%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 eleφele (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