Ambipolar performance improvement of the C-shaped pocket TFET with dual metal gate and gate–drain underlap

Abstract

In this paper, dual-metal gate and gate-drain underlap designs are introduced to reduce the ambipolar current of the device based on the C-shaped pocket TFET(CSP-TFET). The effects of gate work function and gate-drain underlap length on the DC characteristics and analog/RF performance of CSP-TFET devices, such as on-state current (I on), ambipolar current (I amb), transconductance (g m), cut-off frequency (f T) and gain-bandwidth product (GBP) are analyzed and compared in this work. And a combination of both the dual-metal gate and gate-drain underlap designs has been proposed for the C-shaped pocket dual metal underlap TFET (CSP-DMUN-TFET), which contains a C-shaped pocket area that significantly increases the on-state current of the device, and this combination design substantially reduces the ambipolar current. The results show that the CSP-DMUN-TFET has excellent performance, including high I on (9.03×10-4 A/μm), high I on/I off (~1011), low SS avg (~13 mV/dec), low I amb (2.15×10-17 A/μm). The CSP-DMUN-TFET has the capability to fully suppress ambipolar currents while maintaining high on-state currents, making it a potential replacement for next generation of semiconductor devices.

Dynamic Surface Reconstruction of Amphoteric Metal (Zn, Al) Doped Cu2O for Efficient Electrochemical CO2 Reduction to C2+ Products

“…These results show that Zn doping leads to more Cu 0 /Cu + interface that is beneficial for the efficient CO 2 conversion to C 2+ products, since Cu 0 activates CO 2 and facilitates the following electron transfers, and Cu + strengthens *CO adsorption to further boost C−C coupling. [22] The previous reports described that ZnO can be thoroughly reduced to metallic Zn under CO2RR condition, [23] however, in our case, most Zn still shows the chemical state of Zn 2+ , attributed to the strong oxidation capacity of the alkaline electrolyte and high local pH. [8] Only small peaks of Zn 0 in Zn 2p (Figure S19, Supporting Information) and Zn LMM Auger spectra (Figure 4c) can be observed.…”

Ceo2/Cus Nanoplates Electroreduce Co2 to Ethanol with Stabilized Cu+ Species

“…At present, in the study of CO 2 reduction to ethanol, the Cu 𝛿+ (0 < 𝛿 < 1) species dynamically formed are considered active sites due to their moderate electron-donating capacity to neutralize positively charged C atoms. [10][11][12] However, in situ formed Cu 𝛿+ is insufficient and easily reduced to Cu 0 so that the energy efficiency and selectivity of Cu-based catalysts for CO 2 reduction to ethanol leaves much to be desired. Accordingly, precisely controlling the local structure of the precatalyst to generate stable and abundant Cu 𝛿+ active sites is beneficial to improve the activity and selectivity of catalysts.…”