CeO x ‑Mesoporous Silica Nanoparticle Antioxidants to Enhance the Stability of Organic Photovoltaic Devices

Mitigating ultraviolet exposure-induced photodegradation remains a critical challenge to the long-term stability of organic photovoltaics (OPVs). Here, we improved the stability of the OPV device by introducing an antioxidant interlayer composed of nanocrystalline ceria supported on mesoporous silic...

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Bibliographic Details
Published in:ACS applied electronic materials 2024-09, Vol.6 (9), p.6391-6400
Main Authors: Shin, Eul-Yong, Lee, Yeongseop, Kim, Ho Young, Park, So Hyun, Jun, Yongseok, Kim, Jin Young, Son, Hae Jung
Format: Article
Language:English
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Summary:Mitigating ultraviolet exposure-induced photodegradation remains a critical challenge to the long-term stability of organic photovoltaics (OPVs). Here, we improved the stability of the OPV device by introducing an antioxidant interlayer composed of nanocrystalline ceria supported on mesoporous silica nanoparticles (CeO x -MSN). The CeO x nanocrystals within the CeO x -MSN exhibited a high density of oxygen vacancies and a large ratio of Ce­(III) chemical states known to scavenge reactive oxygen species. Optimizing the particle size of the CeO x nanocrystals further enhanced the ratio of Ce­(III) states, enabling superior radical scavenging efficacy in methyl violet degradation tests compared with commercial CeO x nanostructures. The OPV performance test confirmed that the optimized CeO x -MSN (CeO x -MSN_S) can scavenge radicals without a degradation in initial performance under one-sun illumination. More importantly, the photostability test revealed that the OPV device with CeO x -MSN_S retained 73% of initial performance while the conventional device retained only 54%, corroborating the excellent radical scavenging efficacy of CeO x -MSN_S.
ISSN:2637-6113
2637-6113
DOI:10.1021/acsaelm.4c00867