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oe1(光电查) - 科学论文

4 条数据
?? 中文（中国） ▾

  • Photoelectricity and thermoelectricity in organic chlorophyll phototransistors

    摘要： As one kind of organic semiconductor materials, Chlorophyll has been attracted great attention with remarkable optical properties. Here, we demonstrate photoresponse and thermoelectric current in the biological Chlorophyll A field effect phototransistors (FEpTs). Meanwhile, it exhibits excellent performances including high responsivity (5×1013 A/W) and relatively fast response time (rise time ~ 20.3 s, fall time ~ 28.2 s) under illumination by 405 nm. Utilizing thermionic emission theory and typical Arrehenius plot, Schottky barrier B is found to be 76.6 meV. The biological phototransistor via low-cost, simple, and scalable fabrication processes opens up new opportunities to realize flexible, transparent organic electronic, and biologically optoelectronic devices.

    关键词： Schottky junction,photoelectricity and thermoelectricity,Chlorophyll,Organic phototransistor

    更新于2025-09-23 15:21:21

  • Near-infrared-II photodetection realized by introducing organic-inorganic charge-transfer-complex photosensitive material into pentacene phototransistor

    摘要： Organic phototransistor (OPT) is a promising photodetector with substantial attention due to its advantages such as low cost, light weight, flexibility and ease of large area preparation. Although the second near-infrared (NIR-II) window (1.0-1.7 microns) has important applications in fiber communication, the organic infrared photosensitive materials are scarce in this waveband, which greatly limits the application of organic photodetectors in near-infrared bands. In this work, a charge-transfer-complex (CTC) film with significant hyperchromic effect in the infrared range of 1000-1400 nm was prepared by co-evaporation of metal oxide WO3 and organic molecule m-MTDATA. A high performance near-infrared OPT was fabricated by combining this CTC photosensitive layer and pentacene (PENT) high-mobility channel layer, the photoresponsivity R of which has surpassed the recent reported level of 1.1 micron band inorganic infrared detector. The physical mechanism underlying the operation of CTC-PENT-OPT was clarified and the thickness of the CTC photosensitive film in this device was optimized. This new type of organic-inorganic CTC infrared-sensitive material will offer a new choice for the future study on organic infrared detectors.

    关键词： Photodetection,Charge-transfer-complex,Pentacene,Near-infrared-II,Organic phototransistor

    更新于2025-09-19 17:13:59

  • Improvement of Photoresponse in Organic Phototransistors through Bulk Effect of Photoresponsive Gate Insulators

    摘要： In this study, we investigate the bulk effect of photoresponsive gate insulators on the photoresponse of organic phototransistors (OPTs), using OPTs with poly(4-vinylphenol) layers of two different thicknesses. For the photoresponse, the interplay between the charge accumulation (capacitance) and light-absorbance capabilities of a photoresponsive gate insulator was investigated. Although an OPT with a thicker gate insulator exhibits a lower capacitance and hence a lower accumulation capability of photogenerating charges, a thicker poly(4-vinylphenol) layer, in contrast to a thinner one, absorbs more photons to generate more electron–hole pairs, resulting in a higher photoresponse of the device. That is, in these two cases, the degree of light absorption by the photoresponsive gate insulators dominantly governed the photoresponse of the device. Our physical description of the bulk effect of photoresponsive insulators on the performance of OPTs will provide a useful guideline for designing and constructing high-performance organic-based photosensing devices and systems.

    关键词： polymer gate insulator,photoresponsive polymer,organic phototransistor,bulk effect,poly(4-vinylphenol)

    更新于2025-09-19 17:13:59

  • Organic single-crystal phototransistor with unique wavelength-detection characteristics; 具有独特波长检测特性的有机单晶光电晶体管;

    摘要： Organic phototransistors based on high-quality 2,8-dichloro-5,11-dihexyl-indolo[3,2-b]carbazo (CHICZ) single show the highest photoresponsivity of 3×103 A W?1, photosensitivity of 2×104 and the detectivity can achieve 8.4×1014 Jones. We also discovered good linear dependence of log(photosensitivity) versus the wavelength when the devices were illuminated with a series of same-intensity but different-wavelength lights. The organic phototransistors based on CHICZ single crystal have potential applications in wavelength-detection.

    关键词： photo-responsivity,photosensitivity,wavelength-detection,organic phototransistor,single crystal

    更新于2025-09-10 09:29:36