Organic semiconductor materials have shown unique advantages in the development of optoelectronic devices due to their ease of preparation,low cost,lightweight,and flexibility.In this work,we explored the application ...Organic semiconductor materials have shown unique advantages in the development of optoelectronic devices due to their ease of preparation,low cost,lightweight,and flexibility.In this work,we explored the application of the organic semiconductor Y6-1O single crystal in photodetection devices.Firstly,Y6-1O single crystal material was prepared on a silicon substrate using solution droplet casting method.The optical properties of Y6-1O material were characterized by polarized optical microscopy,fluorescence spectroscopy,etc.,confirming its highly single crystalline performance and emission properties in the near-infrared region.Phototransistors based on Y6-1O materials with different thicknesses were then fabricated and tested.It was found that the devices exhibited good visible to near-infrared photoresponse,with the maximum photoresponse in the near-infrared region at 785 nm.The photocurrent on/off ratio reaches 10^(2),and photoresponsivity reaches 16 mA/W.It was also found that the spectral response of the device could be regulated by gate voltage as well as the material thickness,providing important conditions for optimizing the performance of near-infrared photodetectors.This study not only demonstrates the excellent performance of organic phototransistors based on Y6-1O single crystal material in near-infrared detection but also provides new ideas and directions for the future development of infrared detectors.展开更多
Daily precipitation anomalies in the western North Pacific(WNP)and East Asia(EA)exhibit significant intraseasonal variability,peaking at 10-30-day time scales.It has been suggested that boreal summer intraseasonal osc...Daily precipitation anomalies in the western North Pacific(WNP)and East Asia(EA)exhibit significant intraseasonal variability,peaking at 10-30-day time scales.It has been suggested that boreal summer intraseasonal oscillation(BSISO)on 30-60-day time scales is strongly modulated by El Niño-Southern Oscillation(ENSO)with stronger intensity and propagation during La Niña compared to El Niño summers,but the dependency of 10-30-day BSISO on ENSO has not been well understood.Here,we show that the intensity and northward propagation of the 10-30-day BSISO convection over the WNP-EA region are stronger and more organized during El Niño developing summers than other summers,including neutral summers.During El Niño developing summers,the BSISO-induced precipitation and low-level circulation tend to exhibit a stronger meridional tripolar pattern than those during neutral summers.We highlight that the strengthening of 10-30-day BSISO northward propagation and associated rainfall anomalies over EA in El Niño developing summers is contributed by not only the previously proposed stronger air-sea interaction with a larger meridional gradient of sea surface temperature,but also an enhanced dynamic process with stronger relative vorticity and moisture convergence.展开更多
基金Supported by the National Key Research and Development Program of China(2021YFB2012601)National Natural Science Foundation of China(12204109)+1 种基金Science and Technology Innovation Plan of Shanghai Science and Technology Commission(21JC1400200)Higher Education Indus⁃try Support Program of Gansu Province(2022CYZC-06)。
文摘Organic semiconductor materials have shown unique advantages in the development of optoelectronic devices due to their ease of preparation,low cost,lightweight,and flexibility.In this work,we explored the application of the organic semiconductor Y6-1O single crystal in photodetection devices.Firstly,Y6-1O single crystal material was prepared on a silicon substrate using solution droplet casting method.The optical properties of Y6-1O material were characterized by polarized optical microscopy,fluorescence spectroscopy,etc.,confirming its highly single crystalline performance and emission properties in the near-infrared region.Phototransistors based on Y6-1O materials with different thicknesses were then fabricated and tested.It was found that the devices exhibited good visible to near-infrared photoresponse,with the maximum photoresponse in the near-infrared region at 785 nm.The photocurrent on/off ratio reaches 10^(2),and photoresponsivity reaches 16 mA/W.It was also found that the spectral response of the device could be regulated by gate voltage as well as the material thickness,providing important conditions for optimizing the performance of near-infrared photodetectors.This study not only demonstrates the excellent performance of organic phototransistors based on Y6-1O single crystal material in near-infrared detection but also provides new ideas and directions for the future development of infrared detectors.
基金funded by the National Research Foundation of Korea(Grant Nos.NRF-2022R1A2C1013296,NRF-2022M3K3A1097082,and RS-2024-00416848)the National Natural Science Foundation of China(Grant No.NSFC042088101).
文摘Daily precipitation anomalies in the western North Pacific(WNP)and East Asia(EA)exhibit significant intraseasonal variability,peaking at 10-30-day time scales.It has been suggested that boreal summer intraseasonal oscillation(BSISO)on 30-60-day time scales is strongly modulated by El Niño-Southern Oscillation(ENSO)with stronger intensity and propagation during La Niña compared to El Niño summers,but the dependency of 10-30-day BSISO on ENSO has not been well understood.Here,we show that the intensity and northward propagation of the 10-30-day BSISO convection over the WNP-EA region are stronger and more organized during El Niño developing summers than other summers,including neutral summers.During El Niño developing summers,the BSISO-induced precipitation and low-level circulation tend to exhibit a stronger meridional tripolar pattern than those during neutral summers.We highlight that the strengthening of 10-30-day BSISO northward propagation and associated rainfall anomalies over EA in El Niño developing summers is contributed by not only the previously proposed stronger air-sea interaction with a larger meridional gradient of sea surface temperature,but also an enhanced dynamic process with stronger relative vorticity and moisture convergence.
