期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 24, 页码 21543-21551出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b04828
关键词
charge-transfer state; electroluminescence spectroscopy; photocurrent spectroscopy; external quantum efficiency; stability
资金
- Engineering and Physical Sciences Research Council (U.K.) (EPSRC)
- EPSRC
- Merck Chemicals
- EPSRC [EP/P006329/1] Funding Source: UKRI
Organic photovoltaics are a sustainable and cost-effective power-generation technology that may aid the move to zero-emission buildings, carbon neutral cities, and electric vehicles. While state-of-the-art organic photovoltaic devices can be encapsulated to withstand air and moisture, they are currently still susceptible to light-induced degradation, leading to a decline in the long-term efficiency of the devices. In this study, the role of ultraviolet (UV) radiation on a multilayer ,organic photovoltaic device is systematically uncovered using spectral filtering. By applying long-pass filters to remove different parts of the UV portion of the AM1.5G spectrum, two main photodegradation processes are shown to occur in the organic photovoltaic devices. A UV-activated process is found to cause a significant decrease in the photocurrent across the whole spectrum and is most likely linked to the deterioration of the charge extraction layers. In addition, a photodegradation process caused by UV-filtered sunlight is found to change the micromorphology of the bulk heterojunction material, leading to a reduction in photocurrent at high photon energies. These findings strongly suggest that the fabrication of inherently photostable organic photovoltaic devices will require the replacement of fullerene-based electron transporter materials with alternative organic semiconductors.
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