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Surface Doping of Organic Single‐Crystal Semiconductors to Produce Strain‐Sensitive Conductive Nanosheets
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- Shun Watanabe
- Material Innovation Research Center (MIRC) and Department of Advanced Materials Science Graduate School of Frontier Sciences The University of Tokyo 5‐1‐5 Kashiwanoha Kashiwa Chiba 277‐8561 Japan
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- Ryohei Hakamatani
- Material Innovation Research Center (MIRC) and Department of Advanced Materials Science Graduate School of Frontier Sciences The University of Tokyo 5‐1‐5 Kashiwanoha Kashiwa Chiba 277‐8561 Japan
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- Keita Yaegashi
- Material Innovation Research Center (MIRC) and Department of Advanced Materials Science Graduate School of Frontier Sciences The University of Tokyo 5‐1‐5 Kashiwanoha Kashiwa Chiba 277‐8561 Japan
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- Yu Yamashita
- Material Innovation Research Center (MIRC) and Department of Advanced Materials Science Graduate School of Frontier Sciences The University of Tokyo 5‐1‐5 Kashiwanoha Kashiwa Chiba 277‐8561 Japan
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- Han Nozawa
- PI‐CRYSTAL Inc. 5‐4‐19 Kashiwanoha Kashiwa Chiba 277‐0882 Japan
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- Mari Sasaki
- Material Innovation Research Center (MIRC) and Department of Advanced Materials Science Graduate School of Frontier Sciences The University of Tokyo 5‐1‐5 Kashiwanoha Kashiwa Chiba 277‐8561 Japan
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- Shohei Kumagai
- Material Innovation Research Center (MIRC) and Department of Advanced Materials Science Graduate School of Frontier Sciences The University of Tokyo 5‐1‐5 Kashiwanoha Kashiwa Chiba 277‐8561 Japan
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- Toshihiro Okamoto
- Material Innovation Research Center (MIRC) and Department of Advanced Materials Science Graduate School of Frontier Sciences The University of Tokyo 5‐1‐5 Kashiwanoha Kashiwa Chiba 277‐8561 Japan
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- Cindy G. Tang
- Department of Physics National University of Singapore Lower Kent Ridge Road Singapore S117550 Singapore
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- Lay‐Lay Chua
- Department of Physics National University of Singapore Lower Kent Ridge Road Singapore S117550 Singapore
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- Peter K. H. Ho
- Department of Physics National University of Singapore Lower Kent Ridge Road Singapore S117550 Singapore
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- Jun Takeya
- Material Innovation Research Center (MIRC) and Department of Advanced Materials Science Graduate School of Frontier Sciences The University of Tokyo 5‐1‐5 Kashiwanoha Kashiwa Chiba 277‐8561 Japan
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Description
<jats:title>Abstract</jats:title><jats:p>A highly periodic electrostatic potential, even though established in van der Waals bonded organic crystals, is essential for the realization of a coherent band electron system. While impurity doping is an effective chemical operation that can precisely tune the energy of an electronic system, it always faces an unavoidable difficulty in molecular crystals because the introduction of a relatively high density of dopants inevitably destroys the highly ordered molecular framework. In striking contrast, a versatile strategy is presented to create coherent 2D electronic carriers at the surface of organic semiconductor crystals with their precise molecular structures preserved perfectly. The formation of an assembly of redox‐active molecular dopants via a simple one‐shot solution process on a molecularly flat crystalline surface allows efficient chemical doping and results in a relatively high carrier density of 10<jats:sup>13</jats:sup> cm<jats:sup>−2</jats:sup> at room temperature. Structural and magnetotransport analyses comprehensively reveal that excellent carrier transport and piezoresistive effects can be obtained that are similar to those in bulk crystals.</jats:p>
Journal
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- Advanced Science
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Advanced Science 8 (3), 2002065-, 2020-12-18
Wiley
