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The role of Au nanorods in highly efficient inverted low bandgap polymer solar cells
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Gold nanorods (Au NRs) are synthesized and doped into titanium dioxide (TiO2) buffer layer of polymer
solar cells based on low bandgap polymer semiconductor, and the photovoltaic properties of devices
doping with different amount of Au NRs are measured and investigated. Enhanced light trapping has been realized through localized surface plasmon resonance and scattering effect of Au NRs, resulting in improved short circuit current density (Jsc) while maintaining the corresponding open-circuit voltage (Voc). Also, higher electrical conductivity of TiO2 layer has been obtained owing to introduction of high-conductivity Au NRs, which contributes to the improved Jsc as well. The maximum power conversion efficiency of 6.72% is obtained while introducing 1.5 wt. % Au NRs into the TiO2, leading to a 15.5% enhancement compared with the control devices.
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