silvaco simulation

The operation of hetero In0.49Ga0.51P–Al0.7Ga0.3As tunnel diodes has been evaluated, and an approach for optimizing the back surface field (BSF) layer of a InGaP/GaAs dual-junction (DJ) solar cell developed. The results show that the hetero In0.49Ga0.51P–Al0.7Ga0.3As tunnel diode transferred more electrons and holes and showed less recombination between the top and bottom cells with increased efficiency (g) in the InGaP/GaAs DJ solar cell. To achieve higher open-circuit voltage (Voc), GaAs semiconductor was investigated to match with Al0.52In0.48P with bandgap of 2.4 eV, and replacement of the bottom cell in the InGaP/GaAs DJ solar cell with such an Al0.52In0.48P–GaAs heterojunction increased the photogeneration in this region. In the next step, addition of a BSF layer to the top cell required two BSF layers in the bottom cell to optimize the short-circuit current (Jsc) and g. The thickness and doping of the BSF layers were increased to obtain the highest g for the cell. The proposed structure was then compared with previous works. The proposed structure yielded Voc = 2.46 V, Jsc = 30 mA/cm2, fill factor (FF) = 88.61%, and n = 65.51% under AM1.5 (1 sun) illumination.

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Abstract - The effects of doping on the performance of coaxially gated carbon nanotube (CNT) field-effect transistors for both zero Schottky-barrier (SB) and doped carbon nanotube contacts are theoretically investigated. For ultrascaled CNTFETs in which the source/drain metal contacts lie 50 nm apart, there is no MOSFET-like contact CNTFET (C-CNTFET) with an acceptable on/off current ratio using a CNT of diameter >= 1.5 nm and a source/drain voltage >= 0.4 V. For CNTFETs with source/drain metal contacts either 50 nm or 100 nm apart, there is an optimal doping concentration of 1e-3 dopants per atom. The maximum on/off current ratios for the 50 nm CNT/5 nm gate and the 100 nm CNT/10 nm gate SB-CNTFETs are 5e4 and 6e5, respectively. Performance metrics of delay time, cutoff frequency, and LC frequency are presented and compared.