利用鈀催化之碳氫鍵活化/芳香環化反應快速合成以苯并三噻吩為核心結構的電洞傳輸材料並應用於鈣鈦礦太陽能電池;Facile Synthesis of Benzotrithiophene-Centered HTMs for Perovskite Solar Cells by Pd-Catalyzed C-H Activation/Arylation Reactions

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Title:	利用鈀催化之碳氫鍵活化/芳香環化反應快速合成以苯并三噻吩為核心結構的電洞傳輸材料並應用於鈣鈦礦太陽能電池;Facile Synthesis of Benzotrithiophene-Centered HTMs for Perovskite Solar Cells by Pd-Catalyzed C-H Activation/Arylation Reactions
Authors:	彭奕愷;Peng, Yi-Kai
Contributors:	化學工程與材料工程學系
Keywords:	電洞傳輸材料;鈣鈦礦太陽能電池;碳氫鍵芳香環化反應;苯并三噻吩;Hole-transporting materials;Perovskite solar cells;C-H arylation;Benzotrithiophene
Date:	2018-07-31
Issue Date:	2018-08-31 11:32:58 (UTC+8)
Publisher:	國立中央大學
Abstract:	現今最廣泛使用的小分子有機電洞傳輸材料Spiro-OMeTAD雖擁有相當良好的電洞遷移率並帶來優良的光電轉換效率，但其複雜繁瑣的合成步驟使得製備成本相當高昂，因此學者們漸漸開發出其他成本相對較低的有機小分子材料以取代Spiro-OMeTAD。本文利用鈀催化直接碳氫鍵芳香環化反應，以苯并三噻吩 (benzotrithiophene, BTT) 作為核心結構，三苯胺衍生物 (triphenylamine, TPA) 作為末端基，並在中間置入3,4-乙烯二氧噻吩 (3,4-ethylenedioxythiophene, EDOT) 作為π架橋合成兩系列的星狀電洞傳輸材料，並測量其電化學性質、熱性質、電洞遷移率與光學性質。直接碳氫鍵芳香環化反應成功將傳統人名反應所需的四個步驟縮減為一步驟合成，使製備成本大幅降低。本研究中的電洞傳輸材料應用於鈣鈦礦太陽能電池的表現如下： (1) 電洞傳輸材料YKP03在一般條件下能達到14.6%的光電轉換效率，更能在不添加任何吸濕性摻雜劑的情況下達到13.8%的光電轉換效率，這項優點除了能有效降低元件製程成本，更是大幅提升了電池的穩定性。 (2) 另一個表現優異的為具有叔丁基末端取代基的電洞傳輸材料YKP05，擁有高度的熱穩定性以外，也能達到15%的光電轉換效率。本文提供研究者們一個新的方向，利用具有步驟經濟與綠色化學的合成法製備電洞傳輸材料，並在分子設計上提出新的想法讓材料不需搭配摻雜劑也能於鈣鈦礦太陽能電池中完整發揮傳導電洞的功能。 ;We develop new benzotrithiophene (BTT)-base hole-transporting materials, synthesized by 3-fold C-H/C-Br cross-couplings. We use benzotrithiophene as middle core and 3,4-ethylenedioxythiophene (EDOT) as π-linker. In the end group, we use triphenylamines as donors. The reaction conditions have been optimized by several entries and all HTMs have good yields. Perovskite solar cells based on the new HTM YKP03, which has EDOT as π-linker, achieve 14 % of power conversion efficiency with dopants and get over 13 % of PCE under dopant-free condition. Another HTM YPK05, which has t-butyl groups as function groups, shows great thermal stability and gets over 15 % of PCE in perovskite solar cells. These results indicate that the new HTMs have potential to be used in perovskite solar cells due to the less synthetic steps and avoiding to use hygroscopic dopants, making the elements become more economical and more stable comparing with the normally used HTM Spiro-OMeTAD.
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] Electronic Thesis & Dissertation

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