The effect of incorporation of plasmonic gold (Au) nanoparticle at the interface between transparent front electrode and hole transporting layer of molybdenum trioxide is studied using bulk heterojunction organic photovoltaic cells (OPVs) of poly-3- hexylthiophene and phenyl-C61-butyric acid methyl ester (P3HT:PC61BM) fabricated in ambient air condition as a model system. The current-voltage measurement of ITO/MoO3/P3HT:PC61BM/Al and Au incorporated OPVs under AM1.5G light of intensity 1 Sun showed 16% increase in short circuit current density (JSC) and a 25% improvement in power conversion efficiency (PCE) with the incorporation of Au nanoparticles. The external quantum efficiency (EQE) measurement showed values varying from 40% to 60% over a wavelength range 350 nm to 700 nm with EQE enhancement over a broad spectral window. Scanning electron microscope studies were used to study the morphology of the Au nanoparticles made.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.