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標題: | 高分子離子液體及低溫氧氣電漿製程用於平面鈣鈦礦太陽能電池 Employing Polymer Ionic Liquid and Low Temperature Oxygen Plasma Process for Planar Perovskite Solar Cells |
作者: | Yu-Tong Wang 王語彤 |
指導教授: | 何國川(Kuo-Chuan Ho) |
關鍵字: | 低溫,氧氣電漿,鈍化,鈣鈦礦太陽能電池,高分子離子液體,二氧化錫, Low temperature,Oxygen plasma,Passivation,Perovskite solar cell,Polymer ionic liquid,Tin oxide, |
出版年 : | 2019 |
學位: | 碩士 |
摘要: | 本文旨在研究高分子離子液體及低溫氧氣電漿製成應用於平面鈣鈦礦太陽能電池。本論文主要分為兩大部分:使用高分子離子液體控制甲基氨基碘化鉛晶體成長應用於平面鈣鈦礦太陽能電池(第三章),和使用低溫氧氣電漿製備平面鈣鈦礦太陽能電池之二氧化錫電子傳輸層(第四章)。
在第三章中,我們成功藉由聚偏二氟乙烯和1-丁基-3-甲基咪唑氯合成一種新的高分子離子液體並使用其控制鈣鈦礦晶體之成長,所合成之高分子離子液體中的帶孤對電子之氧原子可以和甲胺碘中的氮原子形成氫鍵,從而減緩甲基氨基碘化鉛晶體成長速度,延長晶體成長時間,得到晶粒更大之晶體。此現象可通過對鈣鈦礦薄膜進行X光散射測量和表面掃描顯微鏡圖譜的結果來證實,同時,我們可以透過螢光光譜訊號的強度變化得知高分子離子液體有效鈍化了鈣鈦礦薄膜的表面,提升電荷轉移效率與元件表現。元件效率從14.5 提升至17.0%。 在第四章中,成功利用70 °C低溫氧氣電漿製程,以旋轉塗布法完成緻密二氧化錫電子傳輸層的製備。由XPS資料分析與電性量測,證實所製備之薄膜成分為二氧化錫,所製備之電子傳輸層之導電度提升,氧空缺的密度下降。且製備之二氧化錫薄膜表面更平整,有助於更高結晶性鈣鈦礦層的沉積。由於鈣鈦礦太陽能电池內電阻降低,短路電流提升。使用所開發之低溫氧氣電漿製成之元件光電轉換效率達到16.7%,平均效率高於使用傳統高溫燒結製成二氧化錫電子傳輸層之元件(14.6%),顯示此低溫氧氣電漿製程具有作為開發低成本,大面積柔性光電元件的潛力。 This thesis mainly focuses on two different but related parts, namely defect passivation of crystal-controlled MAPbI3 with polymer ionic liquid for efficient perovskite solar cells (Chapter 3) and low temperature oxygen plasma sintered SnO2 as electron transport layer for planar perovskite solar cells (Chapter 4). The overview of these two applications will be displayed in introduction (Chapter 1). Moreover, the experimental procedures (Chapter 2) includes the chemical reagent, material characterization and the principle of device analysis. In Chapter 3, we successfully synthesized a new polymer ionic liquid (PIL), poly[vinylidene fluoride-co-hexafluoro propyleneco-vinylideneaminooxomethyl-1-butylimidazolium choloride] denoted as PFICl. Which was grafted of 1-butylimidazolium chloride onto poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), The PFICl was incorporated into the CH3NH3PbI3 precursor to control the perovskite crystal growth in a one-step spin coating process. The long chain polymer act as the scaffold which assist perovskite crystal growth. Meanwhile the polymer ionic liquid formed hydrogen bond with the nitrogen atoms in methylammonium iodide (MAI), as witnessed by the slow down process of crystallization and NMR peak shift. The result shows that a more compact perovskite film with larger grain size has been prepared. Meanwhile, we found the PFICl passivated the perovskite layer surface, thereby making the charge transfer process more effective. With this method, the solar cell efficiency is enhanced from 14.5 to 17.0%. In Chapter 4, a low temperature (about 70 °C) oxygen plasma treatment was applied to in fabrication of SnO2 films. This method is a simple photochemical treatment which is simple to operate and can be easily applied to the organic components. In addition, PSCs with oxygen plasma-sintered SnO2 films as ETL were successfully fabricated. The device exhibited excellent photovoltaic performance as high as 16.7%, which is even higher than the value (14.6%) reported for a counterpart device with solution-processed and high temperature annealed SnO2 films as ETL. This ltemperature solution-processed and oxygen plasma-sintered SnO2 films are suitable for the low-cost, large yield solution process on a flexible substrate for optoelectronic devices. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/72730 |
DOI: | 10.6342/NTU201902102 |
全文授權: | 有償授權 |
顯示於系所單位: | 化學工程學系 |
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