有機太陽能電池的研究發展之下，為了提升元件效率，其中的改善方法之ㄧ，即是讓元件的主動層厚度增加以吸收較多的光子，因而產生較多的激子，這時激子的擴散長度及生命期就愈顯重要，如何讓激子的擴散長度增加和载子的生命期變長就是本論文所要研究的重點。
目前已知的是摻雜金屬錯合物在有機材料中，可以讓激子因為重原子的效應(Heavy atom effect)，發生自旋軌道耦合(Spin-orbit coupling )，使得單重態激子可以經由內部換效應跨越到三重態，生命期也跟著增加。而本論文的研究在參雜了PtOEP金屬錯合物後，藉由量測螢光生命期發現，螢光生命期有變短的現象，顯示三重態激子的增加；而在雙層(Bilayer)有機太陽能元件中，在後退火30分鐘，溫度180度C下，明顯看到摻雜PtOEP的光電流和光電轉換效益有增加，證實激子的擴散長度確實有增加。另外，與此實驗對照下，我們也嘗試用Ir(mppy)3的綠光放光材料和清大化學所季昀老師實驗室所合成的鏀金屬錯合物來比較。

Organic solar cells have been research in recent years. In order to raise short circuit current (Jsc) and Power consumption efficiency (PCE), One of the improve method is to add the active layer thickness. That will result in more photons absorption and product more excitons. Then the exciton diffusion length and lifetime have become important. These are major discussions in the thesis.
It is famous to dope metal complexes in conjugate polymer. Heavy metal effect cause excitons have spin-orbit coupling. Singlet excitons can be cross to the triplet state by intersystem crossing. Excitons lifetime will increase obviously. After we doped PtOEP in conjugate polymer and device, it find the decreasing exciton lifetime. In bilayer devices , it can find the exciton diffusion length increase. The bilayer devices fabrication was post anneal 30mins and in 180 degrees. The photocurrent and PCE also increase in evidence. Otherwise, we try other materials , like Ir(mppy)3 and Natural Ru(II) which was compound in Chi Yun laboratory of National Tsing Hua University , to compare with PtOEP .

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