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Electronic transport in MoSe <sub/>2</sub> FETs modified by latent tracks created by swift heavy ion irradiation
摘要： Unique characteristics of transition metal dichalcogenides (TMDCs) such as their tunable band gap and ultra-thin body thickness make them potential candidates for applications in optoelectronic, gas sensing and energy storage devices. In this work, 1.8 GeV Ta ions at different ion fluences ranging from 1 × 109 ions cm?2 to 6 × 1010 ions cm?2 were used to introduce amorphous defective regions, latent tracks, in MoSe2 to study the electronic transport behavior in irradiated TMDC-channel field-effect transistors (FETs). Defects in these materials induced by the swift heavy ion irradiation play a vital role in the device applications. The results show that carrier mobility decreases while resistance of the devices increases abruptly with increasing ion fluences. The impact mechanism of the latent tracks on electronic transport behavior in TMDC-channel FETs was analyzed in detail. It was assumed that the Bloch wave of electrons was strongly localized by the latent tracks induced by the SHI irradiation and the Bloch wave of electrons can be scattered by the latent tracks as well. This study helps to investigate the influence of the latent tracks on electronic transport in other 2D materials as well.
关键词： latent track,field-effect transistor,molybdenum selenide,electronic transportation,swift heavy ion irradiation
更新于2025-11-14 17:03:37
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Role of intermediate species in the formation of an energetic ion latent track in PADC: A review
摘要： This review paper intends at identifying the early processes arising during the formation of a latent ion track in Poly Allyl Diglycol Carbonate (PADC). We briefly summarize the physical and chemical processes specific to the description of the interaction of ionizing radiation with matter. Then we gather published information in relation to PADC response regarding energy absorption and further transient species formation. Emphasis is given to the chemistry of radicals. Due to a lack of available data in relation with clearly identified unpaired electron carriers in PADC, we use data stemming from surrogate molecules. Based on such data we suggest mechanisms for the decomposition of PADC during the early times of ion track formation. The a-sites of ether functional groups in PADC appear undoubtedly as critical targets which during further decomposition behave as the most probable origin of Carbon dioxide release. All suggested mechanisms are multi-step processes. Combining different concepts and data in relation with the dynamics of transient species formed in the ion track of a polymer material, we propose that the effective track radius may be described as the radial extension of reactive species formed rather than the maximum distance at which d-rays escape out of ion’s trajectory. Lastly, generalization of the different processes collected allows two major pathways to be proposed for describing the fate of damaged ether moieties in PADC. This way, evidence is given for a higher sensitivity of ether functional groups compared to ester carbonate ones. The latter generally being destroyed as a consequence of prior damaging of the ether group.
关键词： Latent track,latent track dynamics,Track core & penumbra,Free radicals,PADC
更新于2025-09-19 17:15:36
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The influence of stopping power and temperature on latent track formation in YAP and YAG
摘要： Transmission electron microscopy techniques were used to analyse the effect of swift heavy ion irradiation on both yttrium aluminium perovskite (YAP) YAlO3, and yttrium aluminium garnet (YAG) Y3Al5O12 single crystals. The crystals were irradiated with Kr, Xe and Bi ions with energies ranging from 107 to 1030 MeV. These ions have electronic stopping powers in the range from 11 to 41 keV/nm. The ion fluences were all within the non-overlapping regime for latent ion tracks i.e. 1011–1012 cm?2. A number of crystals were also irradiated at different temperatures of 80, 300 and 1000 K at a fixed stopping power. Latent ion tracks with an amorphous core were observed in all samples. The track diameters were seen to increase with increasing stopping power. Track diameters only increase by a significant amount as a result of irradiation temperature at 1000 K, whereas the diameters at 80 and 300 K differ only slightly. Ion tracks in YAG were also found to be larger than those in YAP at comparable stopping powers. It was found that on average 10 keV/nm of extra energy input is required to produce ion tracks in YAP with diameters similar to those in YAG. The results also suggest that the complexity of the crystal structure plays a significant role in the formation of ion tracks in these crystals.
关键词： YAG,Radiation damage,YAP,Latent track,TEM,Swift heavy ion
更新于2025-09-10 09:29:36