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Kinetic Barrier Against Standing Up of Pentacene Molecules Upon a Pentacene Monolayer (Phys. Status Solidi RRL 8/2018)
Author(s) -
Zhang Lei,
Huo Shuchun,
Fu Xing,
Hohage Michael,
Sun Lidong
Publication year - 2018
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201870325
Subject(s) - pentacene , monolayer , annealing (glass) , molecule , substrate (aquarium) , chemistry , materials science , chemical physics , analytical chemistry (journal) , nanotechnology , thin film transistor , layer (electronics) , organic chemistry , oceanography , geology , composite material
Lei Zhang et al. (article no. 1800230 ) report on the growth of pentacene thin films on the Cu(110)‐(2×1)O surface as a function of substrate temperature. In particular, reflectance difference spectroscopy (RDS) has been applied in‐situ to monitor the orientation of the pentacene molecules during the growth and subsequent annealing. Deposition at a substrate temperature of 230 K results in a lying‐down orientation for all pentacene molecules. Subsequent annealing to a temperature of 350 K induces reorientation for molecules above the first monolayer into a standing‐up configuration. By a quantitative analysis on the corresponding evolution of the RD signals, the kinetic barrier of the reorientation of a pentacene molecule from lying‐down to standing‐up has been determined to be 970 ± 150 meV with an associated attempt frequency in the order of 10 14 Hz. The system studied is rather general for organic thin film growth involving an intermediately weak molecule–surface interaction and the energy barrier determined here should thus be representative.