| 报告题目 | Theoretical investigation on magnetic field effect in organic devices |
| 报告人 | Prof. Shi-Jie Xie |
| 报告人单位 | Shandong University |
| 报告时间 | 2013-10-27 |
| 报告地点 | 合肥微尺度物质科学国家实验室九楼会议室 |
| 主办单位 | 合肥微尺度物质科学国家实验室 |
| 报告介绍 | Abstract:
Investigation on organic semiconductors (OS) has greatly been motivated by device applications such as light-emitting diodes (LED), field-effect transistors and solar cells. Recent years, organic spintronics including spin injection and transport, magnetic-field effects in these materials has become a new hot subject of research. Especially a strong magnetic-field effect (OMFE), i.e. a low magnetic field (in the scale of ) can substantially change the electroluminescence, photoluminescence, photocurrent, and electrical-injection current, is relatively easy to be obtained in an OS compared to its inorganic counterparts. The importance of OMFE is largely due to its fundamental science research and technology applications. From model and DFT simulation separately we study the charge-spin relationship of injected carriers. Some interesting phenomena are obtained. Then from phenomenological dynamics and quantum non-adiabatic calculation we study the OMFE. The theoretical calculations are well consistent to experimental data. It is found that both density and mobility response to the applied magnetic field may be responsible to the apparent organic magnetoresistance (OMAR). The internal effect of polaron and bipolaron carriers, strong electron-phonon interaction, and the hyperfine interaction of hydrogen nuclei on OMAR are discussed. |
