奈米結構應用於高分子太陽能電池與溶劑修飾之PEDOT:PSS應用於混合型太陽能電池

Abstract

由於導電高分子材料的發現，將有機高分子帶入了電子領域，也給予太陽能電池有新材料的選擇，有機太陽能電池因而發展。此論文主要目的是，以簡單的方式，提升有機太陽能電池與混合型太陽能電池之光電轉換效率。內容可分為兩部分探討：(1)以奈米結構化ITO電極，來增加有機高分子太陽能電池之短路電流。(2)以溶劑修飾PEDOT：PSS，藉此降低其電阻，並應用於混合型太陽能電池。 (1) 以奈米壓印製造奈米結構化ITO電極，並應用於P3HT:PCBM有機高分子太陽能電池。因奈米結構造成光散射，使電池元件之短路電流從7.07 (mAm/cm2 )增加到10.76 (mAm/cm2 )，效率從2.75%增加到3.92%。 (2) 使用DMSO及甲醇以添加法與浸泡法對PEDOT：PSS做處理，來降低其電阻。而將兩種方法結合，並用於混合型太陽能電池中，使元件串聯電阻明顯下降與填充因子顯著提升，讓光電轉換效率而得以增加。 本實驗以簡易的奈米壓印技術，製造光捕捉奈米結構化ITO，並應用於有機高分子太陽能電池，以及簡單的溶劑處理PEDOT：PSS，降低混合型太陽能電池之串聯電阻與提升其填充因子。因此太陽能電池的效率有明顯之增益。

Since the discovery of conducting polymers, organic electronics has been speedily promoted. Moreover, it gives new material choices for solar cells and organic photovoltaics, which promotes emerging of new photovoltaic devices. This thesis aims to enhance the power conversion efficiency of polymer solar cells and hybrid solar cells. The content is divided into two parts: (1) to enhance the short circuit current of polymer solar cells by using nanostructures. (2) to reduce the resistance of PEDOT:PSS of hybrid solar cells with solvent treatment. The major results are summarized as follows: (1) The nano-patterned ITO layer was fabricated by using nanoimprint lithography on the P3HT:PCBM based polymer solar cells. The conversion efficiency of the solar cells was found to increase from 2.75% to 3.92%. The improvement in efficiency was mostly due to the enhanced light scattering and absorption by the nano-patterned ITO layer which increase of the short circuit current from 7.07 (mA/cm2 ) to 10.76 (mA/cm2 ). (2) A noticeable decrease in resistance of PEDOT:PSS was found after traeting with DMSO and methanol using the dipping method or the mixing method. The combinations of these two methods allow us to and to greatly enhance the FF and power conversion efficiency of hybrid solar cells by reducing the Rs significantly. The work in this thesis provides economic ways, such as NIL and simple solvent treatments, to greatly improve the power conversion efficiency of polymer and hybrid solar cells.