Look beyond the surface: recent progress in applications of surface-segregated monolayers for organic electronics

Semiconductor/dielectric interface in organic field-effect transistors: charge transport, interfacial effects, and perspectives with 2D molecular crystals

“…When the electric field applied from the gate electrode modulates the channel conductivity, the gate dielectric always has a decisive influence on the charge transport behaviours [17][18][19]. Therefore, understanding of the nature of charge carriers at the semiconductor/dielectric interface is of great importance for clarifying the structureproperty relationships and achieving high-performance OFET devices, which have been the cornerstones for the sustainable advancement in organic electronics [20][21][22][23]. For the characterizations of the interface, numerous optical and electrical technologies are introduced, such as synchrotron-based high-resolution ultraviolet photoelectron spectroscopy and scanning Kelvin probe microscope measurements [24][25][26].…”

Evaluation-oriented exploration of photo energy conversion systems: from fundamental optoelectronics and material screening to the combination with data science

“…A mixture of a donor and an acceptor is similar to the BHJ framework of OPVs, while soluble fullerenes ( [6,6]phenyl-C 61 -butyric acid methyl ester: PCBM and [6,6]phenyl-C 71 -butyric acid methyl ester: PC 71 BM) are commonly used as n-type semiconductors. The author next investigated the correlation of TRMC signals with OPV device performance.…”

“…π-Electrons that mostly occupy the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of aromatic compounds are of particular interest because they exhibit intriguing responses to external stimuli such as photons, electric fields, and magnetic fields [ 1 – 3 ]. Electronic excitation by a photon with an energy greater than the HOMO–LUMO gap (bandgap, E g ) generates an exciton (a pair of holes and electrons coupled with phonons), the energy of which can be converted to electricity when the exciton is dissociated into free charge carriers (hole and electron) that are separately transported to the respective electrodes [ 4 – 6 ]. However, the exciton binding energy of a π-conjugated material is much larger than the thermal energy at room temperature due to the small dielectric constant, whereas an inorganic semiconductor undergoes prompt charge separation owing to its large dielectric constant and small effective mass of charges [ 7 , 8 ].…”

Review of porphyrin-based photodynamic therapy materials

“…As the second strategy, our group have pioneered systematic research focusing on the synthesis, self-assembly, and biomedical applications of stimuli-responsive porphyrin-based telechelics, [107,108] dendrimers, [109,110] block copolymers, [111][112][113] and supramolecular polymers [114,115]. However, compared with the possible leakage release of physical encapsulated porphyrin molecules, these could be functionalized as the motifs of polymers by stimuli-responsive covalent bonds in porphyrin-based polymers.…”