%0 Journal Article
%A Kim, Seong Min
%A Ha, J. W.
%A Kwon, J.-H.
%A Jung, J.-H.
%A Bae, J.-H.
%A Kim, H.
%A Kim, J. B.
%D 2015
%I Begell House
%K p - n interface effects, piezoelectric core-shell nanowires, FEM simulation
%N 2
%P 115-121
%R 10.1615/IntJMultCompEng.2015011405
%T NUMERICAL STUDY OF p − n INTERFACE EFFECTS
%U https://www.dl.begellhouse.com/journals/61fd1b191cf7e96f,7132a71b3cf0c1d3,4e9fc151359b20f4.html
%V 13
%X In this study, we simulated piezoelectric enhancements of p − n core-shel nanowires with an inner-core cylinder of n-type ZnO and an outer-shell cylinder of p-type poly-3-hexylthiophene. Compared with conventional n-type ZnO nanowires, the piezoelectric potential of p − n core-shell nanowires with the same dimensions (core part; n-ZnO), calculated by subtracting the electrical potential of the uncompressed core-shell nanowires [φele (Tz = 0)] from that of compressed nanowires (φtotalele) according to φp − npiezo = φtotal
ele − φele (Tz = 0), are enhanced by more than a factor of 10. As the magnitude of vertical external compression (Tz) is varied from 0 to −9×107 N/m2, the piezoelectric potential of the model system increases. This improvement in the piezoelectric potential is attributed to the presence of a depletion zone at the p − n interface (space-charge region), which reduces the carrier screening of the piezoelectric potential by removing free carriers. Our results suggest that the structure proposed here for p − n core-shell nanowires
could improve the performance of photovoltaic systems.
%8 2015-03-06