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Enhanced performances in inverted small molecule solar cells by Ag nanoparticles

Fangming Jin, Bei Chu, Wenlian Li, Zisheng Su, Haifeng Zhao, and C. S. Lee

Open Access Open Access

Abstract

We demonstrate a highly efficient inverted small molecular solar cell with integration of Ag nanoparticles (NPs) into the devices. The optimized device based on thermal evaporated Ag NPs provides a power conversion efficiency (PCE) of 4.87%, which offers 33% improvement than that of the reference device without Ag NPs. Such a high efficiency is mainly attributed to the improved electrical properties by virtue of the modification of the surface of ITO with Ag NPs and the enhanced light harvesting due to localized surface plasmon resonance (LSPR). The more detail enhanced mechanism of the PCE by introduction of Ag NPs is also discussed.

© 2014 Optical Society of America

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Figures (8)
Fig. 1
Fig. 1 Normalized absorption spectra of the Ag films with different thickness on an ITO substrate.

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Fig. 2
Fig. 2 Top-view SEM images of (a) 0.5, (b) 1, (c) 2, and (d) 4 nm Ag.

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Fig. 3
Fig. 3 (a) Schematic of the inverted OSC device structure. (b) Absorption spectra of C60 and DBP films on ITO substrate. The inset is the molecular structure of DBP and C60.

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Fig. 4
Fig. 4 J–V characteristics under 1 sun, AM 1.5G illumination for optimized devices with different thickness of Ag.

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Fig. 5
Fig. 5 (a) FF, (b) Jsc under 1 sun, AM 1.5G illumination for devices with or without Ag NPs as a function of BCP thickness.

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Fig. 6
Fig. 6 (a) Dark current of the 10 nm BCP devices with or without Ag NPs. (b) J-V curves of the electron-only devices of ITO/BCP (20 nm)/C60 (100 nm)/BCP (20 nm)/AL with or without 2 nm Ag on ITO substrate.

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Fig. 7
Fig. 7 3D AFM images of (a) 1 nm Ag NPs and (b) 1nm Ag NPs covered by 5 nm BCP.

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Fig. 8
Fig. 8 Percentage enhancement in the IPCE of the devices with Ag NPs over the reference.

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Tables (1)

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Table 1 Comparison of the PCE, Jsc, FF, and VOC of the optimized OSC devices with different thickness of Ag.

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