Tountas, MarinosTopal, YaseminVerykios, ApostolosSoultati, AnastasiaKaltzoglou, AndreasPapadopoulos, Theodoros A.Auras, FlorianSeintis, KostasFakis, MihalisPalilis, Leonidas C.Tsikritzis, DimitrisKennou, StellaFakharuddin, AzharSchmidt-Mende, LukasGardelis, SpyrosKus, MahmutFalaras, PolycarposDavazoglou, DimitrisArgitis, PanagiotisVasilopoulou, Maria2018-03-162018-03-162017-12-21Tountas, M., et al. (2017). A Silanol-Functionalized Polyoxometalate with Excellent Electron Transfer Mediating Behavior to ZnO and TiO 2 Cathode Interlayers for Highly Efficient and Extremely Stable Polymer Solar Cells. Journal of Materials Chemistry C, 6, 1459-1469. http://doi.org/10.1039/C7TC04960A2050-752610.1039/C7TC04960Ahttp://hdl.handle.net/10034/620964Combining high efficiency and long lifetime under ambient conditions still poses a major challenge towards commercialization of polymer solar cells. Here we report a facile strategy that can simultaneously enhance the efficiency and temporal stability of inverted photovoltaic architectures. Inclusion of a silanol-functionalized organic–inorganic hybrid polyoxometalate derived from a PW9O34 lacunary phosphotungstate anion, namely (nBu4N)3[PW9O34(tBuSiOH)3], significantly increases the effectiveness of the electron collecting interface, which consists of a metal oxide such as titanium dioxide or zinc oxide, and leads to a high efficiency of 6.51% for single-junction structures based on poly(3-hexylthiophene):indene-C60 bisadduct (P3HT:IC60BA) blends. The above favourable outcome stems from a large decrease in the work function, an effective surface passivation and a decrease in the surface energy of metal oxides which synergistically result in the outstanding electron transfer mediating capability of the functionalized polyoxometalate. In addition, the insertion of a silanol-functionalized polyoxometalate layer significantly enhances the ambient stability of unencapsulated devices which retain nearly 90% of their original efficiencies (T90) after 1000 hours.enhttp://creativecommons.org/licenses/by-nc-nd/4.0/Polymer solar cellsArticleJournal of Materials Chemistry C