Solution-Printed Organic Semiconductor Blends Exhibiting Transport Properties on Par with Single Crystals

Solution-printed organic semiconductors have emerged in recent years as promising contenders for roll-to-roll manufacturing of electronic and optoelectronic circuits. The stringent performance requirements for organic thin-film transistors (OTFTs) in terms of carrier mobility, switching speed, turn-on voltage and uniformity over large areas require performance currently achieved by organic single-crystal devices, but these suffer from scale-up challenges. Here we present a new method based on blade coating of a blend of conjugated small molecules and amorphous insulating polymers to produce OTFTs with consistently excellent performance characteristics (carrier mobility as high as 6.7 cm2V−1s−1, low threshold voltages of \u3c1V and low sub threshold swings \u3c0.5Vdec−1). Our findings demonstrate that careful control over phase separation and crystallization can yield solution-printed polycrystalline organic semiconductor films with transport properties and other figures of merit on par with their single-crystal counterparts

Ion bombardment effects in low-pressure plasmas : in situ spectroscopic ellipsometry and Monte-Carlo simulation study

Ion-surface interactions -- Experimental methodology and simulation tools -- Ion-surface interactions on c-si (001) at the radiofrequency -powered electrode in low-pressure plasmas : ex-situ spectroscopic ellipsometry and Monte-Carlo simulation study -- Dynamics of ion bombardment-induced modifications of i(001) at the radiofrequency-biased electrode in low-pressure oxygen plasmas : in situ spectroscopic ellipsometry and Monte-Carlo study -- Interface broadening due to mixing during thin film growth at the radiofrequency-powered electrode in a plasma-enhanced chemical vapor deposition environment -- Interface engineering during plasma-enhanced chemical vapor deposition of porous/dense SiN3 optical multilayers