The Interfacial Property Study Of Hybrid Materials Based On TiO₂Nanorods In Organic Photovoltaic Devices

In this thesis, TiO2nanorods as a cathode buffer layer were modifiedwith organic materials. These are expected to improve the deviceperformance in polymer solar cells. The studies above discusses in threeaspects as following:Firstly, polymer solar cells were fabricated by using TiO2nanorodshybrid with1,10-phenanthroline (Phen) as cathode buffer layer，whichachieve a power conversion efficiency (PCE) as high as8.12%. It wasfound that the performance of device with Phen-modified TiO2nanorodsexhibit significant improvements compared with bare TiO2. The resultwas confirmed that there was interaction between the interface of TiO2and Phen. Furthermore, hybrid TiO2:Phen film show a higher surfaceproperties and can help to extract and transport electrons.Secondly, the TiO2hybrid with alcohol-soluble fluorine (FNBr) useas cathode buffer layer to improve device performance. The resultsindicate that the increased contact area between FNBr:TiO2and activelayer is beneficial to the electron transport and collection.Finally, CPTA-modified TiO2nanorods film use as cathode bufferlayer to prepare polymer solar cells and a high PCE of8.74%is exhibited.The devices of modified TiO2with CPTA layer have lower contactresistance and better device performance.Consequently, the hybrid materials applied in organic photovoltaiccan achieve better device performance...