Organic single crystals: An essential step to new physics and higher performances of optoelectronic devices

Organic Electronics is one of the most active areas of interdisciplinary research, targeting implementation of organic semiconductors in electronic applications ranging from low-cost, light-weight, fl exible and wearable electronics, to light-emitting diodes, sensors, and solar cells. [ 1 ] In order to provide a stronger fundamental support to this thriving applications-driven fi eld, a deeper understanding of the basic principles governing the operation of organic materials and devices is necessary. Such understanding would help to design better semiconductors, improve device performance, and invent novel device concepts and prototypes. However, this task is very challenging because of the complexity and enormous variety of organic-molecule semiconductors, as well as the multitude of factors and microscopic phenomena that defi ne their electronic properties.