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Manipulation of PBDT-DTNT:PCBM Photoactive Layers for Stability Increment by Core-Shell and Core-Mantle-Shell Supramolecules

Abstract

Two types of core-shell and core-mantle-shell supramolecules were designed based on grafted-carbon nanotubes (CNTs) and poly[benzodithiophene-bis(decyltetradecyl-thien) naphthothiadiazole] (PBDT-DTNT) chains and employed in the active layers of PBDT-DTNT:phenyl-C61-butyric acid methyl ester (PC71BM) solar cells to stabilize morphology and performance. These nano-hybrids were composed of CNT-g-poly(3-dodecylthiophene) (PDDT)/PBDT-DTNT and CNT-g-polyaniline (PANI)/PBDT-DTNT precursors, respectively. The overall diameter of core-shell and core-mantle-shell nanostructures ranged in 85–95 and 110–120 nm, respectively. In contrast to the pure CNT (3.55%), the pre-designed core (CNT)-shell (PBDT-DTNT) and core (CNT)-mantle (PANI)-shell (PBDT-DTNT) nanostructures considerably affected the photovoltaic characteristics and the efficacies of 4.83 and 6.71% were acquired, respectively. From the pure CNT-based photovoltaics towards the core-shell and core-mantle-shell modified systems, the slopes of decreasing curves of short circuit current density (Jsc), fill factor (FF), open circuit voltage (Voc) and power conversion efficiency (PCE) versus aging time became slower, approving a higher stability in the well-functioned photovoltaic devices. The core-mantle-shell nanostructures not only largely phase separated and absorbed at the stronger red-shifted wavelengths, but also further stabilized the device morphology and performance. Within 1 month aging, the characteristics of (9.69 mA/cm2, 52%, 0.57 V, 2.3 × 10–6 cm2/V.s, 4.8 × 10–5 cm2/V.s, 806 Ω.cm2 and 2.87%) and (12.74 mA/cm2, 64%, 0.64 V, 8.4 × 10–5 cm2/V.s, 9.7 × 10–4 cm2/V.s, 543 Ω.cm2 and 5.21%) were retained for core-shell and core-mantle-shell based systems, respectively.

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Supplementary files

Article information


Submitted
06 Nov 2019
Accepted
06 Feb 2020
First published
07 Feb 2020

New J. Chem., 2020, Accepted Manuscript
Article type
Paper

Manipulation of PBDT-DTNT:PCBM Photoactive Layers for Stability Increment by Core-Shell and Core-Mantle-Shell Supramolecules

J. Pan, Z. Jia, Y. Chang, Y. Hu, G. Zhang and S. Agbolaghi, New J. Chem., 2020, Accepted Manuscript , DOI: 10.1039/C9NJ05566E

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