研究生: |
王執翰 Chih-Han Wang |
---|---|
論文名稱: |
有機小分子太陽能電池:製程基板溫度對元件電性之影響 Effects of molecular packing in CuPc/C60 based photovoltaic device: temperature dependence |
指導教授: |
李志堅
Chih-Chien Lee |
口試委員: |
王錫九
Shea-Jue Wang 范慶麟 Ching-Lin Fan |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電子工程系 Department of Electronic and Computer Engineering |
論文出版年: | 2010 |
畢業學年度: | 98 |
語文別: | 中文 |
論文頁數: | 101 |
中文關鍵詞: | 有機薄膜太陽能電池 、雙層異質接面結構 、基板溫度 |
外文關鍵詞: | CuPc/C60, Bilayer heterojunction, substrate temperature |
相關次數: | 點閱:311 下載:1 |
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本論文以銅酞花青(copper phthalocyanine,CuPc)薄膜作為電子施體(Donor)材料,與富勒烯 (C60) 作為電子受體材料。以高真空蒸鍍系統製作雙層異質接面結構之有機薄膜太陽能電池,探討基板溫度條件對於銅酞花青成膜性質與其元件效率之間的影響。利用X光繞射儀(XRD)及原子力顯微鏡(AFM)觀察分子排列與薄膜表面形貌;並使用光電子光譜儀(AC-2)、紫外/可見光吸收光譜儀(UV/Visible Spectrophotometer)、太陽光模擬系統及空間電荷限制電流(SCLC)進行元件光電性質分析。
實驗結果顯示,隨著基板溫度升高,分子的(結晶面200)結晶性愈好,且薄膜表面形貌粗糙度降低。而分子的最高佔有軌域(Highest occupied molecular orbital,HOMO)也隨著基板溫度的升高而降低。由於銅酞花青薄膜結晶性質改變,其紫外光吸收光譜之特徵吸收峰(波長618 nm)強度隨基板溫度升高而降低,同時觀察到紅位移的現象。載子遷移率則隨溫度上升而有下降的趨勢。從電性量測結果得知,隨著基板溫度上升,效率呈現負向成長,甚至發生不規則的特性曲線。經上述結果推論,銅酞花青薄膜在不同溫度下結晶性的改變,使得主動層與陽極界面能障隨之改變;溫度越高,界面能障越大,進而影響自由載子的傳遞,降低整體元件之光電轉換效率。
In this study, copper (II) phthalocyanine (CuPc) thin films were prepared by vacuum deposition at different substrate temperatures on indium tin oxide (ITO) as the electron donor and fullerene (C60) as the acceptor based bilayer heterojunction organic photovoltaic cells. The purpose of this study was to investigate the effects of molecular packing on performance in organic solar cells. The morphology and structure of the CuPc films was examined by X-ray diffraction (XRD) and atomic force microscopy (AFM) measurement. The optical and electronic properties have been studied by space charge limited current model, photoelectron spectrometer (AC-2) and UV/Visible spectrophotometer.
The results show that various substrate temperatures strongly influences the CuPc film properties and hence the device performance. It has found that (i) improve the molecular ordering and crystallization, (ii) the highest occupy molecular orbital (HOMO) was decreased from 5.18 eV~5.10 eV, (iii) the peak wavelengths in absorption spectrum was shifted from 618 nm to 624 nm and the intensity decreased gradually, (iv) the carrier mobility was decreased and (v) a S-shape kink leading to loss of Voc and Jsc and FF when the substrate temperature increases. In conclusion, we attributed this S-shape kink to the barrier induced the carrier accumulate.
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