Metal oxide-embedded carbon-based materials for polymer solar cells and X-ray detectors

Area of Science:

• Materials Science
• Organic Electronics
• Nanotechnology

Background:

• Bulk heterojunction (BHJ) polymer solar cells (PSCs) and X-ray photodetectors are crucial organic electronic devices.
• Improving charge carrier dynamics and exciton dissociation is key to enhancing device performance.
• Hybrid nanoparticles offer a promising route to engineer active layer properties.

Purpose of the Study:

• To investigate the impact of NiO@rGO and NiO@CNT hybrid nanoparticles on the performance of BHJ PSCs and X-ray photodetectors.
• To analyze how these nanoparticles influence the morphology and charge transport characteristics of the active layers.
• To determine the optimal weight ratios for incorporating these hybrid nanoparticles.

Main Methods:

• Fabrication of BHJ solar cells and X-ray photodetectors with varying weight ratios of NiO@rGO and NiO@CNT in the active layer.
• Microscopic analysis to study the structural effects of nanoparticle incorporation.
• Characterization of device performance, including power conversion efficiency (PCE) for solar cells and sensitivity for photodetectors.
• Evaluation of charge carrier capacity and exciton dissociation properties.

Main Results:

• Incorporation of NiO@rGO and NiO@CNT significantly enhanced charge carrier capacities and exciton dissociation compared to conventional matrices.
• The NiO@CNT based BHJ solar cell achieved a maximum PCE of 6.42%, outperforming the pure PCDTBT:PCBM device (4.35%).
• NiO@CNT demonstrated superior performance as an X-ray detector material, reaching a sensitivity of 1.92 mA Gy^-1 cm^-2.

Conclusions:

• NiO@CNT and NiO@rGO hybrid nanoparticles effectively improve the performance of organic electronic devices.
• Enhanced interfacial properties and charge transport are attributed to the integration of these hybrid nanoparticles.
• This study underscores the potential of novel hybrid nanoparticles for advancing PSCs and X-ray photodetectors.