1 research outputs found
Improved Performance of ZnO/Polymer Hybrid Photovoltaic Devices by Combining Metal Oxide Doping and Interfacial Modification
Photoinduced
charge separation at hybrid organic–inorganic
interfaces is poorly understood and challenging to control. We investigate
charge separation at a model system of ZnO/polyÂ(3-hexylthiophene)
(P3HT) and employ Sr doping of ZnO and phenyl-C61-butyric acid (PCBA)
self-assembled modification to study and enhance the charge separation
efficiency. We find that doping alone lowers the efficiency of charge
separation due to the introduction of defect states at the oxide surface.
However, with the combination of doping and molecular modification,
charge separation efficiency is significantly enhanced due to the
passivation of interfacial traps and improved modifier coverage. This
demonstrates a complex noncumulative effect of doping and surface
modification and shows that with the correct choice of metal oxide
dopant and organic modifier, a poorly performing hybrid interface
can be turned into an efficient one