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Issue 23, 2012
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Enhancement of photo/thermal stability of organic bulk heterojunction photovoltaic devices viagold nanoparticles doping of the active layer

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Abstract

This study focuses on the crucial problem of the stability of organic photovoltaic (OPV) devices, aiming to shed light on the photo and thermal degradation mechanisms during prolonged irradiation under ambient conditions. For this purpose, the stability enhancement of bulk heterojunction OPV devices upon embedding surfactant free Au nanoparticles (NPs) into the photoactive layer is investigated by in situ time-resolved energy dispersive X-ray reflectometry (EDXR), photoluminescence (PL) and Raman spectroscopy as well as device degradation electrical measurements. It is shown that besides the improved cell efficiency attributed to plasmon absorption and scattering effects, the embedded NPs act as performance stabilizers, giving rise to enhanced structural stability and, in turn, to reduced photodegradation rate of the respective OPV devices. It is particularly clarified that, in addition to further stabilization of the polymerfullerene blend, the observed improvement can be ascribed to a NP-mediated mitigation of the photooxidation effect at the cathode–active layer interface. Our work suggests the exploitation of surfactant free NPs to be a successful approach to address aging effects in OPV devices.

Graphical abstract: Enhancement of photo/thermal stability of organic bulk heterojunction photovoltaic devices via gold nanoparticles doping of the active layer

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Article information


Submitted
18 Sep 2012
Accepted
04 Oct 2012
First published
09 Oct 2012

Nanoscale, 2012,4, 7452-7459
Article type
Paper

Enhancement of photo/thermal stability of organic bulk heterojunction photovoltaic devices via gold nanoparticles doping of the active layer

B. Paci, A. Generosi, V. R. Albertini, G. D. Spyropoulos, E. Stratakis and E. Kymakis, Nanoscale, 2012, 4, 7452
DOI: 10.1039/C2NR32799F

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