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International Journal for Multiscale Computational Engineering
Импакт фактор: 1.016 5-летний Импакт фактор: 1.194 SJR: 0.452 SNIP: 0.68 CiteScore™: 1.18

ISSN Печать: 1543-1649
ISSN Онлайн: 1940-4352

Выпуски:
Том 17, 2019 Том 16, 2018 Том 15, 2017 Том 14, 2016 Том 13, 2015 Том 12, 2014 Том 11, 2013 Том 10, 2012 Том 9, 2011 Том 8, 2010 Том 7, 2009 Том 6, 2008 Том 5, 2007 Том 4, 2006 Том 3, 2005 Том 2, 2004 Том 1, 2003

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2015011405
pages 115-121

NUMERICAL STUDY OF p − n INTERFACE EFFECTS

Seong Min Kim
The Office of Computational Energy Science, Maetan 3-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-373, Korea; CAE, Platform Technology Lab, Samsung Advanced Institute of Technology, Suwon-si, Gyeonggi-do, 443-803, Korea
J. W. Ha
Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
J.-H. Kwon
School of Electronics Engineering, Kyungpook National University, Daegu, Republic of Korea
J.-H. Jung
School of Electronics Engineering, Kyungpook National University, Daegu, Republic of Korea
J.-H. Bae
School of Electronics Engineering, Kyungpook National University, Daegu, Republic of Korea
H. Kim
Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea
J. B. Kim
Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea

Краткое описание

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.


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