Thermoelectric thermal detectors based on ultra-thin heavily doped single-crystal silicon membranes

Aapo Varpula, Andrey Timofeev, Andrey Shchepetov, Kestutis Grigoras, Juha; Hassel, Jouni Ahopelto, Markku Ylilammi, Mika Prunnila

    Research output: Contribution to journalArticleScientificpeer-review

    15 Citations (Scopus)

    Abstract

    We present thermal detectors based on 40?nm-thick strain tuned single crystalline silicon membranes shaped into a heater area supported by narrow n- and p-doped beams, which also operate as a thermocouple. The electro-thermal characterization of the devices reveals a noise equivalent power of 13 pW/Hz1/2 and a thermal time constant of 2.5?ms. The high sensitivity of the devices is due to the high Seebeck coefficient of 0.39?mV/K and reduction of thermal conductivity of the Si beams from the bulk value. The performance enables fast and sensitive detection of low levels of thermal power and infrared radiation at room temperature. The devices operate in the Johnson-Nyquist noise limit of the thermocouple, and the performance improvement towards the operation close to the temperature fluctuation limit is discussed.
    Original languageEnglish
    Article number262101
    JournalApplied Physics Letters
    Volume110
    Issue number26
    DOIs
    Publication statusPublished - 26 Jun 2017
    MoE publication typeA1 Journal article-refereed

    Keywords

    • thermocouples
    • silicon
    • thermal noise
    • thermoelectric devices
    • nanomembrane
    • OtaNano

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