Synthesis and Characterization of Small molecular Organic Semiconductors: Applications in Organic Electronics

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/89111

Title:	Synthesis and Characterization of Small molecular Organic Semiconductors: Applications in Organic Electronics
Authors:	亞維明;Arulmozhi, Velusamy
Contributors:	化學學系
Keywords:	有機小分子;有機半導體;有機場效電晶體;染料敏化電池;鈣鈦礦電池;organic small molecules;organic semiconductors;organic field-effect transistors;dye-sensitized solar cells;perovskite solar cells
Date:	2022-07-04
Issue Date:	2022-10-04 10:58:25 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文主要可分為有機薄膜電晶體 (OFET)、染料敏化太陽能電池 (DSSC) 和鈣鈦礦太陽能電池 (PSC) 的材料開發。有機薄膜電晶體 (OFET) 的部分分為 N-type 及 P-type 材料，本研究成功以 TII 為核心，開發出四種不同碳鏈之醌型結構材料，包含 TIIQ-10、TIIQ-b8、TIIQ-b16 和 TIIQ-b17，其中 TIIQ-b16 在 N-type OFET 中表現出高達 2.54 cm2 V -1 s -1 的電子遷移率，電流開關比為 105 ~106，具有單極電子傳輸特性和強環境穩定性。同時成功以 DTTR 為核心，外接不同共軛基團，開發另一系列材料 DFPT-DTTR 及 DFPbT-DTTR，其中 DFPT DTTR 在 P-type OFET 中表現出高達 0.48 cm2 V -1 s -1 的電洞遷移率。鈣鈦礦太陽能電池 (PSC) 的部分，本研究利用 BCDT 作為核心，接上不同苯基烷氧鏈，再分別於末端接上拉電子基團 IN、INCl 與 INBr，共開發出六種材料 INBCDT-8、 INBCDT-b8、INClBCDT-8、INClBCDT-b8、INBrBCDT-8、INBrBCDT-b8，其中以 INBrBCDT-b8 應用於 PSC 中可獲得高達 22.20% 的 PCE 值，FF 值為 79%，JSC 值為 24.44 mA cm-2，VOC 值為 1.15 V ，還可有效地鈍化表面缺陷並增強元件界面處的電荷傳輸能力。同時成功合成出以 maleimide 為核心的材料 MLIBP’-4D，其 PCE 值高達 21.20%。目前已成功合成出應用於 OFET、DSSC 和 PSC 的共軛醌型化合物、有機染敏材料和電洞傳輸材料，這些新材料經由 UV-Vis 及 DPV 測量其光學及電化學性質、DSC 及 TGA 測量其熱穩定性，且利用 X 射線衍射、原子力顯微鏡 (AFM) 和掠入射 X 射線衍射 (GIXRD) 了解分子結構、分子堆疊、薄膜形態、結晶度和元件效能之間的關係，多項材料應用之光電元件正在優化中。;A number of small molecular organic semiconductors have been designed and synthesized for various organic electronics device applications such as organic field-effect transistors (OFETs), dye-sensitized solar cells (DSSCs), and perovskite solar cells (PSCs). The optical, and electrochemical properties of these newly synthesized materials were examined using differential pulse voltammetry (DPV), and UV-Visible absorption spectroscopy. Thermal properties were investigated by differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA). Thin-film microstructure and film morphology were examined by X-ray diffraction, atomic force microscopy (AFM), and grazing incidence X-ray diffraction (GIXRD) to understand the relationship between the molecular structure, film morphology/crystallinity, and device performance. The molecular structures of organic semiconductors and their molecular packing properties were determined by single-crystal X-ray diffraction. In this research, air-processed TIIQ-b16 OFETs exhibit electron mobility up to 2.54 cm2 V −1 s −1 with a current ON/OFF ratio of 105–106 exhibiting unipolar electron transport characteristics and enhanced ambient stability. DFPT-DTTR compound based OFETs exhibit efficient hole transport mobility up to 0.48 cm2 V −1 s −1 . Non-fullerene acceptor (INBrBCDT-b8) was used as an anti-solvent in PSCs yielding an excellent PCE of up to 22.20% with FF of 79%, a JSC of 24.44 mA cm-2 , and a VOC of 1.15 V, also effectively passivate surface defects and enhance charge transport at the device interface. Further, maleimide-based HTM (MLIBP’-4D) with tetra-substituted triphenylamine donors exhibits high performance PCE reaching up to 21.20 % in PSCs. Several conjugated quinoidal compounds, organic dyes, and hole-transporting materials (HTMs) have been synthesized for OFETs, DSSCs, and PSCs, respectively. Presently, device characterization and optimization of these newly developed small molecules are in progress for future publications.
Appears in Collections:	[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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