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Issue 19, 2019
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Efficient light harvesting with a nanostructured organic electron-transporting layer in perovskite solar cells

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Abstract

Nanostructures have proved to be advantageous in light harvesting, improving the power conversion efficiency (PCE) of photovoltaic devices. However, the reported light-harvesting nanostructures all require extra processing beyond that for device fabrication, with multiple steps for nano-patterned structures or plasmonic nano-particles. Here we synthesized a conjugated polymer PFPDI which could simply form a nanostructured film on perovskite by spin coating. PFPDI possesses a perylene diimide-based backbone and phosphite ester pendants, which makes it a robust electron-transporting material (ETM) in perovskite solar cells. Furthermore, the perovskite solar cells with PFPDI as the electron-transporting layer (ETL) exhibited a higher light-harvesting efficiency compared to the standard phenyl-C61-butyric acid methyl ester (PCBM) devices. The JSC of the PFPDI device was enhanced from 19.71 mA cm−2 to 23.43 mA cm−2. SEM images and reflectance spectra confirmed that the PFPDI formed ditch-like nanostructures on perovskite film and induced a better light-harvesting efficiency. Further research indicated that the interaction of P[double bond, length as m-dash]O with Pb was essential to the formation of the nanostructures of PFPDI on perovskite. Therefore, our work not only offers an efficient organic ETM, but also opens up new horizons for simply constructing nanostructures with light-harvesting ability in photovoltaic devices.

Graphical abstract: Efficient light harvesting with a nanostructured organic electron-transporting layer in perovskite solar cells

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Publication details

The article was received on 09 Apr 2019, accepted on 18 Apr 2019 and first published on 22 Apr 2019


Article type: Communication
DOI: 10.1039/C9NR03030A
Nanoscale, 2019,11, 9281-9286

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    Efficient light harvesting with a nanostructured organic electron-transporting layer in perovskite solar cells

    L. Wan, W. Zhang, Y. Wu, X. Li, C. Song, Y. He, W. Zhang and J. Fang, Nanoscale, 2019, 11, 9281
    DOI: 10.1039/C9NR03030A

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