奈米結構對有機太陽能電池特性之影響

The influence of nanostructure on the organic solar cells

林慶怡(Ching-Yi Lin)

指導教授 ： 趙宇強

中原大學/理學院/物理研究所/碩士(2015年)

https://doi.org/10.6840/cycu201500578

摘要

本論文研究一主旨在探討藉由熱退火方式對偽雙層有機太陽能電池之影響。本研究以光學顯微鏡、原子力顯微鏡與電子顯微鏡來觀察P3HT/PCBM各層經各種熱退火條件所帶來之影響。熱退火條件對有機太陽能電池效率之影響也是本研究所探討的對象。本研究發現當P3HT經10分鐘於160℃之熱退火後有較好的太陽能電池轉換效率。但隨著P3HT熱退火溫度持續增加，反而會得到較不好的轉換效率。這是由於在特定熱退火條件之下，PCBM後會形成嚴重的結晶情形。因此，本研究指出過度的結晶於P3HT與PCBM層對雙層有機太陽能電池是不好的。
本論文研究二主旨在探討在ITO基板上金薄膜表面形貌對有機太陽能電池效率之影響。本研究試圖以各種金薄膜厚度與是否經熱退火這兩個條件來控制表面形貌，並以掃描式電子顯微鏡與原子力顯微鏡觀察。本研究以吸收光譜及穿透光譜觀察不同厚度之金薄膜經熱退火與否對光學特性之影響。本研究將以電流-電壓圖及外部量子效率觀察不同厚度之薄膜金經熱退火與否對有機太陽能電池效率之影響。研究結果指出，經過10分鐘於氧氣中200℃熱退火之金薄膜形成島狀聚集，在厚度2 nm至6 nm的條件下有機太陽能電池效率是提升的。

關鍵字

奈米結構；有機太陽能電池

並列摘要

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.

並列關鍵字

nanostructure ； organic solar cells

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