Two-dimensional Organic Crystalline Semiconductor Arrays And Their Application In High-performance Devices

Organic semiconductors have great potential for various functional optoelectronic applications.In terms of information technology,large-area and high-precision field-effect transistors,which are based on organic materials with flexible and solution processability,are key candidates for realizing logic operations and information processing.In terms of biomedicine,organic materials with bio-compatibility have a great potential for high-sensitive wearable sensors,which can be used to detect human health in real time.In terms of new energy,organic materials,which have the merits of easy process fabrication and large-area production,can be applied to low-consumption and low-cost display devices.However,the processing of high-integration and high-performance organic optoelectronic devices requires controllable patterning technology.The development of patterning technique allows organic semiconductors to be deposited with desired geometric domains,giving rise to the reduction of leakage current,the elimination of cross-talk effect,and the decrease of energy consumption.Therefore,it is urgent to realize the solution-based patterned growth of high-quality organic semiconductors.Here,we focus on the solution-processed organic crystalline semiconductor arrays and their applications in high-performance devices.The innovations in our work mainly contain the following aspects:1.We fabricated multilayer semiconductor arrays by the substrate-patterning method,and then controlled the morphology of patterned semiconductors by thermally induced self-assembly method,which is based on molecule-substrate van der Waals interactions.By adjusting the annealing temperature,the unstable upper layer molecules diffused to form monolayer or bilayer films.As a result,we successfully fabricated high-quality two-dimensional organic crystalline semiconductor arrays with centimeter-scale size and tunable molecular layer number.2.We used a soft-lamination process,where a polydimethylsiloxane(PDMS)film with metal electrodes is gently transferred onto the surface of organic films,to fabricate field-effect transistor arrays.The transistors based on high-quality two-dimensional organic crystalline semiconductors demonstrate excellent charge-carrier transport behaviours and reliable performance uniformity(the maximum and average carrier mobilities are 13.40 cm²V^-1s^-1and 9.21±1.96 cm²V^-1s^-1, respectively),indicating that the method to transfer electrode arrays is utility and is expected to be applied in flexible devices.3.We further revealed that two-dimensional organic crystalline semiconductors can serve as ideal growth templates to fabricate heterojunctions with well-balanced bipolar transport behaviour.Furthermore,constructed heterostructured planar diode arrays exhibit outstanding electrical rectification,gate tunability,and light- controlled features.This demonstration is also greatly helpful for the further development of advanced optoelectronic device.