Advanced Materials

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Recently Published Articles

  1. Identifying and Eliminating Emissive Sub-bandgap States in Thin Films of PbS Nanocrystals

    Gyu Weon Hwang, Donghun Kim, Jose M. Cordero, Mark W. B. Wilson, Chia-Hao M. Chuang, Jeffrey C. Grossman and Moungi G. Bawendi

    Article first published online: 1 JUL 2015 | DOI: 10.1002/adma.201501156

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    Chemical oxidation of under-charged Pb atoms reduces the density of trap states by a factor of 40 in films of colloidal PbS quantum dots for devices. These emissive sub-bandgap states are a byproduct of several standard ligand-exchange procedures. X-ray photoelectron spectro­scopy measurements and density function theory simulations demonstrate that they are associated with under-charged Pb.

  2. Interfacing Solution-Grown C60 and (3-Pyrrolinium)(CdCl3) Single Crystals for High-Mobility Transistor-Based Memory Devices

    Jiake Wu, Congcheng Fan, Guobiao Xue, Tao Ye, Shuang Liu, Ruoqian Lin, Hongzheng Chen, Huolin L. Xin, Ren-Gen Xiong and Hanying Li

    Article first published online: 1 JUL 2015 | DOI: 10.1002/adma.201501577

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    Aligned ferroelectric single crystals of (3-pyrrolinium)(CdCl3) can be prepared, from solution, on top of aligned semiconducting C60 single crystals, using an orthogonal solvent. Memory devices based on these ferroelectric/semiconductor bilayered heterojunctions exhibit much larger hysteresis compared with that of only C60 single crystals. More importantly, the introduction of the ferroelectric layer induces the memory window without dramatically reducing the charge mobility.

  3. Conjugation-Induced Rigidity in Twisting Molecules: Filling the Gap Between Aggregation-Caused Quenching and Aggregation-Induced Emission

    Gan Chen, Wenbo Li, Tianru Zhou, Qian Peng, Di Zhai, Hongxiang Li, Wang Zhang Yuan, Yongming Zhang and Ben Zhong Tang

    Article first published online: 1 JUL 2015 | DOI: 10.1002/adma.201501981

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    Conjugation-induced rigidity in twisting molecules provides a new facile but effective avenue towards solution and solid dual-state efficient luminogens. While conjugation rigidifies the molecular conformations in solution, twisting structure prevents or alleviates detrimental close molecular packing in the solid states, thus synergistically yielding high efficiencies in both solution and solid states.

  4. Mechanically Tough Large-Area Hierarchical Porous Graphene Films for High-Performance Flexible Supercapacitor Applications

    Zhiyuan Xiong, Cailian Liao, Weihua Han and Xiaogong Wang

    Article first published online: 1 JUL 2015 | DOI: 10.1002/adma.201501983

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    Mechanically tough large-area hierarchical porous graphene films are fabricated by blade-casting of graphene oxide hydrogel and postcasting reduction. The as-prepared graphene films, which consist of well-exfoliated graphene nanosheets, possess interpenetrating 3D hierarchical porous structures, high strength and modulus, large specific area, and high electrical conductivity. Flexible film supercapacitors fabricated with the graphene electrodes show superior areal capacitance, good rate performance, and excellent mechanical stability.

  5. An Ultrahigh-Resolution Digital Image Sensor with Pixel Size of 50 nm by Vertical Nanorod Arrays

    Chengming Jiang and Jinhui Song

    Article first published online: 1 JUL 2015 | DOI: 10.1002/adma.201502079

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    The pixel size limit of existing digital image sensors is successfully overcome by using vertically aligned semiconducting nanorods as the 3D photosensing pixels. On this basis, an unprecedentedly high-resolution digital image sensor with a pixel size of 50 nm and a resolution of 90 nm is fabricated. The ultrahigh-resolution digital image sensor can heavily impact the field of visual information.