Role of Morphology and Förster Resonance Energy Transfer in Ternary Blend Organic Solar Cells

Mohapatra, AA and Shivanna, R and Podapangi, S and Hinderhofer, A and Dar, MI and Maity, N and Schreiber, F and Sadhanala, A and Friend, RH and Patil, S (2020) Role of Morphology and Förster Resonance Energy Transfer in Ternary Blend Organic Solar Cells. In: ACS Applied Energy Materials . (In Press)

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Abstract

Organic solar cells (OSCs) fabricated from ternary blend thin film absorbers are designed to maximize the range of absorption in the solar spectrum and thus increase the short-circuit current density (JSC) of the device. Herein, we report OSCs formed with two different compositions of ternary blend thin films comprising two electron donors and one acceptor, namely, PTB7-Th/PCDTBT/IT4F and PTB7-Th/PBDB-T/IT4F. We evaluate the role of Förster resonance energy transfer (FRET) and blend morphology to achieve composition-dependent device performance. We observed �10 increment in JSC for both the ternary blends as compared to that for the PTB7-Th:IT4F binary blend, resulting in an enhanced power conversion efficiency (PCE) up to 10.34 for the PTB7-Th:PBDB-T:IT4F blend. We provide evidence that the two foremost parameters that control the PCE are blend morphology and FRET between donor components. The improved exciton generation rate for PCDTBT-based ternary blends was achieved, suggesting effective contribution of FRET toward enhanced device photocurrent, whereas the PBDB-T-based ternary blend excelled mainly due to suppressed carrier recombination as a result of favorable orientation with PTB7-Th/IT4F. ©

Item Type:	Journal Article
Publication:	ACS Applied Energy Materials
Publisher:	American Chemical Society
Additional Information:	Copyright to this article belongs to American Chemical Society
Keywords:	Absorption spectroscopy; Charge carriers; Conversion efficiency; Energy transfer; Forster resonance energy transfer; Morphology; Photocurrents; Solar absorbers; Thin film circuits; Thin films, Blend morphology; Carrier recombination; Device performance; Electron donors; Exciton generation; Power conversion efficiencies; Resonance energy transfer; Ternary blends, Organic solar cells
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	08 Jan 2021 09:54
Last Modified:	08 Jan 2021 09:54
URI:	http://eprints.iisc.ac.in/id/eprint/67556

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