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Semiconductor Material and Device Characterization, 3rd Edition

01 Dec 2005-pp 840
Abstract: DESCRIPTION This Third Edition updates a landmark text with the latest findings The Third Edition of the internationally lauded Semiconductor Material and Device Characterization brings the text fully up-to-date with the latest developments in the field and includes new pedagogical tools to assist readers. Not only does the Third Edition set forth all the latest measurement techniques, but it also examines new interpretations and new applications of existing techniques.
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Journal ArticleDOI
06 Feb 2014-ACS Nano
TL;DR: It is found that intrinsic defects in MoS2 dominate the metal/MoS2 contact resistance and provide a low Schottky barrier independent of metal contact work function.
Abstract: Achieving low resistance contacts is vital for the realization of nanoelectronic devices based on transition metal dichalcogenides. We find that intrinsic defects in MoS2 dominate the metal/MoS2 contact resistance and provide a low Schottky barrier independent of metal contact work function. Furthermore, we show that MoS2 can exhibit both n-type and p-type conduction at different points on a same sample. We identify these regions independently by complementary characterization techniques and show how the Fermi level can shift by 1 eV over tens of nanometers in spatial resolution. We find that these variations in doping are defect-chemistry-related and are independent of contact metal. This raises questions on previous reports of metal-induced doping of MoS2 since the same metal in contact with MoS2 can exhibit both n- and p-type behavior. These results may provide a potential route for achieving low electron and hole Schottky barrier contacts with a single metal deposition.

661 citations


Cites background from "Semiconductor Material and Device C..."

  • ...Pd, and Au show qualitatively similar characteristics to those observed with the tungsten probe; that is, their reverse bias currents are near the same values as their respective forward bias currents (contrary to what would be expected from their predicted Schottky barrier heights, for Au and Pd in particular).(40) In contrast, Cr and TiN exhibit notably different behavior....

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Journal ArticleDOI
TL;DR: Efficient lead (Pb)-free inverted planar formamidinium tin triiodide (FASnI3 ) perovskite solar cells (PVSCs) are demonstrated and exhibit small photocurrent-voltage hysteresis and high reproducibility.
Abstract: Efficient lead (Pb)-free inverted planar formamidinium tin triiodide (FASnI3 ) perovskite solar cells (PVSCs) are demonstrated. Our FASnI3 PVSCs achieved average power conversion efficiencies (PCEs) of 5.41% ± 0.46% and a maximum PCE of 6.22% under forward voltage scan. The PVSCs exhibit small photocurrent-voltage hysteresis and high reproducibility. The champion cell shows a steady-state efficiency of ≈6.00% for over 100 s.

588 citations

Journal ArticleDOI

266 citations


Cites background from "Semiconductor Material and Device C..."

  • ..., as transport layers.[224] When the film thickness t is unknown, a sheet resistance Rs = ρ/t, in units Ω sq−1, is reported....

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Journal ArticleDOI
TL;DR: An up-to-date review of the several extraction methods commonly used to determine the value of the threshold voltage of MOSFETs, which includes the different methods that extract this quantity from the drain current versus gate voltage transfer characteristics measured under linear operation conditions for crystalline and non-crystalline MOSfETs.

221 citations


Cites methods from "Semiconductor Material and Device C..."

  • ...the point of maximum transconductance, gm) [1,4,6,80,81,87]....

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  • ...The Linear Extrapolation method can be used in the saturation region, using the I D VG characteristics [1,6] as illustrated in Fig....

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  • ...The following methods will be examined: (1) Constant Current (CC) method, which defines VT as the gate voltage corresponding to a certain predefined practical constant drain current [1,2,4,6,54,64,71,79]; (2) Match-Point (MP) method, which defines VT as the gate voltage at a pre-established deviation percentage of the drain current from its extrapolated weak inversion conduction behavior [39]; (3) Linear Extrapolation (LE) method, which defines VT as the gate voltage axis intercept of the tangent of the ID–VG characteristics at its maximum first derivative (slope) point, [1,2,4,6,80,81,87]; (4) Second Derivative (SD) method, which defines VT as the gate voltage at the maximum of the second derivative of the ID–VG characteristics [36]; (5) Third-derivative (TD) method which defines VT as the gate voltage at the maximum of the third derivative of the ID–VG characteristics, in contradiction to the SD method [63]; (6) Current-to-square-root-of-the-Transconductance Ratio (CsrTR) method, which defines VT as the gate voltage axis intercept of the ratio of the drain current to the square root of the transconductance [37,38,46,70,77]; (7) Transition method which defines VT at the transition between weak and strong conduction behaviors [56], inspired on the integral difference function D [88,89]; (8) Normalized Mutual Integral Difference Method (NMID), also an integration-based method following the ideas of the previous one [65]; (9) Normalized Reciprocal H function (NRH) method, which is an improvement to the NMID method; and (10) Transconductance-to-Current-Ratio (TCR) [31,45,68,72,73], and its integration-based counterpart the Reciprocal H function (RH) method [69]....

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Journal ArticleDOI
TL;DR: It is confirmed that WTe2 has its minimum energy configuration in a distorted 1T structure (Td structure), which results in metallic-like transport, and the utilization of W Te2 in electronic device architectures such as field effect transistors may need to be reevaluated.
Abstract: Tungsten ditelluride (WTe2) is a transition metal dichalcogenide (TMD) with physical and electronic properties that make it attractive for a variety of electronic applications. Although WTe2 has been studied for decades, its structure and electronic properties have only recently been correctly described. We experimentally and theoretically investigate the structure, dynamics and electronic properties of WTe2, and verify that WTe2 has its minimum energy configuration in a distorted 1T structure (Td structure), which results in metallic-like transport. Our findings unambiguously confirm the metallic nature of WTe2, introduce new information about the Raman modes of Td-WTe2, and demonstrate that Td-WTe2 is readily oxidized via environmental exposure. Finally, these findings confirm that, in its thermodynamically favored Td form, the utilization of WTe2 in electronic device architectures such as field effect transistors may need to be reevaluated.

212 citations