Growth of Large-Size Organic Molecular Crystals for Optoelectronic Applications
Organic molecular crystals,bounded together by non-covalent interactions,are three-dimensional long-range ordering and thermodynamic stable,and have low defect density and show rich prospects for applications in organic field effect transistors(OFETs),X-ray imaging,nonlinear optics,optical waveguides,flexible wearable devices,and lasers.However,previous research is mainly based on organic bulk crystals or small-size crystals,and there is less research on large-size organic molecular crystals while practical application scenarios often require large-size organic molecular crystals,such as transistor arrays and circuits requiring inch-level crystal films,X-ray imaging and nonlinear optical frequency conversion require centimeter-level crystals.However,it is difficult to obtain high-quality large-size organic molecular crystals,and there is no summary and review on the growth and optoelectronic properties of large-size organic molecular crystals at home and abroad.In this review,we first introduce the growth mechanism and growth method of molecular crystals,followed by the materials for growing large-size organic molecular crystals.Then we summarize the applications of large-size organic molecular crystals in optoelectronic aspects,such as long-persistent luminescence,nonlinear optics,X-ray imaging,fast neutron detection,field-effect transistors,and photodetectors.Finally,the challenges in this field are discussed and an outlook on future development is provided.