| Summary: | 碩士 === 中原大學 === 物理研究所 === 103 === The first part of this thesis aims to discuss the influence of thermal annealing on the performance of pseudo-bilayer polymer solar cells. The morphology of the poly(3-hexylthiophene) (P3HT)/ [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) layers under various thermal annealing conditions is inspected by the optical microscope, atomic force microscope (AFM) and electron beam microscope (SEM). The influence of the morphology on the device performance is also investigated. It is observed that the best performance can be achieved when the P3HT is annealed at 160℃ for 10 min. However, higher annealing temperature will lead to inferior performance when compared with the optimized one. This is because the grain size of P3HT and PCBM is too large.
The second part of this thesis aims to discuss the influence of Au film morphology on the performance of bulk heterojunction polymer solar cells. By controlling the thickness and thermal annealing conditions of Au film, varies Au film morphology can be obtained. SEM and AFM are utilized to inspect the film morphology, while the absorption and transmission spectra are used to investigate the optical properties. Current-voltage curves and incident photon-to-electron conversion efficiency are used to determine the performance of the polymer solar cells. It is observed that the device efficiency will be increased when the Au thickness is 2 – 6 nm and the thermal annealing condition is 200℃ for 10 min under oxygen.
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