In this paper, we present experimental results and simulation data of an electrostatically doped and therefore voltage-programmable, planar, CMOS-compatible field-effect transistor (FET) structure. This planar device is based on our previously published Si-nanowire (SiNW) technology. Schottky barrier source/drain (S/D) contacts and a silicon-on-insulator (SOI) technology platform are the key features of this dual-gated but single channel universal FET. The combination of two electrically independent gates, one back-gate for S/D Schottky barrier modulation as well as channel formation to establish Schottky barrier FET (SBFET) operation and one front-gate forming a junctionless FET (JLFET) for actual current control, significantly increases the temperature robustness of the device.
Self-aligned graphene field-effect transistors with polyethyleneimine doped source/drain access regions
我们报道了一种采用聚乙烯亚胺旋涂掺杂源极/漏极接入区制造自对准顶栅石墨烯场效应晶体管(GFET)的方法,与未掺杂器件相比,该方法导致接入电阻降低2倍,器件电特性改善2.5倍。Si/SiO $_2$衬底上的GFET具有高达6,300 cm $^2$ /Vs的高载流子迁移率。自对准旋涂掺杂适用于任意衬底上的GFET,如绝缘石英衬底上的GFET的性能提高3倍所证明的,其更适合于射频应用。
Using accurate dissipative DFT-NEGF atomistic-simulation techniques within the Wannier-Function formalism, we give a fresh look at the possibility of sub-10 nm scaling for high-performance CMOS applications. We show that a combination of good electrostatic control together with a high mobility is paramount to meet the stringent roadmap targets. Such requirements typically play against each other at sub-10 nm gate length for MOS transistors made of conventional semiconductor materials like Si, Ge or III-V and dimensional scaling is expected to end around 12 nm gate-length. We demonstrate that u…
Graphene field-effect transistors are widely used for development of biosensors. However, certain fundamental questions about details of their functioning are not fully understood yet. One of these questions is the presence of gate (leakage) currents in the electrolyte-gated configuration. Here, we report our observations considering causes of this phenomena on chemical vapor deposition (CVD) grown graphene. We observed that gate currents reflect currents that occur on the transistor surface similarly to a working electrode - counter electrode pair currents in an electrochemical cell. Gate cur…
We integrate ambipolar quantum dots in silicon fin field-effect transistors using exclusively standard complementary metal-oxide-semiconductor fabrication techniques. We realize ambipolarity by replacing conventional highly-doped source and drain electrodes by a metallic nickel silicide with Fermi level close to the silicon mid-gap position. Such devices operate in a dual mode, either as classical field-effect or single-electron transistor. We implement a classical logic NOT gate at low temperature by tuning two interconnected transistors into opposite polarities. In the quantum regime, we dem…
Manipulating the electron spin with the aid of spin-orbit coupling (SOC) is an indispensable element of spintronics. Electrostatically gating a material with strong SOC results in an effective magnetic field which can in turn be used to govern the electron spin. In this work, we report the existence and electrostatic tunability of Rashba SOC in multilayer InSe. We observed a gate-voltage-tuned crossover from weak localization (WL) to weak antilocalization (WAL) effect in quantum transport studies of InSe, which suggests an increasing SOC strength. Quantitative analyses of magneto-transport stu…
Field-Effect Transistors Based on Few-Layered alpha-MoTe_2
本文报道了在SiO_2上用机械剥离法生长的几层化学气相传输法生长的α- MoTe_2晶体的场效应晶体管的特性。我们进行了场效应和霍尔迁移率测量,以及拉曼散射和透射电子显微镜。与MoS_2和MoSe_2相比,我们的MoTe_2场效应晶体管(FET)被观察到是空穴掺杂的,显示超过106的开/关比和典型的亚阈值摆幅为每十倍约140 mV。场效应迁移率和霍尔迁移率的最大值接近或超过10 cm ^2/Vs,这与以前报道的室温下单层或双层MoS_2和/或MoSe_2在SiO_2上剥离的数据相当。拉曼散射揭示了尖锐的模式与以前的报告,其频率被发现显示很少或没有依赖于层数。由于两种MoS_2都是电子掺杂的,MoTe_2在MoS_2上的堆叠可以产生双极场效应晶体管和间隙调制。尽管MoTe_2的总体电子性能与MoS_2和MoSe_2相当,但较重的元素Te应该会导致更强的自旋轨道耦合,并可能伴随着更长的激子谷和自旋指数的退相干时间。
The advent of black phosphorus field-effect transistors (FETs) has brought new possibilities in the study of two-dimensional (2D) electron systems. In a black phosphorus FET, the gate induces highly anisotropic 2D electron and hole gases. Although the 2D hole gas in black phosphorus has reached high carrier mobilities that led to the observation of the integer quantum Hall effect, the improvement in the sample quality of the 2D electron gas (2DEG) has however been only moderate; quantum Hall effect remained elusive. Here, we obtain high quality black phosphorus 2DEG by defining the 2DEG region…
Controlling the flow of charge neutral interlayer exciton (IX) quasiparticles can potentially lead to low loss excitonic circuits. Here, we report unidirectional transport of IXs along nanoscale electrostatically defined channels in an MoSe$_2$-WSe$_2$ heterostructure. These results are enabled by a lithographically defined triangular etch in a graphene gate to create a potential energy ''slide''. By performing spatially and temporally resolved photoluminescence measurements, we measure smoothly varying IX energy along the structure and high-speed exciton flow with a drift velocity up to 2 * 1…
In this paper, we investigated the performance of thin-film transistors (TFTs) with different channel configurations including single-active-layer (SAL) Sn-Zn-O (TZO), dual-active-layers (DAL) In-Sn-O (ITO)/TZO, and triple-active-layers (TAL) TZO/ITO/TZO. The TAL TFTs were found to combine the advantages of SAL TFTs (a low off-state current) and DAL TFTs (a high mobility and a low threshold voltage). The proposed TAL TFTs exhibit superior electrical performance, e.g. a high on-off state current ratio of 2*10^8, a low threshold voltage of 0.52 V, a high saturation mobility of 145.2 cm2/Vs, and …
The electrical functionality of an array of semiconductor nanocrystals depends critically on the free carriers that may arise from impurity or surface doping. Herein, we used InAs nanocrystals thin films as a model system to address the relative contributions of these doping mechanisms by comparative analysis of as-synthesized and Cu-doped nanocrystal based field-effect transistor (FET) characteristics. By applying FET simulation methods used in conventional semiconductor FETs, we elucidate surface and impurity-doping contributions to the overall performance of InAs NCs based FETs. As-synthesi…