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  1. Thermally Stable MAPbI3 Perovskite Solar Cells with Efficiency of 19.19% and Area over 1 cm2 achieved by Additive Engineering

    Yongzhen Wu, Fengxian Xie, Han Chen, Xudong Yang, Huimin Su, Molang Cai, Zhongmin Zhou, Takeshi Noda and Liyuan Han

    Version of Record online: 19 MAY 2017 | DOI: 10.1002/adma.201701073

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    By enhancing the crystalline quality of the simple and widely used MAPbI3 perovskite through additive engineering, unprecedented photovoltaic performance and thermal stability are achieved. A certified efficiency of 19.19% is obtained for devices with active area over 1 cm2, and the high-performing devices show unprecedented durability, maintaining >80% of the initial efficiency after 500 h of thermal aging at 85 °C.

  2. Towards Efficient Spectral Converters through Materials Design for Luminescent Solar Devices

    Barry McKenna and Rachel C. Evans

    Version of Record online: 19 MAY 2017 | DOI: 10.1002/adma.201606491

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    Sspectral converters can be applied to finished solar cells to overcome intrinsic non-absorption and thermalization losses and improve the device efficiency. Recent progress in the development of new materials for spectral conversion through luminescent downshifting, luminescent solar concentration, and upconversion is reviewed, with emphasis placed on their integration with emerging technologies, including perovskite, organic, and dye-sensitized solar cells.

  3. Tuning of the Optical, Electronic, and Magnetic Properties of Boron Nitride Nanosheets with Oxygen Doping and Functionalization

    Qunhong Weng, Dmitry G. Kvashnin, Xi Wang, Ovidiu Cretu, Yijun Yang, Min Zhou, Chao Zhang, Dai-Ming Tang, Pavel B. Sorokin, Yoshio Bando and Dmitri Golberg

    Version of Record online: 19 MAY 2017 | DOI: 10.1002/adma.201700695

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    Intense oxygen doping and functionalization of hexagonal boron nitride (h-BN) nanosheets narrow the bandgap of the material from ≈5.5 to 2.1 eV in experiments, and lead to the appearance of paramagnetism and photoluminescence properties, which are not seen in h-BN. These findings pave a new way for the engineering of the optical, electronic, and magnetic properties of BN nanosheets.

  4. Bioinspired Composite Microfibers for Skin Adhesion and Signal Amplification of Wearable Sensors

    Dirk-M. Drotlef, Morteza Amjadi, Muhammad Yunusa and Metin Sitti

    Version of Record online: 19 MAY 2017 | DOI: 10.1002/adma.201701353

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    Strong adhesion of wearable sensors to dry and wet skin is proposed by a novel approach. Micropatterned adhesive films are composed of microfibers decorated with mushroom-shaped vinylsiloxane tips. Crosslinking the viscous tips directly on the skin significantly enhances the adhesion performance due to their great shape adaptation, which in turn highly increases the output signal quality of wearable strain sensors.

  5. Biphasic Supramolecular Self-Assembly of Ferric Ions and Tannic Acid across Interfaces for Nanofilm Formation

    Beom Jin Kim, Sol Han, Kyung-Bok Lee and Insung S. Choi

    Version of Record online: 19 MAY 2017 | DOI: 10.1002/adma.201700784

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    The biphasic interfacial supramolecular self-assembly of ferric ions (FeIII) and tannic acid in a heterogeneous system provides a powerful method for the formation of uniform and stable nanofilms in one step. The versatility of the synthetic strategy is demonstrated under various experimental settings (water–oil, hydrogel–water, and cell–water biphasic systems).