Synthesis and applications of main-chain Ru(<scp>ii</scp>) metallo-polymers containing bis-terpyridyl ligands with various benzodiazole cores for solar cells
作者:Harihara Padhy、Duryodhan Sahu、I-Hung Chiang、Dhananjaya Patra、Dhananjay Kekuda、Chih-Wei Chu、Hong-Cheu Lin
DOI:10.1039/c0jm02532a
日期:——
A series of π-conjugated bis-terpyridyl ligands (M1–M3) bearing various benzodiazole cores and their corresponding main-chain Ru(II) metallo-polymers were designed and synthesized. The formation of metallo-polymers were confirmed by NMR, relative viscosity, and UV-visible titration measurements. The effects of electron donor and acceptor interactions on their thermal, optical, electrochemical, and photovoltaic properties were investigated. Due to the strong intramolecular charge transfer (ICT) interaction and metal to ligand charge transfer (MLCT) in Ru(II)-containing polymers, the absorption spectra covered a broad range of 260–750 nm with the optical band gaps of 1.77–1.63 eV. In addition, due to the broad sensitization areas of the metallo-polymers, their bulk heterojunction (BHJ) solar cell devices containing [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as an electron acceptor exhibited a high short-circuit current (Jsc). An optimum PVC device based on the blended polymer P1 : PCBM = 1 : 1 (w/w) achieved the maximum power conversion efficiency (PCE) value up to 0.45%, with Voc = 0.61 V, Jsc = 2.18 mA cm−2, and FF = 34.1% (under AM 1.5 G 100 mW cm−2), which demonstrated a novel family of conjugated polyelectrolytes with the highest PCE value comparable with BHJ solar cells fabricated from ionic polythiophene and C60.
我们设计并合成了一系列含有各种苯并二唑核心的 π 共轭双叔吡啶配体(M1-M3)及其相应的主链 Ru(II) 金属聚合物。核磁共振、相对粘度和紫外-可见滴定测量证实了金属聚合物的形成。研究了电子供体和受体相互作用对其热学、光学、电化学和光伏特性的影响。由于含 Ru(II)聚合物具有很强的分子内电荷转移(ICT)作用和金属到配体的电荷转移(MLCT)作用,其吸收光谱覆盖了 260-750 nm 的宽范围,光带隙为 1.77-1.63 eV。此外,由于金属聚合物的敏化区域较宽,其含有[6,6]-苯基-C61-丁酸甲酯(PCBM)作为电子受体的体异质结(BHJ)太阳能电池器件显示出较高的短路电流(Jsc)。基于混合聚合物 P1 :PCBM = 1 :1(w/w)的聚氯乙烯器件实现了最高功率转换效率(PCE)值达 0.45%,Voc = 0.61 V,Jsc = 2.18 mA cm-2,FF = 34.1%(在 AM 1.5 G 100 mW cm-2 条件下),这表明一种新型共轭聚电解质系列具有与离子聚噻吩和 C60 制成的 BHJ 太阳能电池相当的最高 PCE 值。