共查询到17条相似文献，搜索用时 46 毫秒
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给出了载流子迁移率的各种测量方法,渡越时间（TOP）法、霍尔效应法、电压衰减法、辐射诱发导电率（SIC）法、表面波传输法、外加电场极性反转法和电流-电压特性法,并给出了这些测量方法的使用范围。 相似文献
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载流子迁移率测量方法总结 总被引：5，自引：0，他引：5
给出了载流子迁移率的各种测量方法,渡越时间（TOP）法、霍尔效应法、电压衰减法、辐射诱发导电率（SIC）法、表面波传输法、外加电场极性反转法和电流—电压特性法,并给出了这些测量方法的使用范围。 相似文献
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载流子迁移测量的光电方法 总被引：1，自引：0，他引：1
本文评述了载流子迁移率测量的各种方法,着重介绍了光电测量的渡越时间（TOF）方法,并对几种新的含偶氮基,硝基及咔唑基的光电功能材料进行了测量,给出了迁移率的测量结果。 相似文献
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近些年来的研究结果认为,用Si_(1-x)Ge_x伪晶作成的异质结晶体管是采用硅工艺制作的高速高频器件的最大竞争对手。它的发展速度很快,在很短的时间内就从实验室内的珍品发展成为以硅工艺为基础的速度最快的双极晶体管,不仅设计制成了n-p-n和p-n-p管,而且制成了Si_(1-x)Ge_x伪晶异质结晶体管(PHBT)的集成电路,并获得满意的结果。采用二维漂移扩散(DD)模拟和一维流体学模拟(HD)来分析这类晶体管的高频性能,证明它们的f_r为70GHz左右。 相似文献
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分析了器件中载流子迁移率的基本理论及其受温度、掺杂浓度、栅极电压以及漏极电压的影响,并总结了测量器件中载流子迁移率的几种常用的方法。 相似文献
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Mujeeb Ullah Chaudhry Julianna Panidi Sungho Nam Alice Smith Jongchul Lim Kornelius Tetzner Panos A. Patsalas George Vourlias Wai‐Yu Sit Yuliar Firdaus Martin Heeney Donal D. C. Bradley Thomas D. Anthopoulos 《Advanced Electronic Materials》2020,6(1)
The vast majority of conjugated‐polymer‐based light emitting field‐effect transistors (LEFETs) are characterized by low charge‐carrier mobilities typically in the 10−5 to 10−3 cm2 V−1 s−1 range. Fast carrier transport is a highly desirable characteristic for high‐frequency LEFET operation and, potentially, for use in electrically pumped lasers. Unfortunately, high‐mobility organic semiconductors are often characterized by strong intermolecular π–π interactions that reduce luminescence. Development of new materials and/or device concepts that overcome this hurdle are therefore required. Single organic semiconductor layer based LEFETs that combine high hole mobilities with encouraging light emission characteristics are reported. This is achieved in a single polymer layer LEFET, which is further enhanced through the use of a small‐molecule/conjugated polymer blend system that possesses a film microstructure which supports enhanced charge‐carrier mobility (3.2 cm2 V−1 s−1) and promising light‐emission characteristics (1600 cd m−2) as compared to polymer‐only based LEFETs. This simple approach represents an attractive strategy to further advance the performance of solution‐processed LEFETs. 相似文献
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J. C. Erickson H. W. Yao R. B. James H. Hermon M. Greaves 《Journal of Electronic Materials》2000,29(6):699-703
A time of flight technique was used to study the carrier trapping time, τ, and mobility, μ, in CdZnTe (CZT) and CdTe radiation
detectors. Carriers were generated near the surface of the detector by a nitrogen-pumped pulsed dye laser with wavelength
∼500 nm. Signals from generated electrons or holes were measured by a fast oscilloscope and analyzed to determine the trapping
time and mobility of carriers. Electron mobility was observed to change with temperature from 1200 cm2/Vs to 2400 cm2/Vs between 293 K and 138 K, respectively. Electron mobilities were observed between 900 cm2/Vs and 1350 cm2/Vs at room temperature for various CZT detectors. Electron mobilities in various CdTe detectors at room temperature were
observed between 740 cm2/Vs and 1260 cm2/Vs. Average electron mobility was calculated to be 1120 cm2/Vs and 945 cm2/Vs for CZT and CdTe, respectively. Hole mobilities in both CZT and CdTe were found to vary between 27 cm2/Vs and 66 cm2/Vs. Electron trapping times in CZT at room temperature varied from 1.60 μs to 4.18 μs with an average value of about 2.5
μs. Electron trapping time in CdTe at room temperature varied between 1.7 μs and 4.15 μs with an average value of about 3.1
μs. 相似文献
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Hans Gommans Tom Aernouts Bregt Verreet Paul Heremans Anaïs Medina Christian G. Claessens Tomas Torres 《Advanced functional materials》2009,19(21):3435-3439
The complex refractive index of fluorinated subphthalocyanines (SubPcs) deposited by vacuum sublimation is determined by spectral ellipsometry. Their performance as acceptor material is characterized in a range of donor/acceptor heterojunctions in organic photovoltaic cells (OPVCs) by current–voltage measurements under 1 sun AM 1.5D simulated solar illumination and spectral response. Both electron and hole transfer between donor and acceptor materials is demonstrated. Power conversion efficiencies of 0.96% are found with an open‐circuit bias of 940 mV. Hence, it is shown that fluorinated SubPcs can be considered as an acceptor material in OPVCs with an absorption in the visible comparable to that of well‐known metallophthalocyanines. 相似文献
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Zhuxian Zhou Youqing Shen Jianbin Tang Maohong Fan Edward A Van Kirk William J Murdoch Maciej Radosz 《Advanced functional materials》2009,19(22):3580-3589
DNA‐toxin anticancer drugs target nuclear DNA or its associated enzymes to elicit their pharmaceutical effects, but cancer cells have not only membrane‐associated but also many intracellular drug‐resistance mechanisms that limit their nuclear localization. Thus, delivering such drugs directly to the nucleus would bypass the drug‐resistance barriers. The cationic polymer poly(L ‐lysine) (PLL) is capable of nuclear localization and may be used as a drug carrier for nuclear drug delivery, but its cationic charges make it toxic and cause problems in in‐vivo applications. Herein, PLL is used to demonstrate a pH‐triggered charge‐reversal carrier to solve this problem. PLL's primary amines are amidized as acid‐labile β‐carboxylic amides (PLL/amide). The negatively charged PLL/amide has a very low toxicity and low interaction with cells and, therefore, may be used in vivo. But once in cancer cells' acidic lysosomes, the acid‐labile amides hydrolyze into primary amines. The regenerated PLL escapes from the lysosomes and traverses into the nucleus. A cancer‐cell targeted nuclear‐localization polymer–drug conjugate has, thereby, been developed by introducing folic‐acid targeting groups and an anticancer drug camptothecin (CPT) to PLL/amide (FA‐PLL/amide‐CPT). The conjugate efficiently enters folate‐receptor overexpressing cancer cells and traverses to their nuclei. The CPT conjugated to the carrier by intracellular cleavable disulfide bonds shows much improved cytotoxicity. 相似文献
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Sangjin Lee David Zhitomirsky Jeffrey C. Grossman 《Advanced functional materials》2016,26(10):1554-1562
A realistic CQD solid model is developed that computes the charge carrier mobility using hopping transport models within an ensemble of individual CQD units. Large decreases in electron mobility of up to 70% as compared to the monodisperse case are observed when the energetic disorder in CQD films lies in the typical experimental range of 10%–15%. Furthermore, it is suggested that tailored and potentially experimentally achievable re‐arrangement of the CQD size ensemble combined with spatial doping control can mediate the reduction in mobility even in highly dispersive cases, and presents an avenue toward improved mobility and photovoltaic performance by up to 9% by leveraging fast carrier transport channels in highly polydisperse materials. 相似文献