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Issue 48, 2017
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High open-circuit voltage and short-circuit current flexible polymer solar cells using ternary blends and ultrathin Ag-based transparent electrodes

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Abstract

Sputtered ultrathin silver-based multilayer electrodes have emerged as promising ITO-free candidates for lightweight, roll-to-roll processable flexible organic photovoltaics due to their high conductivity, low parasitic absorption, and excellent mechanical flexibility. However, Ag-based flexible solar cells normally yield inferior device performance when compared to conventional glass/ITO analogues. In this work, we report the use of a two-resonance tapping cavity (TRTC) based transparent electrode for achieving high-performance flexible PBDBT:ITIC solar cells. To reach optimal light harvesting without significantly sacrificing the high open-circuit voltage, the non-fullerene acceptor was partially substituted by PC71BM to transform the binary blend into a ternary blend. The combination of open-circuit voltages as high as 0.88 V with short-circuit currents close to 18 mA cm−2 leads to power conversion efficiencies higher than 11% for optimal TRTC rigid cells under AM 1.5G 1-sun illumination. Remarkably, when the TRTC was integrated onto flexible PET substrates, a 10.6% efficiency was achieved for the cells, while a robust mechanical flexibility was preserved. This is the highest efficiency value ever achieved for flexible organic solar cells.

Graphical abstract: High open-circuit voltage and short-circuit current flexible polymer solar cells using ternary blends and ultrathin Ag-based transparent electrodes

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Publication details

The article was received on 13 Oct 2017, accepted on 20 Nov 2017 and first published on 21 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA09033A
Citation: J. Mater. Chem. A, 2017,5, 25476-25484
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    High open-circuit voltage and short-circuit current flexible polymer solar cells using ternary blends and ultrathin Ag-based transparent electrodes

    Q. Liu, J. Toudert, L. Ciammaruchi, G. Martínez-Denegri and J. Martorell, J. Mater. Chem. A, 2017, 5, 25476
    DOI: 10.1039/C7TA09033A

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