors. The rigid photodetector based on Bi/SiO2 show fast, highly stable, self-powered, and ultra-broadband photoresponses. The flexible Bi/PI photodetector exhibits durability and reproducibility in photoresponse behaviors under bending with various curvature radius and after hundreds of bending cycles. Our results demonstrated that the Bi films by vapor deposition have great application potentials in next generation of optoelectronic devices.
关键词： flexible,vapor deposition,ultra-broadband,self-powered,photodetector,Bi films
更新于2025-09-23 15:19:57
-
Self-Powered Solar-Blind Photodetectors Based on <i>?±</i> / <i>?2</i> Phase Junction of
摘要： Self-powered Ga2O3-based solar-blind photodetectors have received attention recently due to the increased demand for energy saving, miniaturization, and high efficiency in devices. An ideal device structure consisting of a Ga2O3-based p-n junction is still difficult to obtain, since p-type doping is a major challenge. Although self-powered devices based on heterojunction are promising, there are two fatal disadvantages: (1) photosensitivity of the non-solar-blind region, on account of the narrower band gap of the heterojunction materials; and (2) poor quality of the epitaxial film due to lattice mismatch. In view of the various polymorphs of Ga2O3, we propose constructing a structure consisting of a Ga2O3 phase junction with α and β phases (α/β phase junction) for self-powered solar-blind photodetectors. The small lattice mismatch and similar band gap between α- and β-Ga2O3 will solve the two problems outlined above. The formation of α- and β-Ga2O3 is expected to result in a type-II band alignment, promoting separation of photogenerated carriers, which transfer through the junction to the corresponding electrodes. Herein, the α/β phase junction of Ga2O3 vertically aligned nanorod arrays with a thickness-controllable β-Ga2O3 shell layer are fabricated by a low-cost and simple process of hydrothermal and postannealing treatment. Two different types of self-powered α/β-Ga2O3 phase junction-based photodetectors, in the form of solid-state type and photoelectrochemical type, are constructed and realized. Our analysis shows that the constructed photodetectors are capable of highly efficient detection of solar-blind signal without any bias voltage. This work demonstrates the usefulness of using the α/β-Ga2O3 phase junction in a self-powered solar-blind photodetector, which is not only energy efficient, but also potentially workable in outer space, at the south and north pole, and other harsh environments without external power for a long time.
关键词： solar-blind photodetectors,phase junction,Ga2O3,α/β phase junction,self-powered
更新于2025-09-23 15:19:57
-
Perovskite Transparent Conducting Oxide for the Design of Transparent, Flexible and Self-Powered Perovskite Photodetector
摘要： Transparent and flexible electronic devices are highly desired to meet the great demand for next-generation devices with lightweight, flexible and portable. Transparent conducting oxides (TCOs), such as indium-tin oxide (ITO), serve as fundamental components for the design of transparent and flexible electronic devices. However, indium is rare and expensive. Herein, we report the fabrication of low-cost perovskite SrVO3 TCO films on transparent and flexible mica substrates, and further demonstrate its utilization as a TCO electrode for building a transparent, flexible and self-powered perovskite photodetector. Superior stable optical transparency and electrical conductivity retain in SrVO3 after bending up to 105 cycles. Without an external power source, the constructed all-perovskite photodetector exhibits a high responsivity (42.5 mA W-1), fast response time (3.09/1.23 ms), as well as an excellent flexibility and bending stability after dozens of cycles of bending at the extremely 90 bending angle. Our results demonstrate that low-cost and structural compatible transition metal-based perovskite oxides, like SrVO3, as TCO electrodes have huge potential for building high-performance transparent, flexible and portable smart electronics.
关键词： Transparent conducting oxides,flexible,SrVO3,perovskite,self-powered photodetector
更新于2025-09-23 15:19:57
-
High Sensitivity and Fast Response Self-Powered Solar-Blind Ultraviolet Photodetector with ?2-Ga2O3/Spiro-MeOTAD p-n Heterojunction
摘要： Solar-blind ultraviolet (UV) photodetectors are greatly desired in number of areas in terms of the military and civilian purposes, especially self-powered devices driven by the photovoltaic effect. Herein, a solar blind photodetector has been successfully achieved on a Spiro-MeOTAD/β-Ga2O3 organic-inorganic hybrid construction. The fabricated photodetector can operate with self-powered mode and show an obvious photodetection with a narrow spectrum region, exhibiting a high responsivity (65 mA/W) and a large external quantum efficiency (32％) under low power intensity (~1 μW/cm2) UV illumination, at zero bias. Fortunately, the device shows a fast temporal pulse response (τrise~2.98 μs and τdecay~28.49 μs), which is superior to the previously reported Ga2O3 based self-powered photodetectors. More importantly, the photodetector can operate stably and shows good repeatability. These excellent performances of device could be attributed to the pre-existing band alignment of the Ga2O3 and Spiro-MeOTAD, and are comparable to and/or even higher than those of other self-powered solar-blind UV photodetectors, which indicate that the design of device configuration based on a Ga2O3/Spiro-MeOTAD heterojunction is certified as an excellent candidate for high sensitivity, ultrafast response and self-powered photo-detecting device for solar-blind UV signal.
关键词： β-Ga2O3,Spiro-MeOTAD,photodetector,Solar-blind ultraviolet,self-powered,heterojunction
更新于2025-09-23 15:19:57
-
Flexible and Selfa??Powered Lateral Photodetector Based on Inorganic Perovskite CsPbI <sub/>3</sub> a??CsPbBr <sub/>3</sub> Heterojunction Nanowire Array
摘要： Self-powered perovskite photodetectors mainly adopt the vertical heterojunction structure composed of active layer, electron–hole transfer layers, and electrodes, which results in the loss of incident light and interfacial accumulation of defects. To address these issues, a self-powered lateral photodetector based on CsPbI3–CsPbBr3 heterojunction nanowire arrays is designed on both a rigid glass and a flexible polyethylene naphthalate substrate using an in situ conversion and mask-assisted electrode fabrication method. Through adding the polyvinyl pyrrolidone and optimizing the concentration of precursors under the pressure-assisted moulding process, both the crystallinity and stability of perovskite nanowire array are improved. The nanowire array–based lateral device shows a high responsivity of 125 mA W?1 and a fast rise and decay time of 0.7 and 0.8 ms under a self-powered operation condition. This work provides a new strategy to fabricate perovskite heterojunction nanoarrays towards self-powered photodetection.
关键词： perovskites,photodetectors,flexible devices,self-powered
更新于2025-09-23 15:19:57