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Thermodynamic considerations on interfacial reactivity concerning carrier transport characteristics in metal/p-Zn3P2 junctions

Abstract

Carrier transport across metal/semiconductor interface plays a key role in electronic devices. It is generally affected by some interactions at interfaces such as atomic interdiffusion and formation of intermediate compounds, however, it is hard to consider all possible chemical reactions at the interface. In this work, we adopted chemical potential diagram for comprehensive discussions on chemical reactions at the interfaces between metal (M) and p-type zinc phosphide (p-Zn3P2) which is a promising candidate as an absorber in thin-film solar cells. We revealed that Schottky or Ohmic behavior depended on the reaction at the interfaces through the investigations in Al/p-Zn3P2 and Ag/p-Zn3P2 junctions. The interdiffusion was observed at the interface of Al/p-Zn3P2, while the interfacial structure in Ag/p-Zn3P2 was not changed by annealing. Such behaviors were thermodynamically expected from the chemical potential diagrams and determined the transport characteristics considering the similar work functions of Al and Ag. Furthermore, the discussions on other M-P-Zn (M = Au, In, Mn, Cu) systems based on chemical potential diagram clarified that phosphide semiconductors as intermediate compounds were formed in the M/p-Zn3P2 junctions, which show Schottky behavior, and that Ohmic M/p-Zn3P2 junctions are stable. Therefore, it is concluded that we should discuss the band structures in heterojunctions under the considerations on the reactivity at the interfaces, which were comprehensively understood using chemical potential diagrams.

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Publication details

The article was received on 11 Mar 2017, accepted on 14 May 2017 and first published on 16 May 2017


Article type: Paper
DOI: 10.1039/C7TC01047H
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Thermodynamic considerations on interfacial reactivity concerning carrier transport characteristics in metal/p-Zn3P2 junctions

    R. Katsube and Y. Nose, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01047H

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