Center for Functional Nanomaterials Seminar

Center for Functional Nanomaterials Seminar

Interaction between Charge Transfer States in Semiconducting Materials Studied by Magnetic Field Effects

Mingxing Li
Department of Materials Science and Engineering
University of Tennessee-Knoxville, Tennessee

Monday, April 25, 2016
1:30 p.m.
Bldg. 735 – 1st floor conference room


Charge transfer states are interfacial charge pairs residing at the donor–acceptor heterointerface. Experimental evidence shows that they are crucial for the OPV and OLED performances. This presentation reports the experimental studies on the interaction between charge transfer states by using the magnetic field effects. The performance of magnetic field effects, illustrated by the amplitude and line-shape, demonstrates the interactions between intermolecular charge transfer states, between photo-generated charge transfer states and magnetized charge transfer states, and between the intramolecular charge transfer states and d electrons. In addition, this presentation also describes the fundamental studies on organo-metal halide perovskite (OMHP) semiconductors. On one hand, the experimental results based on magnetic field effects indicate the interaction between the electron-hole pairs and free carriers in OMHP, which is crucial for improving the performance of OMHP solar cells. On the other hand, a magneto-electric coupling is found at the interface between OMHP and Co, indicating a possibility for realizing the OMHP-based spintronics application. In summary, this presentation intends to present the recent experimental progress on studying the interaction between charge transfer states in semiconducting materials by taking advantage of magnetic field effects.