In this article, Magneto-Seebeck effect was studied by applying P3HT/PCBM bulk heterojunction devices. We found that illumination and magnetic field can improve the Seebeck coefficient of the pure P3HT device. Our magneto-photocurrent (MPC) effects indicate that the singlet and triplet ratios in these devices can be changed by external magnetic field. Furthermore, the Seebeck coefficient under light was measured as changing temperature and magnetic field. Based on the experimental results and theoretical models, we conclude that the change of singlet and triplet ratios caused by magnetic field influences carrier concentration, and affects the thermoelectric properties of organic semiconductor materials and devices. In addition, the impact of magnetic fields on Seebeck coefficient in our experiments differs from the traditional magnetic field effects, which becomes more conspicuous as temperatures rises at high temperature. Our study can further develop magnetic-thermoelectric effects, and contribute to presenting new strategies about magnetic-photo-thermoelectric coupling.

在本文中，通过应用P3HT / PCBM体异质结器件研究了磁塞贝克效应。我们发现，光照和磁场可以提高纯P3HT器件的塞贝克系数。我们的磁光电流（ MPC ）效应表明，这些器件中的单重态和三重态比率可以通过外部磁场改变。此外，在光下的塞贝克系数被测量为变化的温度和磁场。根据实验结果和理论模型，我们得出结论，磁场引起的单重态和三重态比率的变化会影响载流子浓度，并影响有机半导体材料和器件的热电性能。另外，在我们的实验中，磁场对塞贝克系数的影响与传统的磁场效应不同，传统的磁场效应随着温度在高温下升高而变得更加明显。我们的研究可以进一步发展磁热电效应，并有助于提出有关磁光热电耦合的新策略。