Laboratoire de Photoniques et Interfaces, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, Station 6, 1015 Lausanne, Switzerland.
J Am Chem Soc. 2011 Nov 16;133(45):18042-5. doi: 10.1021/ja207367t. Epub 2011 Oct 25.
Chemical doping is an important strategy to alter the charge-transport properties of both molecular and polymeric organic semiconductors that find widespread application in organic electronic devices. We report on the use of a new class of Co(III) complexes as p-type dopants for triarylamine-based hole conductors such as spiro-MeOTAD and their application in solid-state dye-sensitized solar cells (ssDSCs). We show that the proposed compounds fulfill the requirements for this application and that the discussed strategy is promising for tuning the conductivity of spiro-MeOTAD in ssDSCs, without having to rely on the commonly employed photo-doping. By using a recently developed high molar extinction coefficient organic D-π-A sensitizer and p-doped spiro-MeOTAD as hole conductor, we achieved a record power conversion efficiency of 7.2%, measured under standard solar conditions (AM1.5G, 100 mW cm(-2)). We expect these promising new dopants to find widespread applications in organic electronics in general and photovoltaics in particular.
化学掺杂是改变分子和聚合物有机半导体电荷输运性质的重要策略，这些半导体在有机电子器件中得到了广泛的应用。我们报告了一类新型的 Co(III) 配合物作为基于三芳胺的空穴导体（如 spiro-MeOTAD）的 p 型掺杂剂的应用，以及它们在固态染料敏化太阳能电池（ssDSCs）中的应用。我们表明，所提出的化合物满足了这一应用的要求，并且所讨论的策略在不依赖常用的光掺杂的情况下，有望调节 spiro-MeOTAD 在 ssDSCs 中的电导率。通过使用最近开发的具有高摩尔消光系数的有机 D-π-A 敏化剂和 p 掺杂的 spiro-MeOTAD 作为空穴导体，我们在标准太阳能条件（AM1.5G，100 mW cm(-2))下实现了 7.2%的创纪录功率转换效率。我们预计这些有前途的新型掺杂剂将在有机电子学和特别是光伏领域得到广泛应用。
