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Reproducible, High Performance Fully Printed Photodiodes on Flexible Substrates through the Use of a Polyethylenimine Interlayer

  • Matteo Cesarini
    Matteo Cesarini
    Center for Nano Science and Technology @PoliMi, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
  • Biagio Brigante
    Biagio Brigante
    Center for Nano Science and Technology @PoliMi, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
  • Mario Caironi
    Mario Caironi
    Center for Nano Science and Technology @PoliMi, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
  • , and 
  • Dario Natali*
    Dario Natali
    Center for Nano Science and Technology @PoliMi, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
    Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, L. da Vinci, 32, 20133 Milano, Italy
    *E-mail: [email protected]
    More by Dario Natali
Cite this: ACS Appl. Mater. Interfaces 2018, 10, 38, 32380–32386
Publication Date (Web):September 4, 2018
Copyright © 2018 American Chemical Society

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    Abstract Image

    This paper investigates with a statistical analysis the issue of performance reproducibility and optimization in fully inkjet-printed organic photodetectors on flexible substrates. The most crucial process step to obtain reproducible, well performing devices with a high process yield turns out to be the printing of the thin polyethylenimine interlayer used as a surface modifier for the bottom electrode. Controlling solution composition and deposition parameters for this layer, a 57 nA cm–2 mean reverse dark current was achieved, with an outstanding standard deviation as low as 15 nA cm–2, with dramatic improvements in process yield (from less than 20% to over 90%). Device performance in terms of dark currents, EQE (from 50% up to 90% at 525 nm, depending on process), and rectification (ratio between forward current and reverse current over 104 and reaching 105 in the best cases) is among the best for fully printed detectors. Furthermore, the importance of relative humidity control in the deposition environment during the interlayer printing on device characteristics is reported, indicating the processing conditions optimal for scaling to mass manufacturing. The overall interlayer optimization approach was applied to a process using widely adopted materials in the organic optoelectronics field, and thus retains relevance on a broad range.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.8b07542.

    • AFM and surface profile of PEI films, effect of drop spacing and layer number in interlayer deposition in PEIH2O, single solvent and multiple solvent general comparison, effect of relative humidity during PEI printing (PDF)

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