提升氣膠沉積法製作之鋯鈦酸鉛(PZT)微型壓電能量擷取器元件效能之研究與實作

Performance improvement of PZT micro piezoelectric energy harvester fabricated by Aerosol deposition method

10.6342/NTU201704068

林莛凱

鋯鈦酸鉛 ； 壓電材料 ； 氣膠沉積法 ； 能量擷取 ； 微機電製程 ； PZT ； piezoelectric material ； aerosol deposition ； energy harvester ； MEMS

國立臺灣大學工程科學及海洋工程學系學位論文

2017年

碩士

吳文中

繁體中文

隨著物聯網的概念逐漸普及，在物聯網中不可獲缺的低功耗感測器需求也快速的增加，然而這些感測器如果使用電線供電有安裝的不方便以及隨著距離增加的成本問題，以電池做為能量供給的手段又會有環保疑慮和維護的不便，為最大化低功耗感測器的適用範圍與增加使用年限，近期研究逐漸轉向發展"自供電技術"，意即將環境所潛藏的各式能量轉換為電能並供應後端裝置使用，希望以此技術解決上述問題。 本篇論文建立在振動能量擷取技術，原理為透過擷取環境中的振動能量轉化為電能供給後端應用，此技術相比目前普遍應用的太陽能能量擷取發電，其優勢為在室內或無光的環境下此裝置亦能持續供應電力，並且擁有極高的能量密度可供使用。本論文使用機械-電能轉換效率最高的壓電材料做能量擷取元件，並以在市面上擁有良好的壓電特性被普遍應用的鋯鈦酸鉛(PZT)做為研究之基礎，製作出懸臂樑結構的壓電能量擷取器、提供複合材料之懸臂樑靜力模型，計算出壓電常數值d31，以克服薄膜壓電元件在量測d31時所遇到的困難。同時改進本團隊的氣膠沉積製程，輔以後續的優化退火與極化參數，使氣膠沉積製成之壓電薄膜的壓電特性可以再一步提升。在使用結合上述研究以微機電製程完成的壓電能量擷取元件，其在0.5g的共振頻下可以達到300μw以上的輸出表現，其單位體積能量密度的表現遠高於過去所有本團隊所製成的能量擷取器，達到接近實際應用的階段。 關鍵字：鋯鈦酸鉛、壓電材料、氣膠沉積法、能量擷取、微機電製程

For past years the idea of "Internet of Things(IoT)" has become more expanding, which makes the demand of low power consumption sensors increased rapidly. In generally we use power lines or battery to drive these sensors. However, powering the sensors in remote areas with power lines is costly no matter in installation or maintenance. On the other hand, using battery can solve the problems, but the maintenance issue and risk of environmental pollution will emerge. Summing up the above reasons, scavenging energy from varying ambient energy sources and transferring them into electricity to drive the end devices, or called "Self-powered technology", seems to be a better solution to completely solve the problems, maximize the application scope and lifetime for IoT sensors. This thesis is based on scavenging the environmental vibration energy. Comparing to solar power, vibration energy is capable to provide energy no matter indoor or not. The power density of ambient vibration is also high enough to be exploited due to the past researches. By utilizing the piezoelectric material PZT we successfully fabricated cantilever structure piezoelectric energy harvester. A static force analysis for cantilever structure to evaluate effective piezoelectric constant d31 of thin film piezoelectric material is also presented. Combining the study for improving Aerosol deposition method (ADM) efficiency, the optimization of annealing and poling process, and metal micro electro-mechanical system (MEMS) process, we accomplished the stainless-based cantilever structure piezoelectric energy harvesters. The output performance could reach more than 300μW at 0.5g resonant frequency. The power density was better than all studies made before. The results show that our device is very close to practical application. Keyword: PZT, piezoelectric material, aerosol deposition, energy harvester, MEMS

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