I know about abrupt and graded heterojunctions and have read about metallurgical junctions but I have not seen a good example of a metallurgical heterojunction. For example, how can one explain a metallurgical heterojunction using CIGS/In2S3 hetero-structure?
It's the junction before diffusion, ie, the physical junction.
As I understand, a metallurgical junction is one where if one were to travel from one material to another, atoms/molecules of one material end and those of the other start to appear. It is a physical junction as opposed to an electrical junction, a location/region where the carrier concentrations of electrons and holes are equal and the materials are both doped i.e not instrinsic.
but what i know metallurgical junction is physical but opposed to the traditional flow of charge..Heterojunction Bipolar Transistors allow one to obtain an emitter efficiency very close to unity even when using a heavily doped base. Moreover the symmetric Double Heterojunction Bipolar Transistor (DHBT) is of interest for I2L and ECL digital circuits. Nevertheless the coincidence between the metallurgical heterojunction and the electrical junction leads to large Generation-Recombination currents in the Space Charge Layers (SCL) and the spikes restrict both the electron injection from the emitter and the electron collection at the collector /1/. These effects have been avoided by introducing gradual heterojunctions or thin n type layers (spacers) at the emitter-base and collector-base junctions /2–4/. In this paper the influence of spacers on the transistor characteristics will be reported and the results will be interpreted using Monte-Carlo simulations.
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