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All-Printed Ultrahigh-Responsivity MoS2 Nanosheet Photodetectors Enabled by Megasonic Exfoliation



Lee J. Richter, Lidia Kuo, Vinod Sangwan, Sonal Rangnekar, Ting-Ching Chu, David Lam, Shehao Zhu, Ruipeng Li, Julia Downing, Benjamin Luijten, Lincoln Lauhon, Mark Hersam


Printed two-dimensional materials, derived from solution-processed inks, offer scalable and cost-effective routes to mechanically flexible optoelectronics. With micron-scale control and broad processing latitude, aerosol-jet printing (AJP) is of particular interest for all-printed circuits and systems. Here, we utilize AJP to achieve ultrahigh-responsivity photodetectors consisting of well-aligned, percolating networks of semiconducting MoS2 nanosheets and graphene electrodes on flexible polyimide substrates. Ultrathin (1.2 nm thick) and high aspect ratio (1 µm lateral size) MoS2 nanosheets are obtained by electrochemical intercalation followed by megasonic atomization during AJP, which not only aerosolizes the inks but also further exfoliates the nanosheets. The incorporation of the high boiling point solvent terpineol into the MoS2 ink is critical to achieving a highly aligned and flat thin-film morphology following AJP as confirmed by grazing incidence wide angle X-ray scattering and atomic force microscopy. Following AJP, curing is achieved with photonic annealing, which yields ohmic contacts and photoactive channels with responsivities exceeding 103 A/W that outperform previously reported all-printed visible photodetectors by over 3 orders of magnitude. Megasonic exfoliation coupled with properly designed AJP ink formulations enables the superlative optoelectronic properties of ultrathin MoS2 nanosheets to be preserved and exploited for the scalable additive manufacturing of mechanically flexible optoelectronics.
Advanced Materials


two-dimensional materials, molybdenum disulfide, solution processing, liquid-phase exfoliation, percolating network, printed electronics


Richter, L. , Kuo, L. , Sangwan, V. , Rangnekar, S. , Chu, T. , Lam, D. , Zhu, S. , Li, R. , Downing, J. , Luijten, B. , Lauhon, L. and Hersam, M. (2022), All-Printed Ultrahigh-Responsivity MoS2 Nanosheet Photodetectors Enabled by Megasonic Exfoliation, Advanced Materials, [online],, (Accessed May 28, 2024)


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Created July 5, 2022, Updated April 11, 2023