Tuning the charge transport and photo-physical behavior in hybrid poly(3-hexylthiophene) and silver sulfide quantum dot based nanocomposite devices

Khan, Motiur Rahman and Jagtap, Amardeep M and Rao, KSR Koteswara and Menon, R (2019) Tuning the charge transport and photo-physical behavior in hybrid poly(3-hexylthiophene) and silver sulfide quantum dot based nanocomposite devices. In: ORGANIC ELECTRONICS, 69 . pp. 361-366.

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Abstract

The charge transport properties are studied in hybrid thin films composed of poly (3-hexylthiophene) polymer (P3HT) and silver sulfide (Ag2S) quantum dots (QDs) by temperature and photo-dependent current-voltage (J-V) characteristics. A complete reversal in J-V characteristics is observed in ITO/Nanocomposite/Au devices as the QDs' concentration in the polymer matrix reaches to 50 wt percentage (wt. %). A detailed study of charge injection through ITO exhibits a transition in transport mechanism from direct tunnelling to thermionic emission with increasing QDs up to 20 wt % and further governed by space charge limited conduction for 50 and 80 wt % devices. Charge injection through Au shows the transition from Poole-Frenkel to thermionic emission as the QDs surpasses 10 wt % in polymer matrix. The effect of injection barrier and charge transfer phenomena on the transport properties are discussed in details by photoluminescence and photocurrent measurements.

Item Type:	Journal Article
Publication:	ORGANIC ELECTRONICS
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	copyright for this article belongs to ELSEVIER SCIENCE BV
Keywords:	Conjugated polymer; Quantum dot; Charge transport; Photocurrent; Non-linear; Nanocomposite
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	22 Apr 2021 11:12
Last Modified:	22 Apr 2021 11:12
URI:	http://eprints.iisc.ac.in/id/eprint/62863

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