Influences of unintentionally doped carbon on magnetic properties in Mn-N co-doped ZnO
Date
2011
Authors
Wu, Kongping
Gu, Shulin
Tang, Kun
Zhu, Shunming
Ye, Jiandong
Zhang, Rong
Zheng, Youdou
Journal Title
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Volume Title
Publisher
Elsevier
Abstract
Carbon impurities are usually unintentionally doped in N-doped ZnO when attempting to realize p-type conductivity by metal-organic chemical vapor deposition. Mn-N co-doping technique, which is developed to realize hole-mediated room temperature ferromagnetism in ZnO, may further enhance the carbon incorporation. In this work, two kinds of Mn-N co-doped samples, grown at low temperature (400 °C) and high temperature (600 °C), respectively, have been compared to study the influences of carbon impurities. In contrast to that found on N mono-doped ZnO, an enhanced incorporation of carbon impurities is observed in the high-temperature-grown Mn-N co-doped sample with the conductivity changed from p to n type. According to X-ray photoelectron spectroscopy measurement, the compensation effect from carbon impurities is applied to elucidate the origin of the conductivity transition. Correspondingly, superconducting quantum interference device measurement certainly shows a much smaller value of the saturation magnetization for the high-temperature-grown sample. A possible effect from carbon related complexes on magnetization is also proposed to explain the decrease of the magnetic moment from the view of weakened spin polarization induced by unintentionally incorporated carbon. This assumption is further supported by the first-principle calculation on the Mn-N co-doped ZnO system with carbon incorporation.
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Keywords
Keywords: Carbon impurities; Carbon incorporation; Co-doped; Co-doped ZnO; Co-doping; Compensation effects; Diluted magnetic semiconductors; Doped carbons; Doped ZnO; First principle calculations; High temperature; Low temperatures; Metal-organic chemical vapor dep Diluted magnetic semiconductor; Impurity; Metal-organic chemical vapor deposition; Unintentionally doped carbon; Zinc oxide
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Source
Thin Solid Films
Type
Journal article
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2037-12-31
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