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Novel cathode buffer layer of Al(acac)3 enables efficient, large area and stable semi-transparent organic solar cells

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Abstract

The electrode buffer layer plays a more crucial role in semi-transparent organic solar cells (ST-OSCs) than in opaque devices due to the additional requirements of the average visible transmittance (AVT) and color rendering index (CRI) besides the power conversion efficiency (PCE). Herein, we developed a novel cathode buffer layer aluminum(III) acetylacetonate (Al(acac)3) via mild spin-coating with a post low temperature heat treatment process. Studies show that the Al(acac)3 film possesses outstanding optical features and a suitable energy level. Namely, the absorption of an Al(acac)3 film with a thickness of 10 nm is as low as 1% and the transmittance is high, up to 95%, in the visible and near infrared regions, guaranteeing full absorption of the photoactive layer and a high CRI for ST-OSCs; and the suitable energy level ensures a smooth electron transport and collection process. By introducing the Al(acac)3 film in ST-OSCs, the devices based on PM6:Y6 yield an efficiency of 12.41%, an AVT of 25.33% (from 370 nm to 740 nm) and a CRI of 94.6. Encouragingly, the large-area ST-OSC of 100 mm2 with the Al(acac)3 buffer layer yields an efficiency of 11.28%. Further, the long-term stability of ST-OSCs shows that the device with encapsulation retains 60% of the initial PCE over 60 hours of continuous illumination. The results indicate that Al(acac)3 is a promising cathode buffer layer for fabricating efficient, large area and stable semi-transparent organic solar cells.

Graphical abstract: Novel cathode buffer layer of Al(acac)3 enables efficient, large area and stable semi-transparent organic solar cells

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Article information


Submitted
31 Mar 2020
Accepted
01 May 2020
First published
06 May 2020

Mater. Chem. Front., 2020, Advance Article
Article type
Research Article

Novel cathode buffer layer of Al(acac)3 enables efficient, large area and stable semi-transparent organic solar cells

Y. Bai, C. Zhao, R. Shi, J. Wang, F. Wang, T. Hayat, A. Alsaedi and Z. Tan, Mater. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QM00198H

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