Syntheses of D-A-A Type Small Molecular Donor Materials Having Various Electron Accepting Moiety for Organic Photovoltaic Application
作者:Nahyeon Kim、Sangman Park、Myong-Hoon Lee、Jaemin Lee、Changjin Lee、Sung Cheol Yoon
DOI:10.1166/jnn.2016.11093
日期:2016.3.1
Small molecular donor, DTDCTB achieved a high power conversion efficiency (PCE) value of 6.6±0.2% in vacuum-deposited planar mixed heterojunction (PMHJ) structure.1 However, the same material just recorded PCE of 0.34% in solution processed small molecule based bulk heterjunction (BHJ) organic photovoltaic cells. For the improvement of organic photovoltaic cells (OPVs), In this study, we designed and synthesized several D-A-A (donor-acceptor-acceptor) type molecular electron donating materials. Ditolylaminothienyl moiety as an electron donating group connected to 1,2,5-benzothiadiazole as a conjugated electron accepting unit, simultaneously with an electron accepting terminal group such as cyano alkyl acetate and N-alkyl rhodanine. The thermal, photophysical, and electrochemical properties of prepared small molecules were investigated by DSC, UV/Vis spectroscopy and Cyclic Voltametry, respectively. As a result, 0.89% of PCE can be obtained from OPV using a mixture of DTATBTER and PCBM as an active layer with a Voc of 0.87 V, a Jsc of 3.20 mA/cm2, and a fill factor of 31.9%.
在真空沉积平面混合异质结(PMHJ)结构中,小分子供体 DTDCTB 实现了 6.6±0.2% 的高功率转换效率(PCE)值。为了改进有机光伏电池(OPV),本研究设计并合成了几种 D-A-A(供体-受体-受体)型分子电子供体材料。作为电子供体的二羟基氨基噻吩基团与作为共轭电子受体单元的 1,2,5-苯并噻二唑相连,同时与氰基烷基乙酸酯和 N-烷基罗丹宁等电子受体末端基团相连。通过 DSC、紫外/可见光谱和循环伏安法分别研究了制备的小分子的热学、光物理和电化学特性。结果表明,使用 DTATBTER 和 PCBM 的混合物作为活性层,可以从 OPV 中获得 0.89% 的 PCE,Voc 为 0.87 V,Jsc 为 3.20 mA/cm2,填充因子为 31.9%。