Nanostructured TiO2/CH3NH3PbI3 heterojunction solar cells employing spiro-OMeTAD/Co-complex as hole-transporting material
作者:Jun Hong Noh、Nam Joong Jeon、Yong Chan Choi、Md. K. Nazeeruddin、Michael Grätzel、Sang Il Seok
DOI:10.1039/c3ta12681a
日期:——
For using 2,2′,7,7′-tetrakis(N,N′-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) as a hole conductor in solar cells, it is necessary to improve its charge-transport properties through electrochemical doping. With the aim of fabricating efficient mesoscopic TiO2/CH3NH3PbI3 heterojunction solar cells, we used tris[2-(1H-pyrazol-1-yl)-4-tert-butylpyridine)cobalt(III) tris(bis(trifluoromethylsulfonyl) imide)] (FK209) as a p-dopant for spiro-OMeTAD. The mixture of spiro-OMeTAD, FK209, lithium bis(trifluoromethylsulfonyl)imide (Li-TFSI), and 4-tert-butylpyridine (TBP) exhibited significantly higher performance than mixtures of pristine spiro-OMeTAD, spiro-OMeTAD, and FK209, and spiro-OMeTAD, Li-TFSI, and TBP. Such a synergistic effect between the Co-complex and Li-TFSI in conjunction with spiro-OMeTAD effectively improved the power conversion efficiency (PCE) of the fabricated solar cells. As a result, we achieved PCE of 10.4%, measured under standard solar conditions (AM 1.5G, 100 mW cm−2).
要在太阳能电池中使用 2,2′,7,7′-四(N,N′-二对甲氧基苯胺)-9,9′-螺二芴(spiro-OMeTAD)作为空穴导体,就必须通过电化学掺杂来改善其电荷传输特性。为了制造高效的介观 TiO2/CH3NH3PbI3 异质结太阳能电池,我们使用了三[2-(1H-吡唑-1-基)-4-叔丁基吡啶)钴(III)三(双(三氟甲基磺酰基)亚胺)](FK209)作为螺-OMeTAD 的对掺杂剂。螺-OMeTAD、FK209、双(三氟甲基磺酰基)亚胺锂(Li-TFSI)和 4-叔丁基吡啶(TBP)的混合物的性能明显高于原始螺-OMeTAD、螺-OMeTAD 和 FK209 以及螺-OMeTAD、Li-TFSI 和 TBP 的混合物。Co-complex 和 Li-TFSI 与螺-OMeTAD 之间的协同效应有效提高了所制造太阳能电池的功率转换效率(PCE)。因此,我们在标准太阳能条件(AM 1.5G,100 mW cm-2)下测量的 PCE 达到了 10.4%。