Methodology of teasting thermoelectric properties of low-dimensional nanomaterials

Wei Jiang-Tao; Yang Liang-Liang; Qin Yuan-Hao; Song Pei-Shuai; Zhang Ming-Liang; Yang Fu-Hua; Wang Xiao-Dong

doi:10.7498/aps.70.20201175

Abstract

Through the research in recent decades, one has a comprehensive understanding of the thermoelectric properties of bulk and thin film materials, and made rapid progress of improving the thermoelectric figure of merit ZT, for instance, the maximum ZT values of bismuth telluride related materials, cuprous selenide related materials and tin selenide related materials all exceed 2. However, these bulk materials are still far from the requirements for their practical applications on a large scale. The theoretical calculations show that when bulk thermoelectric materials are made a low-dimensional nanostructured materials, such as two-dimensional nano-films and one-dimensional nanowires, their thermoelectric properties will be significantly improved. Taking silicon for example, when the bulk silicon is made silicon nanowires, the ZT value increases nearly a hundredfold. Hence, researches of the thermoelectric performances of materials with micro-nano structures have received great attention. However, the measurement of thermoelectric parameters of low-dimensional materials has brought challenges to researchers, for the traditional measurement methods or test platforms designed for bulk materials are no longer suitable for measuring thermoelectric parameters (thermal conductivity, electrical conductivity and Seebeck coefficient) of low-dimensional materials. Therefore, new measurement methods and test platforms need developing. In this case, micro-electromechanical system micro-suspended structure came into being. In this approach used are the separated samples and substrates, and isolated heat transfer channels, with which the thermal parameters of micro/nano materials can be accurately measured, and the sensitivity of thermal conductance can reach 10 PW/K. In this review, the structures of several micro-electromechanical systems used to measure the thermoelectric properties of low-dimensional nanostructures are introduced, including double suspended islands, single suspended islands and suspended four-probe structures. Meanwhile, the fabrication methods and measurement principles of these MEMS structures and thermoelectric properties of micro-nano structure materials are described in detail.

Keywords:

thermoelectric effects /
nanomaterials /
micro-electromechanical system structure /
thermal conductivity

Authors and contacts

1.
Engineering Research Center for Semiconductor Integrated Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
2.
College of Microelectronics and Research Center of Materials and Optoelectronics, University of Chinese Academy of Sciences, Beijing 100049, China
3.
Beijing Institute of Quantum Information Science, Beijing 100193, China
4.
Beijing Semiconductor Micro/Nano Integrated Engineering Technology Research Center, Beijing 100083, China

Corresponding author: Wang Xiao-Dong, xdwang@semi.ac.cn

Funds: Project supported by the National Key Research and Development Program of China (Grant Nos. 2019YFB1503602, 2018YFB1107502), the Pilot B Program of the Chinese Academy of Sciences, China (Grant No. XDB43020500), and Development Program of Scientific Research Instruments and Equipment of the Chinese Academy of Sciences, China (Grant No. GJJSTD20200006)

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Cited By

图 1 块体材料的测量原理图

Figure 1. Measurement schematic diagram of bulk materials.

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图 2 (a) MEMS悬空岛结构热电参数测量原理图^[37]; (b) 固定在微悬空结构上的ITO纳米线^[38]

Figure 2. (a) Schematic diagram of thermal and electrical parameters measurement of MEMS suspended island structure^[37]; (b) ITO nanowires fixed on the suspended structure^[38].

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图 3 (a) 用于测量低温端电阻R_s的惠斯通电桥装置^[42]; (b) 加热端和低温端测得的温升与功率的函数关系;电桥法的T_s灵敏度为1 mK, 热导的测量灵度可以达到10 pW/K^[42]

Figure 3. (a) Wheatstone bridge device for measuring resistance R_s at low temperature end^[42]; (b) the temperature rise measured at the heating end and the low temperature end as a function of power. T_s sensitivity of bridge method is1 mK, thermal conductance sensitivity is 10 pW/K^[42].

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图 4 集成微器件示意图^[43]　(a) 硅微带连接两个悬空岛(30 µm × 40 µm), 用于与低应力SiN_x薄膜进行热接触. 定义了硅带的长度, 宽度和厚度; (b) 每个悬空岛有6条低应力SiN_x悬臂相连, 用来支撑微悬浮器件; (c) 通过四探针进行电测量; (Cr/Pt = 2/30 nm, 由蓝色箭头标记). 其余的悬臂用来测量两个蛇形电阻; (d) 多孔硅微带悬空器件. 纳米孔是通过BCP光刻制造的; (e) 多孔硅微带中孔间距和孔颈的定义示意图

Figure 4. Schematic of the integrated microdevice^[43]: (a) Silicon micro-ribbon connects two suspended islands(30 µm × 40 µm)for thermal contact with low stress SiN_x films, length, width and thickness of silicon tape are defined; (b) each suspended island is connected by six low stress SiN_x cantilevers to support micro suspended device; (c) electrical measurements are made with four probes (Cr/Pt = 2/30 nm, marked by the blue arrows), the rest of the cantilevers are used to measure two serpentine resistances; (d) porous silicon micro-ribbon suspended device, nanoholes are made by BCP lithography; (e) definition of pitch and neck in porous silicon micro-ribbon.

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图 5 基于嵌段共聚物纳米光刻的7个步骤的工艺流程图^[43]

Figure 5. Process flow diagram illustrating the 7 steps of the block copolymer based nanolithography^[43].

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图 6 扫描电子显微镜 (SEM) 图像　(a) 纳米带 (470 nm宽, 80 nm厚)^[50] (b) 蛇形纳米带 (470 nm宽, 80 nm厚, 狭缝长395 nm)^[50]; (c) 梯状结构纳米带, 矩形孔间距为970 nm^[51]; (d) 梯状结构纳米带, 矩形孔间距为70 nm^[51]

Figure 6. Scanning electron microscopy (SEM) images: (a) Nanoribbon (470 nm wide, 80 nm thick)^[50]; (b) serpentine nanoribbon (470 nm wide, 80 nm thick, 395 nm long slit)^[50]; (c) ladder-structured nanoribbon with rectangular hole of 970 nm^[51]; (d) ladder-structured nanoribbon with rectangular hole of 70 nm^[51].

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图 7 (a) MEMS悬空结构热电参数测量原理图^[68]; (b) 普通薄膜和声子晶体薄膜低温端和高温端温度差和加热功率的关系, 其中插图为声子晶体热导率与温差ΔT的关系^[68]

Figure 7. (a) Schematic diagram of MEMS suspended structure thermoelectric parameter measurement^[68]; (b) the relation between the temperature difference and heating power between the low temperature end and the high temperature end of the plain film and the phononic crystal film is shown in the figure. Inset plot presents the relation between κ of the phononic crystal and the temperature difference ΔT^[68].

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图 8 集成声子晶体悬浮硅薄膜热导率测量平台的制作顺序. 在加工的每个步骤之后, 均使用照片中沿A-A'和B-B'切割线的横截面图显示了工艺流程. 最左边的SEM图显示了整个微悬空设备, 中间的SEM图显示了放大的薄膜, 最右边的SEM图显示了声子晶体, 并突出了它们的维度^[68]

Figure 8. Manufacturing sequence of thermal conductivity measurement platform of suspended thin-film silicon with integrated phononic crystals. Process flow showed after each step of fabrication using cross-sectional view along A-A’ and B-B’ cutlines presented in the photo. The leftmost SEM image showed the entire micro-suspension device, the middle SEM image showed the enlarged film, the rightmost SEM image showed the phononic crystals and highlighted their dimensions^[68].

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图 9 (a) 不同宽度的纳米线的实验 (散点) 和模拟拟合 (线)^[71]; (b) 基于超快脉冲激光系统的TDTR实验装置示意图^[72]

Figure 9. (a) Experimental (scattered points) and simulation fitting (lines) for three nanowires of different width^[71]; (b) sketch of the TDTR experimental setup based on an ultrafast-pulsed-laser system^[72].

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图 10 Si声子晶体纳米结构的SEM照片 (a) 悬浮结构的全局图像^[71]; (b) 放大的器件结构图, 显示了中心金属垫和鱼骨形状的晶体, 其中颈部尺寸为89 nm^[71]

Figure 10. SEM images of Si phononic crystal nanostructure: (a) Global image of suspended structure^[71]; (b) enlarged device structure diagram showing the central metal pad and fishbone shaped crystal, where in the neck size is 89 nm^[71].

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图 11 (a) 悬挂在微桥装置中央框架上的h-BN样品的相关尺寸的示意图^[73]; (b)微悬浮结构的SEM图, 悬浮结构上的样品为h-BN1^[73]; (c) 两个7.5 μm长, 11层和5层厚悬浮h-BN样品的导热系数随温度的变化关系, 并与其他人的实验结果进行了对比^[73]

Figure 11. (a) Schematic diagram of the relevant dimensions of the h-BN sample suspended on the central frame of the microbridge device^[73]; (b) SEM image of micro-suspension structure, the sample on suspension structure was h-BN1^[73]; (c) the relationship between the thermal conductivity of two samples of 7.5 μm long, 11 layer and 5 layer thick suspension h-BN and the temperature is studied and compared with the experimental results of others^[73].

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图 12 样品h-BN的转移和器件图^[73]　(a) 在被热氧化物 (红色) 覆盖的硅衬底 (灰色) 顶部剥落的几层h-BN薄片 (绿色); (b) 基底上的金标记 (金色) 和覆盖有图案的几层h-BN带的PMMA层 (半透明); (c) 转移到微桥设备顶部的PMMA载体层 (蓝色); (d)PMMA层溶解后, 少量h-BN层悬浮在微器件的中心SiN_x框架上; (e) 微桥设备; (f) 在设备上对齐PMMA层; (g)溶解PMMA层后悬浮在装置上的11层h-BN样品; (h) 测量装置的等效热电路, (e)−(g)部分中刻度条分别代表25, 10和5 μm

Figure 12. The h-BN sample transfer and device diagram^[73]: (a) A few-layer h-BN flake (green) exfoliated on top of a Si substrate (gray) covered by thermal oxide (red); (b) Au marks (golden) on the substrate and a PMMA layer (semitransparent) covering the patterned few-layer h-BN ribbon; (c) PMMA carrier layer transferred on top of the microbridge device (blue); (d) few-layer h-BN suspended on the central SiNx frame of the microdevice after the dissolution of the PMMA layer; (e) microbridge device; (f) PMMA layer aligned on the device; (g) an 11-layer h-BN sample suspended on the device after dissolving of the PMMA layer; (h) equivalent thermal circuit of the measurement device, the scale bars in the (e)−(g) section represent 25, 10 and 5 μm, respectively.

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图 13 器件的结构图和等效热阻图^[75]　(a) 240 nm宽, 220 nm厚的硅纳米线样品的光学显微照片 (左边) 和SEM照片 (右边), 如顶部SEM所示, 在从左侧开始的第一条温度计线的中心形成一个小的V形突起, 以帮助测量每个温度计线的中心和纳米结构的接触点之间的偏差 (d_i和d_j); (b)740 nm宽, 220 nm厚的硅纳米线样品的光学显微照片, 装配在4条悬浮的Pt/SiN_x线上, 以及沿着Pt/SiN_x加热线 (第i条线) 和一条Pt/SiN_x电阻温度计线 (第j条线, j ≠ i) 的温度分布示意图; (c) 当第一条Pt/SiN_x线以 (IV)₁的速率电加热时, 测量装置的热阻电路图

Figure 13. Structure diagram and equivalent thermal resistance diagram of the device^[75]:　(a) Optical micrographs (left) and SEM images (right) of a 240 nm wide, 220 nm thick silicon nanowire sample, as shown in the top SEM, a small V-shape protrusion is patterned at the center of the first thermometer line from the left to assist in the measurement of the deviation (d_i and d_j) between the center of each thermometer line and the contact point to the nanostructure; (b) optical micrograph of 740 nm wide and 220 nm thick silicon nanowire samples, assembled on four suspended Pt/SiN_x lines, and schematic diagram of temperature distribution along the Pt/SiN_x heating line (i^th line) and one Pt/SiN_x resistance thermometer line (j^th line, j ≠ i); (c) thermal resistance circuit of the measurement device when the first Pt/SiN_x line is electrically heated at a rate of (IV)₁.

DownLoad: Full-Size Img PowerPoint

图 14 (a) 第一次Pt—C键合之后的SEM图^[45]; (b)第二次Pt-C键合之后的SEM图^[45]

Figure 14. (a) SEM image after the first Pt—C bonding^[45]; (b) SEM image after the second Pt—C bonding^[45].

DownLoad: Full-Size Img PowerPoint

表 1 测量的悬浮h-BN样品的尺寸

Table 1. Measurement of the size of suspended h-BN samples.

原子层数宽度/µm 悬浮的长度/µm

h-BN1 12 ± 1 9.0 3.0
h-BN2 12 6.7 5.0
h-BN3 11 6.5 7.5
h-BN4 5 6.6 7.5

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