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Vertical Charge Transport via Small Polaron Hopping within TIPS‐Pentacene Lamellar Single Crystal
Author(s) -
Wang Jiawei,
Liu Tianjun,
Dong Ji,
Li Molin,
He Jun,
Jiang Chao
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201700456
Subject(s) - pentacene , polaron , trapping , materials science , charge (physics) , chemical physics , lamellar structure , condensed matter physics , crystal (programming language) , variable range hopping , molecule , molecular physics , fabrication , optoelectronics , nanotechnology , physics , thermal conduction , thin film transistor , computer science , ecology , layer (electronics) , quantum mechanics , composite material , biology , programming language , electron , medicine , alternative medicine , pathology
A modified liquid method is employed to grow an ultralarge 6,13‐bis(triisopropylsilylethynyl)pentacene crystal, ensuring fabrication and measurements of the two terminal devices. The hole transport mechanism is studied by analyzing the space charge limited currents (SCLCs) at various temperatures. Modified SCLC theory with a small polaron hopping model is developed and employed to successfully simulate the I – V curves. Values of effective hopping distance, transfer integral, and reorganization energy are extracted and reasonably discussed. A scenario is suggested that hopping transport takes place from one molecule to its nearest neighbor along the c‐ axis, with every molecule acting as a trapping center.