The article reports the solution-phase synthesis of porphyrin-fused graphene nanoribbons (PGNRs), which are nanometre-wide strips of graphene with metalloporphyrins integrated into their conjugated backbone. This approach allows for precise control over the position of metal atoms and heteroaromatic units, enabling tuning of the optical, electronic, and magnetic properties of the materials. The PGNRs exhibit a narrow optical bandgap (~1.0 eV) and high local charge mobility (>400 cm² V⁻¹ s⁻¹) as measured by terahertz spectroscopy. The authors fabricated ambipolar field-effect transistors and single-electron transistors using these PGNRs, demonstrating their potential for electronic applications. The synthesis involves Yamamoto polymerization of a dichloroporphyrin monomer followed by cyclo-dehydrogenation, resulting in polymer chains with a high average degree of polymerization (N = 34) and a weight-average length of 85 nm. The PGNRs show promising charge transport properties, with high mobilities and ambipolar behavior, making them suitable for use in electronic devices.The article reports the solution-phase synthesis of porphyrin-fused graphene nanoribbons (PGNRs), which are nanometre-wide strips of graphene with metalloporphyrins integrated into their conjugated backbone. This approach allows for precise control over the position of metal atoms and heteroaromatic units, enabling tuning of the optical, electronic, and magnetic properties of the materials. The PGNRs exhibit a narrow optical bandgap (~1.0 eV) and high local charge mobility (>400 cm² V⁻¹ s⁻¹) as measured by terahertz spectroscopy. The authors fabricated ambipolar field-effect transistors and single-electron transistors using these PGNRs, demonstrating their potential for electronic applications. The synthesis involves Yamamoto polymerization of a dichloroporphyrin monomer followed by cyclo-dehydrogenation, resulting in polymer chains with a high average degree of polymerization (N = 34) and a weight-average length of 85 nm. The PGNRs show promising charge transport properties, with high mobilities and ambipolar behavior, making them suitable for use in electronic devices.