The inverted organic solar cell (IOSC) devices with different concentration ratios of nanoparticles In2S3 have been studied under local solar spectrums (sunny and cloudy conditions) in Malaysia as compared to that of AM1.5G. The J-V curves of encapsulated IOSC devices were measured on-site using Ivium Potentialstat and local spectral irradiances were acquired concurrently using AVANTES spectrometer. Despite average photon energy (APE) of both local sunny (1.604 ± 0.010 eV) and AM1.5G conditions (1.603 eV) having almost the same values, the variation in their peak regions is significant in which local sunny condition shows spectral broadening effect with 450 – 640 nm as compared to AM1.5G condition with 447 – 588 nm. The spectral broadening under sunny condition and the bluish-enhancement under cloudy condition have matched well with the light absorption band of the IOSC device. Therefore, power conversion efficiency (PCE) of IOSC devices under local sunny condition relative to AM1.5G condition shows the substantial improvement with gain of 26.4 – 50.0 %, while the devices operate at even higher PCE under cloudy condition with gain of 31.8 – 68.8%.
Keywords inverted organic solar cell, local solar irradiance, average photon energy, power conversion efficiency, standard AM 1.5 G spectrum, organic photovoltaic