Reducing the variability in performance of organic solar cells containing vacuum deposited MoOx extraction layers

Graeme Williams; Hany Aziz

doi:10.1117/12.2061078

6 October 2014 Reducing the variability in performance of organic solar cells containing vacuum deposited MoO_x extraction layers

Graeme Williams, Hany Aziz

Author Affiliations +

Proceedings Volume 9184, Organic Photovoltaics XV; 91841Q (2014) https://doi.org/10.1117/12.2061078
Event: SPIE Organic Photonics + Electronics, 2014, San Diego, California, United States

Abstract

Reproducibility in efficiency and lifetime of organic solar cells (OSCs) remains a major concern, especially with the development of more complex and modern multi-layer device architectures. In this work, OSCs are studied for their efficiency and photo-stability as a function of the quality of their thermally evaporated MoO_x hole extraction layer (HEL). To this end, the characteristics of the MoO_x film are demonstrated to change with repeat evaporation runs from the same source material. These variations have strong effects on polymer OSCs (p-OSCs), with an effective halving of the power conversion efficiency after only three MoO₃ evaporation runs. In contrast, vacuum deposited small molecule OSCs (sm-OSCs) appear to be unaffected by the history of the MoO₃ source material. sm- OSCs are instead shown to be prone to large changes in efficiency as a function of the delay time in between deposition of the MoO_x HEL and subsequent photo-active materials. Increased delay time between these deposition steps is also demonstrated to decrease the sm-OSC photo-stability. The results thus emphasize subtleties in materials deposition processes that can play a significant role in obtaining reproducible and scientifically relevant data.

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Graeme Williams and Hany Aziz "Reducing the variability in performance of organic solar cells containing vacuum deposited MoO_x extraction layers", Proc. SPIE 9184, Organic Photovoltaics XV, 91841Q (6 October 2014); https://doi.org/10.1117/12.2061078

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KEYWORDS

Solar cells

Organic photovoltaics

Molecules

Polymers

Photovoltaics

Absorption

Oxides

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