Pentacene has attracted much attention as an organic electric material, but it often suffers from its very low solubility. We now report self‐assembled rectangular host 18+ that has two pairs of terpyridine–PtII moieties aligned parallel to each other and connected by diyne linkers. The host encapsulated unsubstituted pentacene (2) with a remarkably strong binding constant of Ka ≈ 107 M–1 and solubilized it in acetonitrile up to the millimolar level. For smaller acenes (i.e., naphthalene to tetracene), a planar arrangement of two molecules inside the cavity was achieved. These results made it possible to analyze the acenes in the solution phase and provided a way to align the guests by a solution‐processing method as a possible application, and thus, they contribute to fundamental physical organic chemistry as well as organic electronics.

We have investigated the dependence of device characteristics of bulk-heterojunction organic thin-film solar cells on the concentration of glycerol and sorbitol addition in poly(3,4-ethylenedioxy thiophene):poly(4-styrene sulfonate) (PEDOT:PSS) solutions for fabricating buffer layers. The device structure is ITO/buffer/regioregular poly(3-hexylthiophene) (P3HT):[6,6]-phenyl C 61-butyric acid methylester (PCBM)/ Al . Glycerol addition is effective for increasing power conversion efficiency (PCE) from 1.25 to 1.41% because of the increase in short-circuit current density (J sc ) without decreasing open-circuit voltage (V oc ). On the other hand, sorbitol addition decreases PCE from 1.25 to 1.04%, owing to the decrease in V oc . This difference in V oc behavior is ascribed to different work function of PEDOT:PSS with glycerol and sorbitol treatment.

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We report the first observation of multiple-gap states in a tin film under high tunnel injection.The experiments are performed for both lowand high-voltage injection regimes. We observe the two-gap state for injection at the gap edge and the three-gap state for injection above the gap edge. The multiple-gap structure clearly appears for temperatures below T", whereas it is considerably smeared or has disappeared above Tz, indicating a significant dependence on phonon trapping. The observed phenomena are qualitatively similar to those for dirty aluminum films; they are interpreted by the model of diffusive instability accompanying abnormal quasiparticle flow from regions of low concentration to high concentration.

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