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X-RAY RUNS: Apply for Beamtime

2017  Nov 1 - Dec 21

2018  Feb 7 - Apr 3
2018  Proposal/BTR deadline: 12/1/17

2018  Apr 11 - Jun 4
2018  Proposal/BTR deadline: 2/1/18

Growth of Organic Semiconductors from a Supersonic Molecular Beam Source
Presented by:  Tushar Desai, Engstrom Group, Cornell

Organic semiconductors, such as pentacene thin films, have attracted much attention owing to their interesting electronic properties, which make them good candidates for use in organic thin film transistors. In recent years, we have developed the technique of supersonic molecular beams as a means to deposit thin films of pentacene and other small molecules with greater control and versatility than traditional vacuum sublimation processes. In supersonic beams, molecules possess kinetic energy in the range of 1 to 10 eV, making it possible to improve the growth behavior of organic crystals. We have investigated the dynamics of growth of pentacene thin film in a broad parameter space by coupling supersonic molecular beam deposition with in situ real-time X-ray scattering measurements at G3. This exploratory research has led to the discovery of a novel growth behavior, which is believed to stem from the formation of molecular clusters in the supersonic beam. This talk will present an overview of our research efforts at G-line.