High-spin molecules of phosphorus and nitrogen-centered radicals

+131hlm.;24c

Triplet-state di(cation radicals) of 1,3-phenylene-bis(methylene phosphorane)

EPR spectroscopy is used to characterize a novel triplet ground state diradical obtained from oxidation of 1,3-phenylene-bis{[(4-t-butylphenyl)methylene]triphenyl phosphorane}.</p

Double and triple junction polymer solar cells processed from solution

Multiple junction solar cells incorporating polymer:fullerene bulk heterojunctions as active layers and soln. processed electron and hole transport layers are presented. The recombination layer, deposited between the active layers, is fabricated by spin coating ZnO nanoparticles from acetone, followed by spin coating neutral pH poly(3,4-ethylenedioxythiophene) from water and short UV illumination of the completed device. The key advantage of this procedure is that each step does not affect the integrity of previously deposited layers. The open-circuit voltage (Voc) for double and triple junction solar cells is close to the sum of the Voc's of individual cells. [on SciFinder (R)

Efficient inverted tandem polymer solar cells with a solution-processed recombination layer

Solution-processed tandem polymer solar cells with an inverted polarity configuration provide a power conversion efficiency of 5.8%. The tandem cells use an almost loss-free recombination layer and two photoactive layers, with wide and small bandgaps, to increase the power conversion efficiency beyond that of the corresponding single-layer cells