Electro-active nanofibers of a tetrathiafulvalene derivative with amide hydrogen bonds as a dopant-free hole transport material for perovskite solar cells
Electro-active nanofibers of a tetrathiafulvalene derivative with amide hydrogen bonds as a dopant-free hole transport material for perovskite solar cells
复制标题
DOI：
10.1016/j.solener.2019.10.078
复制
发表时间：
2019-12-01
期刊：
影响因子：
6.7
通讯作者：
Islam, Ashraful
中科院分区：
文献类型：
--
作者：
Kaneko, Ryuji;Chowdhury, Towhid H.;Islam, Ashraful
一种含有两个用于分子间氢键的酰胺单元的四硫富瓦烯衍生物（双酰胺 - TTF）被发现可形成超分子组装体，其中分子间的TTF核相互堆叠。基于双酰胺 - TTF的薄膜电导率为1.28×10⁻⁵ S cm⁻¹，大于掺杂有叔丁基吡啶和双（三氟甲烷）磺酰亚胺锂盐的螺 - OMeTAD（8.37×10⁻⁶ S cm⁻¹）。双酰胺 - TTF被用作钙钛矿太阳能电池（PSCs）的空穴传输材料（HTM）。双酰胺 - TTF薄膜的最高占据分子轨道（HOMO）能级比螺 - OMeTAD更深，从而使PSCs的开路电压提高。使用无掺杂剂的基于双酰胺 - TTF的空穴传输材料制备的PSCs实现了14.5%的功率转换效率，短路电流密度（J₍ₛₑ₎）为19.8 mA cm⁻²，开路电压（Vₒₛ）为1.11 V，填充因子（FF）为66%，这与使用掺杂剂的螺 - OMeTAD所获得的结果（15.5%）相当。
A tetrathiafulvalene derivative containing two amide units for intermolecular hydrogen bonds (Bis-amide-TTF) was found to form supramolecular assemblies, in which intermolecular TTF cores were stacked with each other. The electrical conductivity of Bis-amide-TTF-based film was 1.28 x 10(-5) S cm(-1), which was greater than that of spiro-OMeTAD doped with t-butylpyridine and bis(trifluoromethane)sulfonimide lithium salt (8.37 x 10(-6) S cm(-1)). Bis-amide-TTF was applied as a hole transport material (HTM) for perovskite solar cells (PSCs). The Bis-amide-TTF film has a deeper HOMO level than that of spiro-OMeTAD, leading to an increased open-circuit voltage of the PSCs. The power conversion efficiency of 14.5% with a short-circuit current density (J(sc)) of 19.8 mA cm(-2), an open-circuit voltage (V-OC) of 1.11 V, and a fill factor (FF) of 66% was achieved for PSCs fabricated with the dopant-free Bis-amide-TTF-based HTM, which was comparable to that obtained with spiro-OMeTAD with the dopants (15.5%).