Issue 18, 2023

Fused polycyclic lactam-based π-conjugated polymers for efficient nonfullerene organic solar cells

Abstract

The development of high-performance wide-bandgap polymers has attracted significant attention in recent non-fullerene organic solar cells (NF-OSCs) research, as the expansion of the options of polymer donors that are appropriately matched with nonfullerene acceptors can lead to the further improvement of photovoltaic properties. In this study, two wide-bandgap π-conjugated polymers, namely, P(TPTI-BDT) and P(2DTP-BDT), based on fused pentacyclic bis-lactam and dimeric bis-lactam units, were prepared and used as the donor materials for NF-OSCs with IT-4F as the acceptor. The NF-OSCs based on the P(TPTI-BDT):IT-4F blends outperformed the corresponding P(2DTP-BDT):IT-4F-based devices, achieving high power conversion efficiencies of up to 11.7% without processing additives or post-treatments. Further investigation of the thin-film morphologies using X-ray diffraction and transmission electron microscopy revealed that both P(TPTI-BDT) and P(2DTP-BDT) adopted preferential face-on molecular orientations and formed finely nano-segregated bulk-heterojunction morphologies when blended with IT-4F.

Graphical abstract: Fused polycyclic lactam-based π-conjugated polymers for efficient nonfullerene organic solar cells

Supplementary files

Article information

Article type
Paper
Submitted
23 Feb 2023
Accepted
20 Apr 2023
First published
20 Apr 2023

J. Mater. Chem. A, 2023,11, 9840-9845

Author version available

Fused polycyclic lactam-based π-conjugated polymers for efficient nonfullerene organic solar cells

N. Sato, S. Hwang, Y. Tsuchii and T. Yasuda, J. Mater. Chem. A, 2023, 11, 9840 DOI: 10.1039/D3TA01127E

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