| Summary: | 碩士 === 國立成功大學 === 光電科學與工程學系 === 104 === The purpose of this study is to identify magneto-conductance (MC) under illumination in tetracene blend fullerene C60 organic diodes. Due to the closely correlation between MC and the concentration of the excited states, we control the concentration of excited state by blending C60 into tetracene. First, we found strong singlet fission in tetracene, which could be affected by the magnetic field and results in magneto-conductance. However, we detected the characteristic of MC will be varied from adding the C60. With increasing the concentration of the C60, the positive MC of C60 will appear and eventually replace the MC of single fission. In addition, the negative MC were obtained if the devices had numerous free carriers will react with triplet excitons. Then the triplet charge reaction will decreased with applied magnetic field contributing to a negative MC component. Our results demonstrate these influence by doping C60 will compete with the magneto-conductance related to singlet fission.
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