门控
材料科学
氧化还原
调制(音乐)
载流子密度
格子(音乐)
电荷密度
载流子
凝聚态物理
光电子学
物理
兴奋剂
生物物理学
量子力学
声学
冶金
生物
作者
Hui Cao,Changjiang Liu,Dillon D. Fong,Anand Bhattacharya,Matthew Tirrell,Hua Zhou,Wei Chen
摘要
Redox gating involves the use of reversible redox functionalities combined with ionic electrolytes to substantially alter the charge carrier density in functional condensed materials. This modification leads to the emergence of physical properties not observed in the original material. In our study, we focus on redox gating applied to a LaNiO3 (001) film within a field-effect device and identify a critical gate voltage of 0.7 V. Hall measurements indicate that redox gating markedly increases the charge carrier density in LaNiO3, reaching over 1014 cm−2. This increase is primarily due to the injection of electrons into LaNiO3, which offsets the existing hole carriers. These adjustments in the carrier concentration result in reversible lattice expansion in LaNiO3 when gate voltages are below 0.7 V. This expansion correlates well with theoretical models that consider adjustments to the Ni–O bond length, influenced by oxygen ligand holes. Conversely, at gate voltages above 0.7 V, there are significant changes in resistivity, lattice structure, and Ni valence, stemming from the formation of oxygen vacancies in the LaNiO3 film.
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