DR. YUN LI'S GROUP
School of Electronic Science & Engineering, Nanjing University, China
"always enjoy researching"
i. 2D molecular single-crystalline semiconductors
By virtue of their unique characteristics such as light weight, high tunability, and adaptivity, two-dimensional (2D) molecular semiconductors have received great attentions for their graphene-like topological features and emerging properties. In particular, soluble organic semiconductors can be used to achieve low-cost and high-throughput manufacturing of solution-processed electronic devices. We propose a novel strategy for a rapid solution coating of 2D molecular single-crystalline semiconductors. Field-effect transistors yielded a record-high carrier mobility. Moreover, we demonstrate that our method can be applicable to the formation of 2D crystalline films using other soluble materials.
ii. artificial synapses using 2D functional materials
In the modern information era, the emerging biologically inspired systems offer an unprecedented opportunity for advanced electronic technologies, enabling a variety of prospective fields ranging from neuromorphic computing to artificial afferent nerve and prosthetics. In particular, the brain-inspired electronic devices, which demonstrate outstanding computational performance, exceptional adaptivity, and remarkable tunability, are becoming very prosperous because they possess great potential to overcome the von Neumann bottleneck and sustain the revolutionary advancement in post-Moore electronics. We seek for a fundamental breakthrough originating from revolutionary rethinking of device design and physics for advanced artificial synapses.
iii. ferroelectric memories
We propose innovative ideas to make breakthroughs in the field of ferroelectric organic field-effect transistors. So far, the electrical performance of our Fe-OFET devices possess the highest record.
iv. solution-processed organic crystals
We develop a novel method, that is solvent-vapor annealing, for the fabrication of organic semiconducting crystals. Polycrystalline thin film deposited using spin-coating from polymer/semiconductor blend can change into organic single crystals after solvent-vapor annealing. We also study the mechanism of organic crystals growth via our method.
v. patterning organic crystals
Our latest research progress on the spin-coating technique from mixture solutions is presented as a promising method to efficiently produce large organic semiconducting crystals on various substrates for high-performance OFETs. This solution-based process also has other excellent advantages, such as phase separation for self-assembled interfaces via one-step spin-coating, self-flattening of rough interfaces, and in situ purification that eliminates the impurity influences.
vi. physics of organic materials & devices
We fabricate organic devices under different conditions, evaluate the electrical performance, and investigate the charge transport behaviors and contact resistance etc. Thus, we provide deep understanding towards the basic physics of semiconducting materials and devices, aiming at the achievement of high-performance, multifunctional electronics using organic materials.