TLM接触电阻测试与比接触电阻率TLM contact resistance and specific contact resistivity

适合什么需求Suitable projects

TLM用于评估金属与半导体接触，并区分接触贡献和片电阻贡献。在相同宽度、均匀材料与适用的线性模型下，多组间距对应的总电阻可用于拟合接触电阻。[1]TLM evaluates metal–semiconductor contacts and separates contact and sheet-resistance contributions. For equal widths, uniform material and an applicable linear model, resistance measured across multiple gaps supports contact-resistance extraction. [1]

询价前准备哪些资料Quotation inputs

微纳Hub建议提供材料与掺杂信息、完整膜栈、金属层与退火历史、样品尺寸和数量、TLM版图及电极照片。明确各组间距、接触宽度与长度、隔离区域、焊盘尺寸和可探针区域；未制作结构时，将版图与电极加工单列评估。MN Fab Hub recommends supplying material and doping information, layer stack, metallization and annealing history, sample dimensions and count, TLM layout and electrode photographs. Include gaps, contact widths and lengths, isolation, pad dimensions and probe access. Request separate review of layout and contact fabrication if structures are absent.

测试前先检查什么Before measurement

微纳Hub建议先约定温度、偏压范围、电流限制、探针连接与重复测量点位。检查各间距器件的I–V是否适于线性取阻；出现整流、漂移或明显自热时，先记录异常并评估测量条件，不强行输出统一接触电阻。MN Fab Hub recommends agreeing on temperature, bias range, current compliance, probe connections and repeat sites. Check whether each gap supports resistance extraction from a linear I–V region. Record rectification, drift or heating and review conditions before reporting a common contact resistance.

拟合结果与换算边界Fit and conversion limits

在线性TLM的对称接触假设下，总电阻对间距的截距为两个接触电阻之和。Rc的单位是Ω，比接触电阻率ρc的单位是Ω·cm²；电流拥挤与转移长度影响有效接触面积，不能直接用任意几何面积换算。[1] 微纳Hub建议要求报告写明所用模型、尺寸依据和适用条件；负截距应先检查数据与模型。For symmetric contacts in linear TLM, the resistance-versus-gap intercept represents the sum of two contact resistances. Rc is measured in ohms and specific contact resistivity in ohm·cm². Current crowding and transfer length affect effective contact area, so arbitrary geometric-area conversion is invalid. [1] MN Fab Hub recommends documenting the model, dimensions and validity conditions, and investigating negative intercepts.

如何约定验收与下一步Acceptance and next step

微纳Hub建议交付样品编号与版图、实测尺寸依据、各间距原始I–V、取阻区间、拟合点和残差、重复性与异常点处理说明。区分单接触电阻、宽度归一化电阻和比接触电阻率。提交资料后先确认结构可测性及试测方案，再确认周期和报价，不预设通用检出限或精度承诺。MN Fab Hub recommends retaining sample IDs and layout, measured dimension evidence, raw I–V for each gap, extraction ranges, fit points and residuals, repeatability and outlier handling. Distinguish single-contact resistance, width-normalized resistance and specific contact resistivity. Submit inputs for feasibility and pilot review before quotation; no universal detection limit or accuracy is promised.

资料来源References

核查日期：2026-09-24。下列高校课程资料用于原理参考；送样与验收清单为微纳Hub项目沟通建议，不构成设备能力承诺。Checked September 24, 2026. The university reference supports method principles; submission and acceptance lists are MN Fab Hub project guidance, not capability guarantees.

• [1] Georgia Tech — Contact Resistance / Transfer Length Method