Investigation of Seebeck coefficient in organic materials under a magnetic field

Due to environmental issues and energy crisis, the developments of thermoelectric (TE) materials have attracted tremendous attraction for they can convert free heat to electrical energy. To improve the performances of TE materials, we reviewed the relative researches on TE properties as well as the studies on magnetic-field effect of organic materials in recent years. Based on the researches, Seebeck coefficient is a key factor for TE performances. In this work, we applied a 50 × 10 × 10 organic lattice with lattice constant a = 1 nm. Considering the spin-related hopping, we researched Seebeck coefficient of organic materials by the master equation method. To study the performances of Seebeck coefficient, we discuss the influences of the temperature, the reorganization energy and the energetic disorder strength. Especially, when we applied a magnetic field, Seebeck coefficient first increases with the magnetic field and finally reaches a saturated value. Our investigations will be a helpful reference to understand TE properties of organic materials.