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Now showing items 1 - 16 of 55

  • RESOURCE SHARING METHOD, RESOURCE ACQUISITION METHOD, TERMINAL AND SERVER

    A resource sharing method, comprising: receiving a resource sharing message configuration file issued in a pre-configured issuing time period; on the basis of the resource sharing message configuration file, acquiring a topic activity time period; in the topic activity time period, displaying a resource sharing message configuration portal; detecting an operation on the resource sharing message configuration portal and entering a resource sharing message configuration page; on the basis of a configuration implemented on the resource sharing message configuration page, acquiring a resource sharing message template matching the topic activity time period and resource information matching the resource sharing message template; on the basis of the acquired resource sharing message template and resource information, generating a resource sharing message, said resource sharing message comprising data used for acquiring resources; and sharing the resource sharing message.
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  • NARROWBAND PHOTODETECTOR

    A narrowband photodetector for detecting radiation in a spectral window, the narrowband photodetector comprising a first electrode that is at least partially transparent to radiation, a second electrode and a photoactive layer that is coated onto at least one of the first electrode, the second electrode and at least one interlayer disposed on at least one of the first and second electrodes. The photoactive layer is provided at least partially between the first and second electrodes, generates charge carriers in response to radiation incident thereon through the first electrode and has an absorption coefficient profile and thickness selected so that radiation in a first spectral window leads to volume generation of charge carriers substantially throughout the photoactive layer and radiation in a second spectral window different to the first spectral window leads to surface generation of charge carriers proximate the first electrode. The photoactive later also has a mobility for charge carriers, such that for an applied voltage across the electrodes, the extraction of surface generated charge carriers is suppressed so that the photodetector shows a photoresponse to radiation in the first spectral window and includes at least one of an inorganic semiconductor and an organic -inorganic hybrid semiconductor.
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  • Progress of the key materials for organic solar cells

    Tong, Yang   Xiao, Zuo   Du, Xiaoyan   Zuo, Chuantian   Li, Yuelong   Lv, Menglan   Yuan, Yongbo   Yi, Chenyi   Hao, Feng   Hua, Yong   Lei, Ting   Lin, Qianqian   Sun, Kuan   Zhao, Dewei   Duan, Chunhui   Shao, Xiangfeng   Li, Wei   Yip, Hin-Lap   Xiao, Zhengguo   Zhang, Bin   Bian, Qingzhen   Cheng, Yuanhang   Liu, Shengjian   Cheng, Ming   Jin, Zhiwen   Yang, Shangfeng   Ding, Liming  

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  • Solution-processed AgBiS2 Photodetectors from Molecular Precursors

    Li, Jiang   Li, Yuwei   Peng, Jiali   Cui, Lihao   Li, Ruiming   Xu, Yalun   Li, Wei   Li, Yanyan   Tian, Xiaoyu   Lin, Qianqian  

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  • Hybrid Perovskites: Prospects for Concentrator Solar Cells

    Lin, Qianqian   Wang, Zhiping   Snaith, Henry J.   Johnston, Michael B.   Herz, Laura M.  

    Perovskite solar cells have shown a meteoric rise of power conversion efficiency and a steady pace of improvements in their stability of operation. Such rapid progress has triggered research into approaches that can boost efficiencies beyond the Shockley-Queisser limit stipulated for a single-junction cell under normal solar illumination conditions. The tandem solar cell architecture is one concept here that has recently been successfully implemented. However, the approach of solar concentration has not been sufficiently explored so far for perovskite photovoltaics, despite its frequent use in the area of inorganic semiconductor solar cells. Here, the prospects of hybrid perovskites are assessed for use in concentrator solar cells. Solar cell performance parameters are theoretically predicted as a function of solar concentration levels, based on representative assumptions of charge-carrier recombination and extraction rates in the device. It is demonstrated that perovskite solar cells can fundamentally exhibit appreciably higher energy-conversion efficiencies under solar concentration, where they are able to exceed the Shockley-Queisser limit and exhibit strongly elevated open-circuit voltages. It is therefore concluded that sufficient material and device stability under increased illumination levels will be the only significant challenge to perovskite concentrator solar cell applications.
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  • Hybrid Perovskites: Prospects for Concentrator Solar Cells

    Lin, Qianqian   Wang, Zhiping   Snaith, Henry J.   Johnston, Michael B.   Herz, Laura M.  

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  • Considerations for Upscaling of Organohalide Perovskite Solar Cells

    Lin, Qianqian   Nagiri, Ravi Chandra Raju   Burn, Paul L.   Meredith, Paul  

    Thin film organohalide lead perovskite-based solar cells have emerged over the last five years as a potentially low-cost, low-embedded-energy and high-efficiency photovoltaic technology. However, almost all reported high-efficiency devices have small active areas significantly less than 1 cm(2). Upscaling of organohalide lead perovskite solar cells is now required for successful manufacturing and commercialization. In this work, three generic design rules for large area devices are proposed. Using these design rules, high efficiency large area (2.0 cm(2)) cells are demonstrated based on a predictive methodology incorporating the optoelectronic design of highly transparent and conductive electrodes, and controlled crystal size and uniformity of the organohalide perovskite junction. These optimized large area monolithic solar cells show power conversion efficiencies (PCEs) >12%, with an enhanced open-circuit voltage (V-oc) of 1.02 V and respectable fill factor (FF) of 0.61.
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  • Efficient, monolithic large area organohalide perovskite solar cells

    Hambsch, Mike   Lin, Qianqian   Armin, Ardalan   Burn, Paul L.   Meredith, Paul  

    Solar cells based on organohalide perovskites (PSCs) have made rapid progress in recent years and are a promising emerging technology. An important next evolutionary step for PSCs is their up-scaling to commercially relevant dimensions. The main challenges in scaling PSCs to be compatible with current c-Si cells are related to the limited conductivity of the transparent electrode, and the processing of a uniform and defect-free organohalide perovskite layer over large areas. In this work we present a generic and simple approach to realizing efficient solution-processed, monolithic solar cells based on methylammonium lead iodide (CH3NH3PbI3). Our devices have an aperture area of 25 cm(2) without relying on an interconnected strip design, therefore reducing the complexity of the fabrication process and enhancing compatibility with the c-Si cell geometry. We utilize simple aluminum grid lines to increase the conductivity of the transparent electrode. These grid lines were exposed to an UV-ozone plasma to grow a thin aluminum oxide layer. This dramatically improves the wetting and film forming of the organohalide perovskite junction on top of the lines, reducing the probability of short circuits between the grid and the top electrode. The best devices employing these modified grids achieved power conversion efficiencies of up to 6.8%.
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  • Organohalide Perovskites for Solar Energy Conversion

    Lin, Qianqian   Armin, Ardalan   Burn, Paul L.   Meredith, Paul  

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  • Considerations for Upscaling of Organohalide Perovskite Solar Cells

    Lin, Qianqian   Nagiri, Ravi Chandra Raju   Burn, Paul L.   Meredith, Paul  

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  • Visible to Near‐Infrared Photodetection Based on Ternary Organic Heterojunctions

    Li, Wei   Xu, Yalun   Meng, Xianyi   Xiao, Zuo   Li, Ruiming   Jiang, Li   Cui, Lihao   Zheng, Meijuan   Liu, Chang   Ding, Liming   Lin, Qianqian  

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  • Filterless narrowband visible photodetectors

    Lin, Qianqian   Armin, Ardalan   Burn, Paul L.   Meredith, Paul  

    Wavelength-selective light detection is crucial for many applications, including imaging and machine vision. Narrowband spectral responses are required for colour discrimination, and current systems use broadband photodiodes combined with optical filters. This approach increases the architectural complexity and limits the quality of colour sensing. Here we report a method for tuning the spectral response to give filterless, narrowband red, green and blue photodiodes. The devices have simple planar junction architectures with the photoactive layer being a solution-processed mixture of either an organohalide perovskite or lead halide semiconductor and an organic (macro) molecule. The organic (macro) molecules modify the optical and electrical properties of the photodiode and facilitate charge collection narrowing of the device's external quantum efficiency. These red, green and blue photodiodes all possess full-width at half-maxima of <100 nm and performance metrics suitable for many imaging applications.
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  • Electro-optics of perovskite solar cells

    Lin, Qianqian   Armin, Ardalan   Nagiri, Ravi Chandra Raju   Burn, Paul L.   Meredith, Paul  

    Organohalide-perovskite solar cells have emerged as a leading next-generation photovoltaic technology. However, despite surging efficiencies, many questions remain unanswered regarding the mechanisms of operation. Here we report a detailed study of the electro-optics of efficient CH3NH3PbI3-perovskite-only planar devices. We report the dielectric constants over a large frequency range. Importantly, we found the real part of the static dielectric constant to be similar to 70, from which we estimate the exciton-binding energy to be of order 2 meV, which strongly indicates a non-excitonic mechanism. Also, Jonscher's Law behaviour was consistent with the perovskite having ionic character. Accurate knowledge of the cell's optical constants allowed improved modelling and design, and using this information we fabricated an optimized device with an efficiency of 16.5%. The optimized devices have similar to 100% spectrally flat internal quantum efficiencies and minimal bimolecular recombination. These findings establish systematic design rules to achieve silicon-like efficiencies in simple perovskite solar cells.
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  • Filterless narrowband visible photodetectors

    Lin, Qianqian   Armin, Ardalan   Burn, Paul L.   Meredith, Paul  

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  • Electro-optics of perovskite solar cells

    Lin, Qianqian   Armin, Ardalan   Nagiri, Ravi Chandra Raju   Burn, Paul L.   Meredith, Paul  

    Organohalide-perovskite solar cells have emerged as a leading next-generation photovoltaic technology. However, despite surging efficiencies, many questions remain unanswered regarding the mechanisms of operation. Here we report a detailed study of the electro-optics of efficient CH3NH3PbI3-perovskite-only planar devices. We report the dielectric constants over a large frequency range. Importantly, we found the real part of the static dielectric constant to be similar to 70, from which we estimate the exciton-binding energy to be of order 2 meV, which strongly indicates a non-excitonic mechanism. Also, Jonscher's Law behaviour was consistent with the perovskite having ionic character. Accurate knowledge of the cell's optical constants allowed improved modelling and design, and using this information we fabricated an optimized device with an efficiency of 16.5%. The optimized devices have similar to 100% spectrally flat internal quantum efficiencies and minimal bimolecular recombination. These findings establish systematic design rules to achieve silicon-like efficiencies in simple perovskite solar cells.
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  • Thick Junction Photodiodes Based on Crushed Perovskite Crystal/Polymer Composite Films

    Peng, Jiali   Cui, Lihao   Li, Ruiming   Xu, Yalun   Li, Jiang   Li, Yuwei   Li, Wei   Tian, Xiaoyu   Lin, Qianqian  

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