藉由與全碘無機鈣鈦礦奈米棒形成異質接面及利用奈米金粒子局域表面電漿子效應增益全溴無機鈣鈦礦奈米晶之光偵測元件性能

Enhanced Performances of Photodetector Based on CsPbBr3 Nanocrystals by Forming Heterojunction with CsPbI3 Nanorods and Utilizing Localized Surface Plasmonic Effect of Gold Nanoparticles

蕭郁鈞(Yu-Chun Hsiao)

指導教授 ： 陳力俊

國立清華大學/工學院/材料科學工程學系/碩士(2020年)

摘要

近年來隨著科技的發展，許多劃時代的發明像是無人機、自動駕駛系統及互動式機器人已經對我們的日常生活造成了很大的影響。而上述的這些科技都包含著一個基本但不可或缺的元件:光偵測器。因此，在元件這領域中，光偵測器必定在未來會占有一席之地。目前，無機鹵素鈣鈦礦材料吸引了許多的關注因為他們擁有著令人興奮的潛能來應用在光電元件上。無機鹵素鈣鈦礦材料有許多優異的性質，像是載子遷移率高、擴散路徑長、在可見光波段的吸收率高及吸收光波段與貴金屬的局域表面電漿子共振波長吻合，而這些優勢也使他們成為理想的材料應用在光偵測器上。在本論文中將會探討利用奈米金顆粒局域表面電漿子共振來增益無機鹵素鈣鈦礦材料中的全溴無機鹵素鈣鈦礦米晶體和全碘無機鹵素鈣鈦礦奈米棒形成的異質結構光偵測器的元件性能表現。在形成異質結構和經過局域表面電漿子增益後，局域表面電漿子增益的全溴無機鹵素鈣鈦礦米晶體/全碘無機鹵素鈣鈦礦奈米棒異質結構光偵測器的偵測率、響應度及電流開關比可達1.93 × 1010 Jones、9.71 × 10-4 A/W和1230。
本論文主要分為五章節，第一章是簡介，其內容涵蓋奈米科技的介紹、光偵測器的工作原理、局域表面電漿子共振效應和無機鹵素鈣鈦礦材料的性質。第二章為實驗部分包含實驗步驟及實驗所需之儀器介紹。第三章則為研究數據之結果與討論，在此章節中含有無機鹵素鈣鈦礦的材料分析、元件分析及元件的光電特性量測。第四章為第三章研究結果的總結和結論。最後，第五章則是此研究未來的發展性。

關鍵字

光偵測器 ； 鈣鈦礦 ； 局域表面電漿子 ； 量子點 ； 奈米材料 ； 異質接面

並列摘要

Recently, the cutting-edge technology such as drone, self-driving automobile and robotic have caused a great impact to our daily life. These applications all contain a basic but indispensable component, photodetectors, which act as the bridge connecting the machine to the environment. Hence, the development of a photodetector with high performances is an important issue in the future. Currently, all-inorganic perovskite materials CsPbX3 (X = Cl, Br and I) have attracted a great deal of attentions due to their exciting and promising applications in optoelectronic devices. All-inorganic perovskite materials have the merits of high carrier mobility, long carrier diffusion length, excellent visible light absorption and well overlapping with localized surface plasmon resonance of noble metal nanostructures which make them become the ideal candidates for the photodetectors. Herein, the photodetectors based on CsPbBr3 nanocrystals are designed to form a heterostructure with CsPbI3 nanorods and utilize localized surface plasmon resonance of Au nanoparticles to enhance the device performances. After the formation of heterojunction and localized surface plasmonic enhancement, the detectivity, responsivity and on-off ratio of the Au-CsPbBr3 nanocrystals/CsPbI3 nanorods photodetectors can attain the value of 1.93 × 1010 Jones, 9.71 × 10-4 A/W and 1230, respectively.
In this thesis, five main chapters are presented. The introduction of nanotechnology, mechanisms of photodetector, localized surface plasmon resonance and properties of all-inorganic perovskite materials are discussed in chapter 1. The experimental procedures and experimental equipment are included in chapter 2. The experimental results including the characterization of the perovskite materials and device measurements are discussed in chapter 3. The experimental results are summarized in chapter 4. Finally, the future prospects of this research are discussed in chapter 5.

並列關鍵字

photodetector ； perovskite ； localized surface plasmon ； quantum dot ； nano-material ； heterojunction

參考文獻

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