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Unsymmetrical Squaraine Dye-Based Organic Photodetector Exhibiting Enhanced Near-Infrared Sensitivity

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dc.contributor.author SOMASHEKHARAPPA, G M
dc.contributor.author GOVIND, C
dc.contributor.author PULIKODAN, V
dc.contributor.author PAUL, M
dc.contributor.author NAMBOOTHIRY, M A G
dc.contributor.author DAS, S
dc.contributor.author KARUNAKARAN, V
dc.date.accessioned 2021-04-16T08:40:43Z
dc.date.available 2021-04-16T08:40:43Z
dc.date.issued 2020-09-10
dc.identifier.citation The Journal of Physical Chemistry C; 124(39):21730–21739 en_US
dc.identifier.uri https://pubs.acs.org/doi/10.1021/acs.jpcc.0c06497
dc.identifier.uri http://hdl.handle.net/123456789/3710
dc.description.abstract An unsymmetrical squaraine (SQ) derivative containing anthracene and phenyl hydrazine (ANPHSQ) units linked to the central SQ was synthesized and used as electron donors in bulk heterojunction photovoltaic mode organic photodetectors (OPD), containing PCBM as the electron acceptor. Although the ANPHSQ exhibited a strong narrow band in the near infrared peaking at ∼760 nm in solution, the OPD constructed with this dye exhibited a broad spectral response extending to 950 nm. The enhanced sensitivity in the long wavelength region could be attributed to formation of ANPHSQ aggregates within the devices. A photocurrent of 1.3 mA/cm2, almost 3–5 orders of magnitude larger than the dark current (∼50 nA/cm2), was observed in the presence of light at −1 V bias condition. Devices showed an increase in external quantum efficiency from ∼4 to ∼12% as the bias varied from 0 to −1 V. At a reverse bias of −1 V, the device with a ANPHSQ exhibited a maximum shot-noise-limited specific detectivity of 6 × 1011 cm Hz1/2 W–1 (Jones) @ 840 nm with an ultrafast photoresponse in the range of ∼15 ns. The study of relaxation dynamics of the ANPHSQ excited state using femtosecond pump–probe spectroscopy and time-correlated single-photon counting indicated efficient charge transfer between the excited state of ANPHSQ and PCBM. en_US
dc.language.iso en en_US
dc.publisher American Chemical Society en_US
dc.subject organic photodetector en_US
dc.subject infrared sensitivity en_US
dc.subject organic photodetectors en_US
dc.title Unsymmetrical Squaraine Dye-Based Organic Photodetector Exhibiting Enhanced Near-Infrared Sensitivity en_US
dc.type Article en_US


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  • 2020
    Research articles authored by NIIST researchers published in 2020

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