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Unusually Large Thermopower Change from +330 to −185 μV K–1 of Brownmillerite SrCoO2.5
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-07-06 , DOI: 10.1021/acsaelm.0c00427 Qian Yang 1 , Joonhyuk Lee 2 , Bin Feng 3 , Yuichi Ikuhara 3 , Gowoon Kim 1 , Hai Jun Cho 4 , Hyoungjeen Jeen 2 , Hiromichi Ohta 4
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-07-06 , DOI: 10.1021/acsaelm.0c00427 Qian Yang 1 , Joonhyuk Lee 2 , Bin Feng 3 , Yuichi Ikuhara 3 , Gowoon Kim 1 , Hai Jun Cho 4 , Hyoungjeen Jeen 2 , Hiromichi Ohta 4
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Strontium cobalt oxide (SrCoO2.5) has recently attracted increasing attention as its optoelectronic and magnetic properties can be widely controlled using electrochemical oxidation/protonation at room temperature in air. To utilize the versatile properties of SrCoO2.5, it is essential to evaluate the location of the Fermi energy (EF) in the electronic structure, which is sensitive to the oxidation state of the Co ions. Here, we show that thermopower is an excellent measure for analyzing the EF in SrCoO2.5 epitaxial films. The lattice mismatch causes grain size reduction, which induces a slight increase in the oxidation state of the Co ions due to additional adsorbed oxygen. Although X-ray spectroscopy analyses reveal that the difference of the oxidation state of the Co ions among the samples is small, an unusually large change in thermopower from +330 μV K–1 (lattice-matched) to −185 μV K–1 (lattice-mismatched) is observed in the samples due to shifts in the EF to the lower energy side. The present results demonstrate the excellent sensitivity of thermopower measurements for analyzing the location of EF in the electronic structure of SrCoO2.5 in a practically usable environment.
中文翻译：
Brownmillerite SrCoO 2.5从+330到−185μVK –1的异常大的热功率变化
氧化锶钴（SrCoO 2.5）最近受到越来越多的关注，因为其光电子和磁性可以在室温下在空气中使用电化学氧化/质子化来广泛控制。为了利用SrCoO 2.5的通用特性，必须评估费米能量（E F）在电子结构中的位置，该位置对Co离子的氧化态敏感。在这里，我们表明，热电是分析SrCoO 2.5中E F的极好方法外延膜。晶格失配导致晶粒尺寸减小，这由于额外的吸附氧而导致Co离子的氧化态略有增加。尽管X射线光谱分析表明样品中Co离子的氧化态差异很小，但热功率却从+330μVK –1（晶格匹配）到−185μVK –1（由于E F向低能级移动，在样品中观察到晶格不匹配）。目前的结果表明，在实际可用的环境中，热功率测量在分析SrCoO 2.5电子结构中E F的位置方面具有出色的灵敏度。
更新日期：2020-07-28
中文翻译：
Brownmillerite SrCoO 2.5从+330到−185μVK –1的异常大的热功率变化
氧化锶钴（SrCoO 2.5）最近受到越来越多的关注，因为其光电子和磁性可以在室温下在空气中使用电化学氧化/质子化来广泛控制。为了利用SrCoO 2.5的通用特性，必须评估费米能量（E F）在电子结构中的位置，该位置对Co离子的氧化态敏感。在这里，我们表明，热电是分析SrCoO 2.5中E F的极好方法外延膜。晶格失配导致晶粒尺寸减小，这由于额外的吸附氧而导致Co离子的氧化态略有增加。尽管X射线光谱分析表明样品中Co离子的氧化态差异很小，但热功率却从+330μVK –1（晶格匹配）到−185μVK –1（由于E F向低能级移动，在样品中观察到晶格不匹配）。目前的结果表明，在实际可用的环境中，热功率测量在分析SrCoO 2.5电子结构中E F的位置方面具有出色的灵敏度。
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