異靛藍系列高分子作為電子受體材料應用在太陽能電池上已有許多文獻報導，其低能隙及較深的HOMO能階，使其能有較為寬廣的吸收範圍。為了進一步優化異靛藍材料，本論文將異靛藍分子從兩個環內醯胺間的雙鍵拆開，並引入了二氫吡咯並吲哚二酮(Dihydropyrrolo indoledione, DPID)結構作為新的π共軛橋樑來增加共軛長度，並將外側異靛藍分子的苯環改成噻吩，期望能有更小的能隙以及更佳的平面性，以利分子內及分子間的價荷傳輸。 本論文欲研究將電子受體BTPDI單體結構與四個不同的電子供體結構聚合成的高分子特性，分別命名為BTPDI-CN2TVT, BTPDI-CN2bT, BTPDI-bTz以及BTPDI-F2bT，為避免溶解度問題，選擇在BTPDI單體上修飾分岔長碳鏈以及在噻吩異靛藍分子上修飾長碳鏈，透過控制分岔長碳鏈的長度期望能有較好的堆疊性以利提升能量轉換效率。 本論文對合成出之高分子進行一系列的數據量測，包含光學性質、熱性質、電化學性質、堆疊排列探討以及元件效率測試，用以探討高分子材料作為太陽能電池主動層材料對於元件的表現。 ;Isoindigo-based polymers derivatives as n-type materials have been reported by many papers about organic photovoltaics application. Because they have lower band-gap energy and deeper HOMO orbital, they possess broader absorption region. To optimize them, first we dismantle isoindigo molecule through the double bond between two lactams and add Dihydropyrrolo- indoledione (DPID) structure as new conjugate bridge to increase length of conjugation. Second, we modify the benzene of isoindigo molecule to thiophene for much lower band-gap energy and better planarity, which might increase intramolecular as well as intermolecular charge transfer. In this thesis, we want to study the characteristic of polymers about donor material BTPDI monomer polymerize with four acceptors, which named BTPDI-CN2TVT, BTPDI-CN2bT, BTPDI-bTz and BTPDI-F2bT. We add branched alkyl chains on BTPDI monomer and add alkyl chains on thienoisoindigo to avoid poor solubility. By controlling length of branched alkyl chains, we hope it could get better stacking and improve the power conversion efficiency. We do some measurements of these four polymers such as spectroscopic, thermochemical, electrochemical, stacking and orientation and device performance to discuss the behavior when they are used by material of organic photovoltaics active layer
