參雜奈米金粒子之PEDOT:PSS在有機太陽能與光感測器之應用

Abstract

在這個研究中，我們發現PEODT:PSS薄膜的電阻會因為加入奈米金粒子而下降，而因為當外加偏壓為零時電流密度也是零，所以我們確定這不是光電流所造成的效應，而是真的電阻下降。為了驗證這個效應，我們使用DDSCAT作為模擬軟體，模擬奈米金粒子在可見光波段的吸收頻譜。利用這個模擬來對照PEDOT:PSS薄膜的電阻對不同入射光波長的變化。因為實驗結果與模擬結果非常的相近，讓我們相信電阻下降的現象是由於奈米金粒子所產生的侷限性表面電漿效應所產生的。 另外，我們利用有機太陽能電池來驗證侷限性表面電漿效應對電阻的改變在有機太陽能電池效率上的影響。首先我們利用NI Multism 來模擬電阻因為表面電漿效應而下降的有機太陽能電池的I-V curve。在實際上作出參雜奈米金粒子的有機太陽能電池，將實驗結果與模擬結果相互映證。由於實驗結果與模擬結果十分相近，我們完成了整個LSPR(Socalized Surface Plasmon Resonance) 對有機導電高分子以及太陽能電池影響的理論。

In this research, the resistance of PEDOT:PSS film is reduced by the LSPR effect that is generated by gold nanoparticles. Because the current density of device is zero wthout applying bias voltage, the decrease of resistance is not caused by photocurrents. From the simulation result of DDSCAT, we can observe that there are a peak on the curve of the absorption factor of gold nanoparticles versus the wavelength. According to this result, we consider that the decrease of resistance relate to the LSPR effect. To further confirm the relationship between resistance and LSPR. Device 2 would be expose to visible light irradiation the wavelength from 350nm-750nm, and measured the current density with bias voltage, it can be observed that the shape of those curve are very consistent with the simulation result. The fact that the resistance of sample would be decreased by LSPR was confirmed again. To confirm the relationship between resistance ,organic solar cells and LSPR, we use NI multisim to construct the equivalent circuit of organic solar cell and simulate the I-V curve of those organic solar cells with and without gold nanoparticles, and comparing the simulation with the experiment result. Because of the consistence of the simulation and the experiment result, the theoretical framework was complete.