“…[13] Organic cocrystals were discovered by Wçhler in 1844, [14] but did not begin to attract much attention till 1973 when the cocrystals (charge-transfer complexes) formed from tetrathiafulvalene /7,7,8,8-tetracyanoquinodimethane (TTF-TCNQ) [15] presented high conductivity over aw ide range of temperature,which aroused great research interest in organic optoelectronics. Especially,v ery recently,organic cocrystals,which are regarded as an efficient way to prepare multifunctional and high performance optoelectronic materials,h ave attracted increasing attention owing to their unexpected and versatile chemicophysical properties and charming applications,s uch as high electrical conductivity, [15] photoconductivity, [18] photovoltaics properties, [19] nonlinear optics (NLO), [3,20,21] optical waveguide, [1, 22a] ambipolar charge carrier transportation, [23,24] tunable luminescent features, [3,4,25,26] ferroelectrics, [27,28] stimuli-responsiveness, [10,29] light-driven actuators, [10] liquid crystal materials, [30] and pharmaceutics. insulators, semiconductors,a nd superconductors) and magnetic properties.I n2 004, the first case of ambipolar charge-transport behavior under low temperature based on organic cocrystal bis(ethylenedithiolo)tetrathiafulvalene(BEDT-TTF)-TCNQ was reported, [17] and the door to the charge-carrier-transport area of organic cocrystals was opened.…”