Negative differential resistance in direct bandgap GeSn p-i-n structures

Device model for pulsing in silicon p-i-n structures

We report experimental data and modeling results based on device physics and circuit parameters for the spontaneous firing patterns for silicon p-i-n structures at 4.2 K controlled by a constant current source. The model provides insights into the sensitivity of the pulsing rate and explains the wide range of behavior. observed. The knowledge on the effect of these parameters on pulsing is crit...

A hard oxide semiconductor with a direct and narrow bandgap and switchable p-n electrical conduction.

An oxide semiconductor (perovskite-type Mn2 O3 ) is reported which has a narrow and direct bandgap of 0.45 eV and a high Vickers hardness of 15 GPa. All the known materials with similar electronic band structures (e.g., InSb, PbTe, PbSe, PbS, and InAs) play crucial roles in the semiconductor industry. The perovskite-type Mn2 O3 described is much stronger than the above semiconductors and may fi...

Pseudopotential Calculations of GeSn Pseudopotential calculations of strained-GeSn/SiGeSn hetero-structures

We have obtained empirical pseudopotential parameters for α-Sn and employed the pseudopotential method along with the virtual crystal approximation to model GeSn and SiGeSn alloys. The calculated direct and indirect band gaps of GeSn and SiGeSn show good agreement with experimental data at 300K available till date. The derived pseudopotential parameter set was used to extract various band struc...

Photonic Bandgap Structures

Study of GeSn based heterostructures: towards optimized group IV MQW LEDs.

We present results on CVD growth and electro-optical characterization of Ge(0.92)Sn(0.08)/Ge p-i-n heterostructure diodes. The suitability of Ge as barriers for direct bandgap GeSn active layers in different LED geometries, such as double heterostructures and multi quantum wells is discussed based on electroluminescence data. Theoretical calculations by effective mass and 6 band k∙p method reve...