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oe1(光电查) - 科学论文

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  • 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

  • Size-Programmed Synthesis of PbSe Quantum Dots via Secondary Phosphine Chalcogenides

    摘要： In the most common syntheses of colloidal nanocrystal quantum dots (QDs) the size of the particle increases monotonically with reaction time. We have discovered a PbSe QD synthesis whereby size can be easily controlled by varying the side-chains of a secondary phosphine selenide precursor. The reaction runs to completion, and thus a desired QD diameter can be achieved by simply selecting an appropriate secondary phosphine. Quenching of the reaction to select a desired QD size is not required. For different secondary phosphine selenides, measurements of the precursor conversion rate show a direct relationship with final QD size, while P=Se bond strength calculations show an unexpected inverse relationship between QD size and P=Se bond strength. Finally, it is also demonstrated that secondary phosphine selenide precursors can provide an effective route for IV-VI QD syntheses on the large scale.

    关键词： colloidal synthesis,size control,IV-VI QDs,secondary phosphine selenide,PbSe quantum dots

    更新于2025-09-12 10:27:22