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研究生： 林亭佑
Lin, Ting-You
論文名稱： STM與STS研究Ag(111)表面上的Extended Phenacene
Extended Phenacenes on Ag(111) in STM and STS
指導教授： 霍夫曼
Hoffmann, Germar
口試委員: 唐述中
Tang, Shu-Jung
蘇維彬
SU, Wei-Bin
學位類別： 碩士
Master
系所名稱： 理學院 - 物理學系
Department of Physics
論文出版年： 2025
畢業學年度： 113
語文別： 英文
論文頁數： 73
中文關鍵詞： 量子穿隧顯微鏡 、有機半導體材料 、有機分子
外文關鍵詞： STM, Phenacene, OFET
相關次數： 點閱：3  下載：0 
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    • 在本篇論文中，我提出了對在 Ag(111) 上製備的Dibenzo[7]Phenacene (以下簡稱為 DB7P) 的研究。 我們使用溫度 77 K 並於超高真空環境中操作的掃描穿隧顯微鏡 (STM) 和掃描穿隧能譜 (STS) 實驗。我將討論 DB7P 在 Ag(111) 上的第一層和第二層的吸附幾何形狀以及自組裝結構的形成。以及透過 STS 測量來探討電子特性，例如能帶結構和態密度。為了優化日常實驗流程，我們使用 Arduino 以控制系統並實現自動化與遠端控制。透過 Arduino，我們可以藉由電腦遠端控制電子設備，以記錄所需的資訊並更精確地進行實驗。在此篇論文中，Arduino 控制主要探討於熱電偶讀數和電源供應的讀取。

    In this thesis, I present my study on DiBenzo[7]Phenacene, in the following denoted as DB7P, prepared on Ag(111). We use an STM operated at 77 K and under ultra-high vacuum for STM (Scanning Tunneling Microscopy) and STS (Scanning Tunneling Spectroscopy) experiments. I will discuss the adsorption geometry and the formation of self-assembled structures of DB7P on Ag(111) for both the first and second layers. Electronic properties, such as the band structure and density of states, are addressed with STS measurements. The results are compared with those obtained on DB6P, which was studied in the same system, with Yu-Feng Yeh.
    To optimize routine experimental processes, we developed Arduino software for automation and remote control. Using an Arduino, we can remotely control electronic devices via a computer to record all information we need and get more accurate access to the experiment. Here, the Arduino control mainly focuses on the readout of thermocouples and a power supply.

    1 Introduction 5 2 Background 6 2.1 Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1.1 Quantum Tunneling . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Instrumentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2.1 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2.2 Thermocouple . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.2.3 Molecules on Surfaces . . . . . . . . . . . . . . . . . . . . . 11 2.2.4 Preparation of Ag(111) and deposition of DB6P / DB7P . . 13 2.2.5 Preparation of Ag(111) . . . . . . . . . . . . . . . . . . . . . 14 2.2.6 Preparation of DB7P on Ag(111) . . . . . . . . . . . . . . . 16 3 Hardware / Software Project 19 3.1 Arduino Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.1.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.1.2 Arduino . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.1.3 Electronic Setup . . . . . . . . . . . . . . . . . . . . . . . . 20 3.1.4 Flow Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.1.5 Communication Protocol . . . . . . . . . . . . . . . . . . . . 22 3.1.6 Python . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.1.7 Arduino Setup . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.1.8 Demonstration . . . . . . . . . . . . . . . . . . . . . . . . . 26 4 MSc Research 27 4.1 Experiments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.1.1 Summarize of DB6P on Ag(111) . . . . . . . . . . . . . . . . 28 4.1.2 DB7P on Au(111) . . . . . . . . . . . . . . . . . . . . . . . . 34 4.1.3 1st ML DB7P on Ag(111) . . . . . . . . . . . . . . . . . . . 37 4.1.4 1st ML DB7P on Ag(111) Overview . . . . . . . . . . . . . . 37 4.1.5 Determination of Crystallographic Directions . . . . . . . . . 38 4.1.6 Domain A . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 4.1.7 Domain B . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4.1.8 Electronics Structure - Bias Dependence . . . . . . . . . . . 42 4.1.9 Electronics Structure - STS . . . . . . . . . . . . . . . . . . 43 4.1.10 2nd ML DB7P on Ag(111) . . . . . . . . . . . . . . . . . . . 47 4.1.11 Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 4.1.12 Crystallographic direction . . . . . . . . . . . . . . . . . . . 48 4.1.13 Electronics Structure - Bias Dependence . . . . . . . . . . . 49 4.1.14 Electronics Structure - STS . . . . . . . . . . . . . . . . . . 52 4.1.15 Comparison of DB6P and DB7P on Ag(111) . . . . . . . . . 55 5 Summary 59

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