Study On Interface Control And Performance Of Polymer Solar Cell Electrode

In Recent years, Polymer solar cells(PSCs) continues to be of interest for its unique advantages as a potential source of renewable energy, such as low cost, easy fabrication, mechanical flexibility, large-area processing and so on. The power conversion efficiency(PCE) of single junction polymer solar cells have breaking 10% after over ten years’ pursuing. However, there are still many issues such as efficiency, spectral response range, device stability should to be improved to realize high performance PSCs.In this thesis, several spectral tuning and electrode modification method have been developed for PSCs, and their device performance are investigated by optimizing doping ratio and experimental program with the technology of spin-coating and high-vacuum evaporating.Contents and achievements are as follows:Phosphorescent doping electron extraction layer(PDEEL) was solution processed by doping Ir(ppy)3 into Bphen, and inserted into polymer solar cells with a configuration of ITO/EEL/active layer /MoO3/Al. The energy transfer efficiency was increased and interface resistance was decreased by optimizing the doping ratio and fabrication process.We try to using Ag grid transparent conductive film to replace traditional ITO electrode for flexible fabrication of PSCs. Carriers can be extracted efficiently by high conductive silver nanoparticles, which improves the hole transport efficiency. Spinning coating in flexible substrate was realized by adding Surfactant into PEDOT:PSS(PH 1000). Results shows that the device performance based on Ag grid film was better than ITO one, which provides a guideline for the manufacture of high efficiency large-scale production.The moth-eye structure was introduced onto PEDOT:PSS by soft nanoimprinting lithography,eventually the PSCs incorporating moth-eye structure was fabricated with the configuration of PET/Ag grid/PEDOT:PSS(PH1000)/ PEDOT:PSS(Clevios P VP Al 4083) /P3HT:ICBA/Li F/Al. As a result, the PCE was increased by 21% when the moth-eye structure are patterned on the PEDOT:PSS layers.