Engineering the Exciton Dissociation in Quantum‐Confined 2D CsPbBr<sub>3</sub> Nanosheet Films

DOI Web Site Web Site 被引用文献1件
  • Zhi Yang
    Electronic Materials Research Laboratory (EMRL) Key Laboratory of Education Ministry International Center for Dielectric Research (ICDR) Shaanxi Engineering Research Center of Advanced Energy Materials and Devices Xi'an Jiaotong University Xi'an 710049 China
  • Minqiang Wang
    Electronic Materials Research Laboratory (EMRL) Key Laboratory of Education Ministry International Center for Dielectric Research (ICDR) Shaanxi Engineering Research Center of Advanced Energy Materials and Devices Xi'an Jiaotong University Xi'an 710049 China
  • Hengwei Qiu
    Electronic Materials Research Laboratory (EMRL) Key Laboratory of Education Ministry International Center for Dielectric Research (ICDR) Shaanxi Engineering Research Center of Advanced Energy Materials and Devices Xi'an Jiaotong University Xi'an 710049 China
  • Xi Yao
    Electronic Materials Research Laboratory (EMRL) Key Laboratory of Education Ministry International Center for Dielectric Research (ICDR) Shaanxi Engineering Research Center of Advanced Energy Materials and Devices Xi'an Jiaotong University Xi'an 710049 China
  • Xiangzhou Lao
    Department of Physics, and Shenzhen Institute of Research and Innovation (HKU‐SIRI) The University of Hong Kong Pokfulam Road Hong Kong China
  • Shijie Xu
    Department of Physics, and Shenzhen Institute of Research and Innovation (HKU‐SIRI) The University of Hong Kong Pokfulam Road Hong Kong China
  • Zhonghai Lin
    Key Laboratory of Intelligent Information Processing in Universities of Shandong Shandong Business and Technology University Yantai 264005 China
  • Luyi Sun
    Department of Chemical and Biomolecular Engineering and Polymer Program Institute of Materials Science University of Connecticut Storrs CT 06269 USA
  • Jinyou Shao
    State Key Laboratory of Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 China

書誌事項

公開日
2018-01-22
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/adfm.201705908
公開者
Wiley

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説明

<jats:title>Abstract</jats:title><jats:p>Recent years have witnessed a rapid development of all‐inorganic halide perovskite in optoelectronic devices. Ultrathin 2D CsPbBr<jats:sub>3</jats:sub> nanosheets (NSs) with large lateral dimensions have demonstrated exceptional photophysical properties because of their analogous exciton electronic structure to quantum wells. Despite the incredible progress on device performance, the photophysics and carrier transportation parameters of quantum‐confined CsPbBr<jats:sub>3</jats:sub> NSs are lacking, and the fundamental understanding of the exciton dissociation mechanism is far less developed. Here, a ligands rearrangement mechanism is proposed to explain why annealed NS films have an increased charge transfer rate and a decreased exciton binding energy and lifetime, prompting tunneling as a dominant way of exciton dissociation to separate photogenerated excitons between neighboring NSs. This facile but efficient method provides a new insight to manipulate perovskite nanocrystals coupling. Moreover, ultrathin 2D CsPbBr<jats:sub>3</jats:sub> NS film is demonstrated to have a enhanced absorption cross section and high carrier mobility of 77.9 cm<jats:sup>2</jats:sup> V<jats:sup>−1</jats:sup> s<jats:sup>−1</jats:sup>, contributing to its high responsivity of 0.53 A W<jats:sup>−1</jats:sup>. The photodetector has a long‐term stability up to three months, which are responsible for reliable perovskite‐based device performance.</jats:p>

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