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Comprehensive Summary: Diketopyrrolopyrrole (DPP) is one of the most promising building blocks for constructing polymer semiconductors with high charge‐carrier mobilities in organic field‐effect transistors (OFETs). In this study, a novel DPP‐based conjugated polymer, PDPPy‐BDD, was designed and synthesized. The ambipolar field‐effect transistor characteristics were realized with the average hole and electron mobilities of 3.5 × 10–3 and 3.07 × 10–2 cm2 V−1 s−1, respectively. Both the hole and electron mobilities could be successfully enhanced by using a tetramethylammonium iodide (NMe4I) additive. Such an enhancement was attributed to the formation of stronger interchain π–π stackings, the weakening of the face‐on packing orientation in the thin film state, and the higher channel conductivities in the OFETs. [ABSTRACT FROM AUTHOR]

Currently, photoelectrochemical water‐splitting research is dominated by inorganic and organic–inorganic hybrid photoelectrodes. Although organic semiconductors have several advantages over their inorganic counterparts, the development of photoelectrodes based on pure organic materials has been lagging for the last decade. Recent improvements in molecular design, synthesis, and processing of organic semiconductors, such as polythiophenes, graphitic carbon nitrides, conjugated acetylenic polymers, alternating donor–acceptor‐conjugated polymers, and N‐containing fused‐ring small molecules, significantly enhance the performance of these photolectrodes without added cocatalysts. Although this research has been conducted over the past few years, this overlooked topic still stays unexplored, with more efficient materials yet to be discovered. Herein, the early development and recent advances of exclusively organic photoelectrodes for water splitting are summarized and brief perspectives for future improvements are provided. [ABSTRACT FROM AUTHOR]

Comprehensive Summary: Diketopyrrolopyrrole (DPP) is one of the most promising building blocks for constructing polymer semiconductors with high charge‐carrier mobilities in organic field‐effect transistors (OFETs). In this study, a novel DPP‐based conjugated polymer, PDPPy‐BDD, was designed and synthesized. The ambipolar field‐effect transistor characteristics were realized with the average hole and electron mobilities of 3.5 × 10–3 and 3.07 × 10–2 cm2 V−1 s−1, respectively. Both the hole and electron mobilities could be successfully enhanced by using a tetramethylammonium iodide (NMe4I) additive. Such an enhancement was attributed to the formation of stronger interchain π–π stackings, the weakening of the face‐on packing orientation in the thin film state, and the higher channel conductivities in the OFETs. [ABSTRACT FROM AUTHOR]