Electronics, photonics and device physics articles within Nature Materials

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  • Article |

    Combining resonant inelastic X-ray scattering and photoluminescence spectroscopy, an elementary excitation in hexagonal-boron-nitride-based single-photon emitters has been demonstrated, giving rise to multiple regular harmonics that can explain the wide frequency range of these emitters.

    • Jonathan Pelliciari
    • , Enrique Mejia
    •  & Gabriele Grosso

  • Research Briefing |

    Hybrid organic–inorganic perovskite materials have promise as the photovoltaic technology of the future. A method for spectroscopic optical control reveals how the structural dynamics and vibrations of a perovskite’s organic cations affect the electronic performance of working photovoltaic devices.

  • Comment |

    An essential part of developing organic mixed ionic–electronic conducting materials and organic electrochemical transistors is consistent and standardized reporting of the product of charge carrier mobility and volumetric capacitance, the μC* product. This Comment argues that unexpected changes in transistor channel resistance can overestimate this figure of merit, leading to a confusion of comparisons in the literature.

    • Maryam Shahi
    • , Vianna N. Le
    •  & Alexandra F. Paterson

  • News & Views |

    Quantum dots couple to form artificial molecules that allow for variable colour emission in response to an electric field.

    • James Cassidy
    • , Justin Ondry
    •  & Dmitri V. Talapin

  • Article |

    The transmission spectrum reflects energy alignment between electrodes and frontier orbitals in single-molecule junctions but few experimental tools exist for characterization beyond the HOMO–LUMO gap. Here, the authors develop a single-molecule photoelectron tunnelling spectroscopy approach that makes it possible to map the transmission spectrum beyond the HOMO–LUMO gap at room temperature.

    • Haojie Liu
    • , Lijue Chen
    •  & Wenjing Hong

  • News & Views |

    Passivation of traps via site-specific surface doping allows access to the intrinsic properties of organic semiconductors and leads to the observation of electron atmospheres in organic crystals.

    • Oana D. Jurchescu

  • News & Views |

    Bright hot plasmon emission is observed in graphene due to the ultrafast relaxation of hot carriers that were excited by femtosecond laser pulses of visible light.

    • Frank H. L. Koppens
    •  & Klaas-Jan Tielrooij

  • Perspective |

    Semimetal photodetectors provide high-speed and broadband operation but suffer from serious drawbacks such as high dark currents. This Perspective discusses the opportunities offered by topological effects to overcome these issues and improve their performance.

    • Jing Liu
    • , Fengnian Xia
    •  & Dong Sun

  • Letter |

    Anisotropic honeycomb crystal of black phosphorous is found to have pseudospin polarization greater than 95% at room temperature, attributed to the merging of Dirac cones. This bipolar pseudospin semiconductor may be useful for pseudospintronics.

    • Sung Won Jung
    • , Sae Hee Ryu
    •  & Keun Su Kim

  • Letter |

    Water clusters induce hole traps in organic semiconductor thin films. Detrimental effects of hole and electron traps on charge transport can be avoided by using materials with ionization energy and electron affinity within an energy window of 2.4 eV.

    • Naresh B. Kotadiya
    • , Anirban Mondal
    •  & Gert-Jan A. H. Wetzelaer

  • Perspective |

    Electrolyte gating of complex oxides enables substantial control of electronic phase transitions, allowing electrical control of complex phenomena. Here, the role of both electrostatic and electrochemical mechanisms in this process is elucidated.

    • Chris Leighton

  • Article |

    Films of exfoliated crystals of two-dimensional hybrid metal halide perovskites with phenyl groups as organic cations show increased molecular rigidity, reduced electron–phonon interactions and blue emission with photoluminescence quantum yield approaching 80%.

    • Xiwen Gong
    • , Oleksandr Voznyy
    •  & Edward H. Sargent

  • News & Views |

    Voltage control of recently discovered two-dimensional magnets has been demonstrated, highlighting their potential for low-power data storage.

    • Ajit Srivastava

  • Commentary |

    Mobility is an important charge-transport parameter in organic, inorganic and hybrid semiconductors. We outline some of the common pitfalls of mobility extraction from field-effect transistor (FET) measurements and propose practical recommendations to avoid reporting erroneous mobilities in publications.

    • Hyun Ho Choi
    • , Kilwon Cho
    •  & Vitaly Podzorov

  • Letter |

    A device is presented that can detect mid-infrared plasmons in graphene encapsulated by hexagonal boron nitride via the thermoelectric effect; the natural decay product of the plasmons (electronic heat) is converted into a measurable voltage signal.

    • Mark B. Lundeberg
    • , Yuanda Gao
    •  & Frank H. L. Koppens

  • News & Views |

    Ultra-low-power electronic switching of stable exciton–polariton spin states has now been achieved in a semiconductor microcavity. This opens a new route to the integration of spin-based photonics and electronics.

    • T. C. H. Liew

  • Article |

    The photocurrent generated in organic photodetectors and solar cells can be enhanced by increasing light absorption in the active layer. It is now shown that an extended persistence length can increase the oscillator strength of conjugated polymers.

    • Michelle S. Vezie
    • , Sheridan Few
    •  & Jenny Nelson

  • News & Views |

    The observation of magnetic skyrmions at room temperature that can be driven by short current pulses at speeds exceeding 100 m s−1 raises great expectations for skyrmion-based racetrack memories.

    • Stefan Krause
    •  & Roland Wiesendanger

  • Article |

    By diluting conjugated polymers in high-bandgap host matrices it is shown that electron trapping effects can be significantly reduced. This approach is used to fabricate polymer LEDs with enhanced efficiency and reduced fabrication costs.

    • D. Abbaszadeh
    • , A. Kunz
    •  & P. W. M. Blom

  • Article |

    The conductance of single-molecule junctions based on oligoacenes is shown to saturate when the molecule length increases. The saturation trend depends on the frontier orbitals of the metals used and on their hybridization with molecular π-orbitals.

    • T. Yelin
    • , R. Korytár
    •  & O. Tal

  • Article |

    Electronic many-body effects are used to control the electron effective mass, and thus the plasma energy and electrical conductivity, of thin films of the correlated metals SrVO3 and CaVO3, making them good candidates as transparent conductors.

    • Lei Zhang
    • , Yuanjun Zhou
    •  & Roman Engel-Herbert

  • News & Views |

    Superconducting qubits are used to demonstrate features of quantum fault tolerance, making an important step towards the realization of a practical quantum machine.

    • Simon Benjamin
    •  & Julian Kelly

  • Article |

    Magnetic memory devices are typically based on ferromagnetic materials. Now, a memory resistor based on the antiferromagnetic alloy FeRh is demonstrated at room temperature.

    • X. Marti
    • , I. Fina
    •  & R. Ramesh

  • News & Views |

    A series of breakthroughs is making the fabrication of single-atom devices possible. Their behaviour is controlled by the quantum state of single dopants, and they hold promise for applications such as quantum bits, magnetometers and memories.

    • Joaquin Fernández Rossier

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