Air sensitivity and encapsulation

As discussed in Section 3.2.1, many organic semiconductors are not stable against exposure to oxygen and water. Several strategies have been developed to remove these elements from organic semiconductor layers and seal against their penetration. 

Perhaps the simplest strategy is to laminate a plastic sheet on top of the transistors with a suitable adhesive [99]. It is also possible to coat OFETs with a layer of parylene, teflon, or other compatible polymer and optionally seal the devices using a metal vapor barrier layer (e.g. [100]). Heating many OFET materials for dehydration in an inert ambient is also possible, and may be important depending on the material s reactivity with water [101]. 

---