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All-Perovskite Photodetector with Fast Response
摘要： Perovskites have attracted substantial attention on account of their excellent physical properties and simple preparation process. Here we demonstrated an improved photodetector based on solution-processing organic-inorganic hybrid perovskite CH3NH3PbI3?xClx layer decorated with CsPbBr3 perovskite quantum dots. The CH3NH3PbI3?xClx-CsPbBr3 photodetector was operated in a visible light region, which appeared high responsivity (R = 0.39 A/W), detectivity (D* = 5.43 × 109 Jones), carrier mobility (μp = 172 cm2 V?1 s?1 and μn = 216 cm2 V?1 s?1), and fast response (rise time 121 μs and fall time 107 μs). The CH3NH3PbI3?xClx-CsPbBr3 heterostructure is anticipated to find comprehensive applications in future high-performance photoelectronic devices.
关键词： Perovskite,Fast response,CsPbBr3 quantum dots,Photodetector
更新于2025-09-19 17:13:59
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Fast Response Solar-Blind Photodetector with a Quasi-Zener Tunneling Effect Based on Amorphous In-Doped Ga2O3 Thin Films
摘要： A high-performance solar-blind photodetector with a metal–semiconductor–metal structure was fabricated based on amorphous In-doped Ga2O3 thin films prepared at room temperature by radio frequency magnetron sputtering. The photodetector shows a high responsivity (18.06 A/W) at 235 nm with a fast rise time (4.9 μs) and a rapid decay time (230 μs). The detection range was broadened compared with an individual Ga2O3 photodetector because of In doping. In addition, the uneven In distribution at different areas in the film results in different resistances, which causes a quasi-Zener tunneling internal gain mechanism. The quasi-Zener tunneling internal gain mechanism has a positive impact on the fast response speed and high responsivity.
关键词： quasi-Zener tunneling effect,fast response,amorphous InGaO thin films,solar-blind photodetector
更新于2025-09-16 10:30:52
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Edge-contact large area hetero-structure fast photodetector utilizing two-dimensional r-GO on three-dimensional GaN material interface
摘要： Here we report a contact geometry for directly accessing the hetero-structured interface formed at the junction of a two-dimensional and three-dimensional material. This type of edge contact proves to be very efficient to improve the performance of photosensitive devices intrinsically having slow response and persistent photoconductivity under biased conditions. The device demonstrates fast photoresponse speeds of <40 ms range under ?5 V and +5 V.
关键词： Fast Response,Contact,Heterojunction,2D materials,Photodetector
更新于2025-09-12 10:27:22
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Highly Sensitive, Fast Response Perovskite Photodetectors Demonstrated in Weak Light Detection Circuit and Visible Light Communication System
摘要： Organic–inorganic hybrid perovskite (OIHP) photodetectors have presented unprecedented device performance mainly owing to outstanding material properties. However, the solution-processed OIHP polycrystalline thin films with defective surface and grain boundaries always impair the key parameter of photodetectors. Herein, a nonfullerene passivation layer exhibits more efficient passivation for OIHP materials to dramatically reduce the trap density of state, yielding a dark current as low as 2.6 × 10?8 A cm ?2 under ?0.1 V. In addition, the strong absorption in near-infrared (NIR) region of nonfullerene/C60 heterojunction broadens the detectable range to over 900 nm by effective charge transport, ultimately leading to a specific detectivity of 1.45 × 1012 and 7.37 × 1011 cm Hz1/2 W?1 at 650 and 820 nm, respectively. Encouragingly, the response speed of 27 ns is obtained at 0.6 mm2 of device area by removing constrain from the resistance–capacitance constant. Moreover, the prominent practical application of the photodetector is demonstrated in a weak light detection circuit and a visible light communication system. It is believed that the OIHP photodetectors with high sensitivity, NIR photoresponse, and ultrafast speed would pave the way to commercial applications.
关键词： weak light detection circuit,perovskite photodetectors,fast response,visible light communication,highly sensitive
更新于2025-09-11 14:15:04
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P-12.2: Active Matrix Field Sequential Color Electrically Suppressed Helix Ferroelectric Liquid Crystal for High Resolution Displays
摘要： In this article, we disclose a 3-inch 250ppi active matrix field sequential color electrically suppressed ferroelectric liquid crystal (ESHFLC) display. ESHFLC’s ultra-fast response time (~10μs at 6.67V/μm) enables the display resolution to be tripled via field sequential color technique. Photo-alignment technology provides ESHFLC with optimal anchoring energy which contributes to a high contrast ratio over 10K:1. Specific 3T1C pixel circuit is designed to convert the analog signal to pulse width modulation. Thus the field sequential color ESHFLC display is achieved on LTPS TFT panel. With the delivered prototype, we successfully demonstrate the active matrix FSC ESHFLC integrated display system. We believe this display may replace IPS or FFS in the near future for portable mobile market. Moreover, high resolution FSC ESHFLC can find more applications in emerging virtual reality displays.
关键词： Active Matrix Field Sequential Color,Fast Response,Ferroelectric Liquid Crystal Displays,Virtual Reality
更新于2025-09-10 09:29:36
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Ultra-fast adaptive optical micro-lens arrays based on stressed liquid crystals
摘要： We characterized the optical properties of a photoresist-based micro-lens using a stressed liquid crystal matrix for high-speed variation of the focal distance. We also determined the operational parameters for the adaptive optical spherical and cylindrical micro-lens arrays. The resulting optical elements feature fast response times, around 1 ms, with a focal length range of 2600-970 μm.
关键词： stressed liquid crystals,adaptive optical micro-lens arrays,focal length variation,fast response times
更新于2025-09-09 09:28:46