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oe1(光电查) - 科学论文

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出版时间
  • 2018
研究主题
  • Flexible display
  • fabrication process
  • electrowetting
  • PEN substrate
应用领域
  • Optoelectronic Information Science and Engineering
机构单位
  • South China Normal University
400 条数据
?? 中文（中国） ▾

  • Inkjet-Printed Organohalide 2D Layered Perovskites for High-Speed Photodetectors on Flexible Polyimide Substrates

    摘要： The synthesis of solution-processed two-dimensional organohalide layered (CH3(CH2)3NH3)2(CH3NH3)n?1PbnI3n+1 (n = 2, 3, and 4) perovskites is presented, where inkjet printing was used to fabricate heterostructure flexible photodetector (PD) devices on polyimide (PI) substrates. Inks for the n = 4 formulation were developed to inkjet-print PD devices that were photoresponsive to broadband incoming radiation in the visible regime, where the peak photoresponsivity R was calculated to be ～0.17 A/W, which is higher compared to prior reports, while the detectivity D was measured to be ～3.7 × 1012 Jones at a low light intensity F ≈ 0.6 mW/cm2. The ON/OFF ratio was also high (～2.3 × 103), while the response time τ on the rising and falling edges was measured to be τ ≈ 24 ms and τ ≈ 65 ms, respectively. Our strain-dependent measurements, conducted here for the first time for inkjet-printed perovskite PDs, revealed that the Ip decreased by only ～27% with bending (radius of curvature of ～0.262 cm?1). This work demonstrates the tremendous potential of the inkjet-printed, composition-tunable, organohalide 2D perovskite heterostructures for high-performance PDs, where the techniques are readily translatable toward flexible solar cell platforms as well.

    关键词： organohalide 2D perovskites,flexible photodetector,inkjet printing,photoluminescence spectroscopy,strain dependency

    更新于2025-09-23 15:19:57

  • Near full light absorption and full charge collection in 1-micron thick quantum dot photodetector using intercalated graphene monolayer electrodes

    摘要： Quantum dots (QDs) offer several advantages in optoelectronics such as easy solution processing, strong light absorption and size tunable direct bandgap. However, their major limitation is their poor film mobility and short diffusion length (<250 nm). This has restricted the thickness of QD film to ～200–300 nm due to the restriction that the diffusion length imposes on film thickness in order to keep efficient charge collection. Such thin films result in a significant decrease in quantum efficiency for λ > 700 nm in QDs photodetector and photovoltaic devices, causing a reduced photoresponsivity and a poor absorption towards the near-infrared part of the sunlight spectrum. Herein, we demonstrate 1 μm thick QDs photodetectors with intercalated graphene charge collectors that avoid the significant drop of quantum efficiency towards λ > 700 nm observed in most QD optoelectronic devices. The 1 μm thick intercalated QD films ensure strong light absorption while keeping efficient charge extraction with a quantum efficiency of 90%–70% from λ = 600 nm to 950 nm using intercalated graphene layers as charge collectors with interspacing distance of 100 nm. We demonstrate that the effect of graphene on light absorption is minimal. We achieve a time-modulation response of <1 s. We demonstrate that this technology can be implemented on flexible PET substrates, showing 70% of the original performance after 1000 times bending test. This system provides a novel approach towards high-performance photodetection and high conversion photovoltaic efficiency with quantum dots and on flexible substrates.

    关键词： Optoelectronics,Photodetectors,Quantum dots,Graphene,Flexible substrates

    更新于2025-09-23 15:19:57

  • Solutiona??Processed Flexible Broadband Photodetectors with Solutiona??Processed Transparent Polymeric Electrode

    摘要： Room-temperature solution-processed flexible photodetectors with spectral response from 300 to 2600 nm are reported. Solution-processed polymeric thin film with transparency ranging from 300 to 7000 nm and superior electrical conductivity as the transparent electrode is reported. Solution-processed flexible broadband photodetectors with a 'vertical' device structure incorporating a perovskite/PbSe quantum dot bilayer thin film based on the above solution-processed transparent polymeric electrode are demonstrated. The utilization of perovskite/PbSe quantum dot bilayer thin film as the photoactive layer extends spectral response to infrared region and boosts photocurrent densities in both visible and infrared regions through the trap-assisted photomultiplication effect. Operated at room temperature and under an external bias of -1 V, the solution-processed flexible photodetectors exhibit over 230 mA W-1 responsivity, over 1011 cm Hz1/2/W photodetectivity from 300 to 2600 nm and ≈70 dB linear dynamic ranges. It is also found that the solution-processed flexible broadband photodetectors exhibit fast response time and excellent flexibility. All these results demonstrate that this work develop a facile approach to realize room-temperature operated ultrasensitive solution-processed flexible broadband photodetectors with 'vertical' device structure through solution-processed transparent polymeric electrode.

    关键词： perovskite photodetectors,broadband photodetectors,PbSe quantum dots,flexible electronics

    更新于2025-09-23 15:19:57

  • Interfacial fracture investigation of patterned active matrix OLED driven by amorphous-Si TFTs under film-type packaging technology

    摘要： Considering the structural stability for active-matrix organic light-emitting diode (AMOLED) application, the reliability of lamination interfaces has become a major concern. The comprehensive influence of structural design integrated with material selections should be carefully examined and estimated. The layout effect of embedded pattern defined layer (PDL) plays an important role in the actual AMOLED architecture. To address the issue of stress-induced failure mechanism of PDL under external loads due to external bending, fracture mechanics-based finite element analysis integrated with Tsai–Hill criterion is utilized in this research. Simulated results indicate that the declined thickness and 45° oblique angle design for PDL prevents the failure occurrence of concerned interfaces. Notably, multiple neutral axis (NA) occurs when an extra-low Young’s modulus of pressure-sensitive adhesive (PSA) is considered. Multiple NA design prevents brittle fracture failure occurrence in gas barrier architecture, while these multiple NAs shift to adjust to the foregoing location. Accordingly, a proper arrangement of these multiple NAs in AMOLED packaging encapsulation through the selection of material characteristics and stacked thickness of PSA thin film has the advantage to enhance structural reliability.

    关键词： Multiple neutral axis,Layout pattern effect,Flexible display,Interfacial fracture

    更新于2025-09-23 15:19:57

  • Epitaxial CdTe Thin Films on Mica by Vapor Transport Deposition for Flexible Solar Cells

    摘要： Most high-quality CdTe thin films are epitaxially grown on single-crystalline substrates through chemical bondings by either molecular beam epitaxy or metalorganic chemical vapor deposition. The epitaxial CdTe films are rarely applied in electronic or optoelectronic devices because of the rigid single-crystalline substrate. We present high-quality CdTe films epitaxially grown on mica by vapor transport deposition process through weak interface interactions. The full-width-at-half-maximum (FWHM) of X-ray diffraction rocking curve of CdTe(111) and the FWHM of azimuthal in-plane angular dispersion of CdTe(111) were 0.23° and 0.36°, respectively. The weak interaction at the interface enables a transfer of the epitaxial film from mica onto other flexible substrates for applications. The epitaxial CdTe film was separated from the mica substrate by the surface tension of water during immersion, and then transferred onto a flexible SU-8 photoresist substrate for the fabrication of CdTe solar cells. We successfully fabricated the flexible all-epitaxial, epi-CdS/epi-CdTe solar cells with a power conversion efficiency of 9.59%, which showed low interface defects and high diode quality compared to the poly-CdS/epi-CdTe solar cells.

    关键词： epitaxy,van der Waals,vapor transport deposition,CdTe,flexible photovoltaics

    更新于2025-09-23 15:19:57

  • Ag-fiber/graphene hybrid electrodes for highly flexible and transparent optoelectronic devices

    摘要： Transparent conducting electrodes (TCEs) have attracted considerable attention towards the development of flexible optoelectronic devices. In this study, mixed-dimensional TCEs are fabricated based on the two-dimensional graphene and one-dimensional electrospun metal fiber that can address the shortcomings of each electrode. In comparison with other TCEs, the Ag fiber/graphene hybrid electrodes exhibited a highly stable morphology (67% lower peak-to-valley ratio), low sheet resistance (approximately 11 Ω/sq), high transmittance (approximately 94%), high oxidation stability with excellent flexibility, and outstanding chemical stability. The multiple functionalities of the transparent and flexible hybrid structure highlight its potential for applications in emerging electronics and highly stable optoelectronics.

    关键词： transparent conducting electrodes,Ag-fiber/graphene hybrid electrodes,flexible optoelectronic devices,graphene,electrospun metal fiber

    更新于2025-09-23 15:19:57

  • Surface Engineering of Low-Temperature Processed Mesoporous TiO <sub/>2</sub> via Oxygen Plasma for Flexible Perovskite Solar Cells

    摘要： A major problem in the application of mesoporous TiO2 as an electron transport layer for flexible perovskite solar cells is that a high temperature sintering process is required to remove organic additives from the TiO2 layer. A facile oxygen plasma process is herein demonstrated to fabricate mesoporous structured perovskite solar cells with significant photovoltaic performance at low temperatures. When the low-temperature processed TiO2 layer is modified via oxygen plasma, the organic additives in the TiO2 layer that hinder the charge transport process are successfully decomposed. The oxygen plasma treatment improves the wettability and infiltration of the perovskite layer and also passivates the oxygen vacancy related traps in TiO2. Hence, the oxygen plasma treatment evidently enhances charge extraction and transport, thereby improving photovoltaic performance and decreasing hysteresis.

    关键词： Mesoporous TiO2,Flexible solar cell,Oxygen plasma,Low-temperature processed TiO2,Perovskite solar cell

    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

  • [IEEE 2018 15th IEEE India Council International Conference (INDICON) - Coimbatore, India (2018.12.16-2018.12.18)] 2018 15th IEEE India Council International Conference (INDICON) - Influence of the Compositional Variation of Zn <sub/>x</sub> Cd <sub/>1a??x</sub> S (0 a?¤ x a?¤ 0.45) Buffer on Efficiency of Cu <sub/>2</sub> ZnSnSe <sub/>4</sub> Solar Cell: A Simulation

    摘要： This paper investigates the manufacturability-aware process of p-n junction formation for photovoltaic cells involving with Si nanoparticle layer. The furnace-based dopant diffusion process of forming a p-n junction consumes a substantial amount of energy. In addition, repetitive production steps prevent the possibility of Si ink-based cells integrating onto ?exible substrates. This research examined the local heating dopant diffusion process by using a ?ber laser at a wavelength of 1064 nm. The infrared beam is delivered onto the wafer stack with a nanoparticle carbon layer and n-type Si ink layer on p-type Si substrates. The nanoparticle carbon ?lm absorbs infrared beam energy and converts photon energy as a thermal source to diffuse the n-type dopant in Si ink into the p-type Si wafer. The Si ink in this paper contains a mixture of Si nanoparticles and an n-type spin-on dopant solution. The TEM results show that Si nanoparticles are uniformly dispersed on the Si wafer surface. This research investigated sheet resistance as a function of laser parameters, including laser power, scanning speed, and pulse frequency for the samples coated with Si ink. Secondary ion mass spectroscopy measurements indicate the presence of an n-type dopant in p-type substrates, with an approximate diffusion depth of 100 nm. The results indicate that the proposed infrared laser treatment technique is promising for the formation of p-n junctions with Si ink-based photovoltaic cells.

    关键词： silicon ink,spin-on dopant (SOD),silicon nanoparticle,carbon nanoparticle,?ber laser,Flexible photovoltaic cell,pn junction

    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