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3D Nanoscale Morphology Characterization of Ternary Organic Solar Cells. | LitMetric

3D Nanoscale Morphology Characterization of Ternary Organic Solar Cells.

Small Methods

Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique (INRS), Varennes, Québec, J3X 1S2, Canada.

Published: January 2022

AI Article Synopsis

  • Advanced techniques are being developed to investigate the 3D nanoscale structure of ternary organic solar cells (OSCs) made with a nonfullerene acceptor called PDI-DPP-PDI.
  • The study employs photoinduced force microscopy and infrared laser spectroscopy to analyze the distribution of materials in the blend film and to assess domain sizes after adding the PDI-DPP-PDI acceptor.
  • Additionally, energy-filtered transmission electron microscopy is used to visualize the morphology of ternary device cross-sections, demonstrating that the PDI-DPP-PDI acceptor helps maintain a more uniform structure and reduces charge recombination in the photoactive layer.

Article Abstract

It is highly desired to develop advanced characterization techniques to explore the 3D nanoscale morphology of the complicated blend film of ternary organic solar cells (OSCs). Here, ternary OSCs are constructed by incorporating the nonfullerene acceptor perylenediimide (PDI)-diketopyrrolopyrrole (DPP)-PDI and their morphology is characterized in depth to understand the performance variation. In particular, photoinduced force microscopy (PiFM) coupled with infrared laser spectroscopy is conducted to qualitatively study the distribution of donor and acceptors in the blend film by chemical identification and to quantitatively probe the segmentation of domains and the domain size distribution after PDI-DPP-PDI acceptor incorporation by PiFM imaging and data processing. In addition, the energy-filtered transmission electron microscopy with energy loss spectra is utilized to visualize the nanoscale morphology of ultrathin cross-sections in the configuration of the real ternary device for the first time in the field of photovoltaics. These measurements allow to "view" the surface and cross-sectional morphology and provide strong evidence that the PDI-DPP-PDI acceptor can suppress the aggregation of the fullerene molecules and generate the homogenous morphology with a higher-level of the molecularly mixed phase, which can prevent the charge recombination and stabilize the morphology of photoactive layer.

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Source
http://dx.doi.org/10.1002/smtd.202100916DOI Listing

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