利用超寬頻激發探測光譜研究電漿子銅銦鎵硒太陽能電池之載子超快動力學

Abstract

為了提升太陽能電池效率，奈米結構是一個很好的選擇。此論文的研究方向是利用金屬奈米粒子的的特性─表面電漿共振(SPR)，進行對銅銦鎵硒薄膜太陽能電池的效率提升。另外，我們也提出了許多數據支持效率的增加，例如:Voc、Jsc、FF與EQE。金屬粒子的擺放位置也是一大關鍵，不同位置對應到不同機制，最後我們發現將金屬粒子置於吸收層與緩衝層之間有最大的效率轉換，尤其是在高角度(>40o)。因此本碩論的超快量測皆是針對金奈米粒子放在CIGS層上方的情況。最後，我們利用超寬頻激發─探測系統來佐證我們在元件特性上看到的表現。在短波長是光致漂白效應，而長波長附近則是由光致吸收轉光致漂白，當有金奈米粒子放在CIGS層上方時，在LSPR的區域有效的增加光致漂白的效應，使得生命週期變長，另外LSPR亦可減少表面復合的機會，使得光電子可以更容易的被萃取出來。

It is a good way with nanostructure improving the efficiency of solar cells. In this work, we demonstrate SPR effect of metal nanoparticles can enhance the efficiency. However, we also propose some data to prove what we said, for example: Voc、Jsc、FF and EQE. And the location of gold nanoparticles is a keypoint, Correspond to different mechanisms in different locations, and finally, the interface of CdS/CIGS has been found to be the suitable choice for Au NPs distribution, especially at the high angle(>40o). We research the case of the interface of CdS/CIGS in my work. Finally, the major benefits of the LSPR in visible wavelength have been investigated by ultrabroadband pump-probe spectroscopy. The Au NPS has been made it more longer life time so that we can easier to extract the carrier from the solar cell. It contribute to the Photo Bleaching.And the LSPR reduce the surface recombination to get more carrier.