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説明:

Ruddlesden-Popper perovskites are natural two-dimensional (2D) semicon- ductors composed of nanometer-thin inorganic layers separated by organic bar- riers. Combining the optical quality of inorganic quantum-wells with the flexibility of organic crystals, they emerged as promising platforms for nanotechnology across the fields of photovoltaics, optoelectronics, and photonics. However, it has remained exceptionally difficult to electrically control their optical response, which is dominated by neutral excitons, due to persistent challenges to introduce doping. Here, we demonstrate bipolar, continuous tuning of light emission and absorption in 2D perovskites by elec- trically injecting carriers to densities as high as 10^12 cm−2. Our approach is based on interfacing ultrathin sheets of perovskites with few-layer graphene and hexagonal boron nitride into gate-tunable heterostructures. We reveal the emergence of both negatively- and positively-charged excitons, or trions, with binding energies up to 46 meV, arguably the highest ones measured for 2D systems. Trions are shown to dominate light emission and propagate with mobilities reaching 200cm2/(Vs) at elevated temperatures. Our findings introduce the physics of interacting mixtures of optical and electrical excitations to the broad family of inorganic-organic nanostructures. The presented strategy to electrically control the optical response of 2D perovskites opens up promising avenues towards electrically-modulated light-emitters, externally guided charged exciton currents, and exciton transistors based on layered, hybrid semiconductors.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: 2D hybrid perovskites, light emission, electrical doping

刊行年月日: 2023-03-21

出版者: Wiley

掲載誌:

• Advanced Materials (ISSN: 15214095) vol. 35 issue. 18 2210221

研究助成金:

• Deutsche Forschungsgemeinschaft 287022282
• Deutsche Forschungsgemeinschaft 424709454
• Japan Society for the Promotion of Science London 19H05790
• Japan Society for the Promotion of Science London 20H00354
• Japan Society for the Promotion of Science London 21H05233
• U.S. Air Force FA9550‐19‐1‐0405
• Simons Foundation

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/adma.202210221

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更新時刻: 2025-03-01 08:30:50 +0900

MDRでの公開時刻: 2025-03-01 08:30:50 +0900