Thermal Response and TC f of GaN/AlN Heterostructure Multimode Micro String Resonators From −10 °C Up to 325 °C

Thermal Response and TC f of GaN/AlN Heterostructure Multimode Micro String Resonators From −10 °C Up to 325 °C
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GaN/AlN 异质结构多模微弦谐振器在 −10 °C 至 325 °C 范围内的热响应和 TC f

DOI:
10.1109/jmems.2021.3089703
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发表时间:
2021
影响因子:
2.7
通讯作者:
P. Feng
P. Feng
中科院分区:
工程技术3区
文献类型:
--
作者:
Wen Sui;Xu;Ji;B. Alphenaar;P. Feng

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我们首次报道了共振频率的热响应和温度系数的实验表征和分析(TC<Inline-Formal><Tex-Math Notation=“LaTeX”>$f$</Tex-Math></Inline-Formal>氮化镓/氮化铝(GaN/AlN)异质结构微弦谐振器,温度范围从−10°C到325°C,由于其优异的电气和机械性能以及化学惰性,近年来引起了人们对GaN微电子机械系统在新兴的大功率、高温和恶劣环境应用的日益增长的兴趣。硅片上的GaN薄膜通常需要AlN缓冲层,因此GaN外延层和GaN/AlN异质层中的残余拉应力分布对MEMS的性能和性能有很大的影响。在这里,我们设计并制作了GaN/AlN异质结构微串谐振器,其长度为<内嵌公式><tex-matic notation=“LaTeX”>$L=100$</tex-mah&>;<,200和300<内嵌-公式&>200和300<,以探索应力和热效应对共振行为的影响。所有离面弯曲模式都表现出明显的弦行为,多模共振频率随着温度的升高几乎呈线性下移,最高可达325°C。GaN/AlN异质结谐振腔的线性温度依赖关系和TC<内联公式>$f$</tex-ath>/内联公式>值可直接用于热敏。不同设备之间的比较表明,较高的拉伸应力水平有助于较小的TC<串联公式>$f$</tex数学>/串联公式>值,这表明可以利用应变工程来有意地调节TC<串联公式>;tex-数学符号=“laex”>$f$</tex-数学></串联公式>
We report on the first experimental characterization and analysis of the thermal response and temperature coefficient of resonance frequency (TC<inline-formula> <tex-math notation="LaTeX">$f$ </tex-math></inline-formula>) of gallium nitride/aluminum nitride (GaN/AlN) heterostructure micro string resonators, in a wide temperature range from −10 °C up to 325 °C. Thanks to its excellent electrical and mechanical properties and chemical inertness, GaN has recently stimulated growing interests in GaN microelectromechanical systems (MEMS) for emerging high-power, high-temperature, and harsh-environment applications. GaN films on Si wafers often require AlN buffer layers, thus the residual tensile stress profile in the GaN epilayers and GaN/AlN hetero-layers can play a key role in affecting the MEMS specifications and performance. Here we design and fabricate GaN/AlN heterostructure micro string resonators with length <inline-formula> <tex-math notation="LaTeX">$L = 100$ </tex-math></inline-formula>, 200 and 300 <inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> to probe the stress and thermal effects on resonance behavior. All out-of-plane flexural modes show clear string behavior, and the multimode resonance frequencies downshift almost linearly with increasing temperature up to 325 °C. The linear temperature dependence and TC<inline-formula> <tex-math notation="LaTeX">$f$ </tex-math></inline-formula> values of GaN/AlN heterostructure resonators can be directly employed for thermal sensing. Comparison among different devices indicates that higher tensile stress levels contribute to smaller TC<inline-formula> <tex-math notation="LaTeX">$f$ </tex-math></inline-formula> values, suggesting strain engineering may be exploited for intentionally regulating the TC<inline-formula> <tex-math notation="LaTeX">$f$ </tex-math></inline-formula>.