Study On The Performances Of Polymer Solar Cells Modified By Ag Nanoparticles And Ferrocene Derivatives

Polymer solar cells?PSCs?and perovskite solar cells?PvSCs?have attracted extensive attention due to their simple preparation,low cost and flexibility.Although the power conversion efficiency?PCE?and stability of PSCs and PvSCs have been greatly developed,yet further developing performance is still very important for solar cells to realize the industry application.It is an effective strategy to improve PCEs of cells using surface plasmon resonance effect to improve absorption of the active layer.In this thesis,Ag nanoparticles?NPs?were respectively incorporated into electron transport layer of PSCs and PvSCs,which greatly increase PCEs of cells.Based on the inferior stability of noble NPs modified PSCs,using ferrocenedicarboxylic acid?FDA?modified Ag NPs can obviously improve the humidity and UV stability of cells.The main contents of this thesis are as follows:?1?Ag NPs doped AZO?AZO:Ag?film as electron transport layer was prepared through spin-coating mixed solution with Ag NPs and AZO percursor.Using localized surface plasmon resonance?LSPR?effect of Ag NPs,PTB7-Th:PC₇₁BM based PSCs with AZO:Ag obtained 10.2%of PCE,which was greatly larger than that?9.08%?of PSCs with pure AZO layer.The enhanced PCEs of AZO:Ag based PSCs is attributed to enhance light absorption of the active layer and electron transport ability.However,LSPR based PSCs showed inferior stability compared to reference PSCs,which is ascribed to the diffusion of Ag atoms,resulting in the deterioration of the active layer and its interface.FDA modified AZO:Ag electron transport layer can greatly improve UV stability and moisture resistance of PSCs.PSCs with FDA modified AZO:Ag still keep 50%and 53%of the original PCEs ageing for 13h UV exposure and 9 month in air under RH 10%,which are obviously higher than that?31%and 35%?of reference PSCs with AZO:Ag.?2?SnO₂ compared to TiO₂ show better electron mobility with wide band gap?3.6eV?,which is a kind of good electron transport material for photovoltaic devices.SnO₂ electron transport layer was fabricated using low-temperature solution method by spin-coating SnO₂ precursor solution which was prepared using ethylene glycol methyl ether and ethanolamine as blended solvent.SnO₂ based perovskite solar cells reached 13.6%,which was higher than PCE?12.5%?of TiO₂ based cells.In the meantime,Ag NPs was doped into SnO₂ precursor solution to further fabricate complicated electron transport layer.The PCE of SnO₂:Ag based PvSCs was increased to 15.2%from 13.6%of reference PvSCs with SnO₂,which is attributed to enhanced absorption of the active layer and improved carrier transport capacity of SnO₂:Ag electron transport layer.