A copolymer comprising 1,4‐diketopyrrolo[3,4‐c]pyrrole (DPP) and thieno[3,2‐b]thiophene moieties, PDBT‐co‐TT, shows high hole mobility of up to 0.94 cm2 V−1 s−1 in organic thin‐film transistors. The strong intermolecular interactions originated from π‐π stacking and donor‐acceptor interaction lead to the formation of interconnected polymer networks having an ordered lamellar structure, which have established highly efficient pathways for charge carrier transport.

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A donor-acceptor polymer semiconductor, PDQT, comprising diketopyrrolopyrrole (DPP) and β-unsubstituted quaterthiophene (QT) for organic thin film transistors (OTFTs) is reported. This polymer forms ordered layer-by-layer lamellar packing with an edge-on orientation in thin films even without thermal annealing. The strong intermolecular interactions arising from the fused aromatic DPP moiety and the DPP-QT donor-acceptor interaction facilitate the spontaneous self-assembly of the polymer chains into close proximity and form a large π-π overlap, which are favorable for intermolecular charge hopping. The well-interconnected crystalline grains form efficient intergranular charge transport pathways. The desirable chemical, electronic, and morphological structures of PDQT bring about high hole mobility of up to 0.97 cm(2)/(V·s) in OTFTs with polymer thin films annealed at a mild temperature of 100 °C and similarly high mobility of 0.89 cm(2)/(V·s) for polymer thin films even without thermal annealing.

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Devices integrated with self-healing ability can benefit from long-term use as well as enhanced reliability, maintenance and durability. This progress report reviews the developments in the field of self-healing polymers/composites and wearable devices thereof. One part of the progress report presents and discusses several aspects of the self-healing materials chemistry (from non-covalent to reversible covalent-based mechanisms), as well as the required main approaches used for functionalizing the composites to enhance their electrical conductivity, magnetic, dielectric, electroactive and/or photoactive properties. The second and complementary part of the progress report links the self-healing materials with partially or fully self-healing device technologies, including wearable sensors, supercapacitors, solar cells and fabrics. Some of the strong and weak points in the development of each self-healing device are clearly highlighted and criticized, respectively. Several ideas regarding further improvement of soft self-healing devices are proposed.

In recent times, fused aromatic DiketoPyrroloPyrrole-(DPP)-based functional semiconductors have attracted considerable attention in the developing field of organic electronics. Over the past few years, DPP-based semiconductors have demonstrated remarkable improvements in the performance of both organic field-effect transistor (OFET) and organic photovoltaic (OPV) devices due to the favourable features of the DPP unit, such as excellent planarity and better electron-withdrawing ability. Driven by this success, DPPbased materials are now being exploited in various other electronic devices including complementary circuits, memory devices, chemical sensors, photodetectors, perovskite solar cells, organic light-emitting diodes, and more. Recent developments in the use of DPP-based materials for a wide range of electronic devices are summarized, focusing on OFET, OPV, and newly developed devices with a discussion of device performance in terms of molecular engineering. Useful guidance for the design of future DPP-based materials and the exploration of more advanced applications is provided.

There is little question that the 'electronic revolution' of the 20 th century has impacted every aspect of humanity. However, the emergence of solid-state electronics as a ubiquitous feature of an advanced modern society is posing new challenges that the management of electronic waste (e-waste) will remain through the 21 st century. In addition to developing strategies to manage such e-waste, further challenges can be identified concerning the conservation and recycling of scarce elements, reducing the W. Li and Q. Liu contributed equally to this work. A. K. K. Kyaw is grateful to Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting (No. 2017KSYS007); Shenzhen Science, Technology and Innovation Commission (No. JCYJ20180305180645221); Guangdong Basic and Applied Basic Research Foundation (No. 2020A1515010916); and High-level University Fund (G02236004). Q. Liu wishes to thank Queensland University of Technology (QUT) for offering a scholarship through the QUT Postgraduate Research Award (QUTPRA) to conduct his research. P. S.wishes to thank QUT for the financial support from the Australian Research Council (ARC) for the Future Fellowship (FT130101337) and QUT core funding (QUT/322150-0301/07).