Division of Advanced Materials, Korea Research Institute of Chemical Technology , 141 Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea.
J Am Chem Soc. 2014 Jun 4;136(22):7837-40. doi: 10.1021/ja502824c. Epub 2014 May 23.
Three spiro-OMeTAD derivatives have been synthesized and characterized by (1)H/(13)C NMR spectroscopy and mass spectrometry. The optical and electronic properties of the derivatives were modified by changing the positions of the two methoxy substituents in each of the quadrants, as monitored by UV-vis spectroscopy and cyclic voltammetry measurements. The derivatives were employed as hole-transporting materials (HTMs), and their performances were compared for the fabrication of mesoporous TiO2/CH3NH3PbI3/HTM/Au solar cells. Surprisingly, the cell performance was dependent on the positions of the OMe substituents. The derivative with o-OMe substituents showed highly improved performance by exhibiting a short-circuit current density of 21.2 mA/cm(2), an open-circuit voltage of 1.02 V, and a fill factor of 77.6% under 1 sun illumination (100 mW/cm(2)), which resulted in an overall power conversion efficiency (PCE) of 16.7%, compared to ~15% for conventional p-OMe substituents. The PCE of 16.7% is the highest value reported to date for perovskite-based solar cells with spiro-OMeTAD.
三种螺环-O(Me)TAD 衍生物已经通过 1H/13C NMR 光谱和质谱进行了合成和表征。通过改变每个象限中两个甲氧基取代基的位置，来调节衍生物的光学和电子性质，这通过紫外-可见光谱和循环伏安法测量进行监测。这些衍生物被用作空穴传输材料（HTMs），并比较了它们在制备介孔 TiO2/CH3NH3PbI3/HTM/Au 太阳能电池中的性能。令人惊讶的是，电池性能取决于 OMe 取代基的位置。具有邻位 OMe 取代基的衍生物通过表现出 21.2 mA/cm2 的短路电流密度、1.02 V 的开路电压和 77.6%的填充因子（在 1 个太阳光照（100 mW/cm2）下），显示出了高度改善的性能，导致整体功率转换效率（PCE）达到 16.7%，而传统的对位 OMe 取代基约为 15%。对于基于钙钛矿的太阳能电池，具有 spiro-O(Me)TAD 的 16.7%的 PCE 是迄今为止报道的最高值。
