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Plasma-Doped Si Nanosheets for Transistor and <i>p-n</i> Junction Application
Lee, Jaejun,Kwon, Juyoung,Seo, Dongjea,Na, Jukwan,Park, Sangwon,Lee, Hyo-Jung,Lee, Seung-Woo,Lee, Ki-Young,Park, Tae-Eon,Choi, Heon-Jin American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.45
<P>Since the discovery of graphene, layered transition metal dichalcogenides (TMDs) have been considered promising materials for applications in various fields because of their fascinating structural features and physical properties. Doping in semiconducting TMDs is essential for their practical application. In this regard, two-dimensional (2D) Si materials have emerged as a key component of 2D electronic, optics, sensing, and spintronic devices because of their complementary metal-oxide-semiconductor (CMOS) compatibility, high-quality oxide formation, moderated bandgap, and well-established doping techniques. Here, we report the tuning of the electronic properties of Si nanosheets (NSs) using a plasma-doping technique. Using this doping process, we fabricated <I>p</I>-<I>n</I> homojunction diodes and transistors with Si NSs. The estimated high ON/OFF ratio of ∼10<SUP>6</SUP> and field-effect hole mobility of 329 cm<SUP>2</SUP> V<SUP>-1</SUP> s<SUP>-1</SUP> suggest a high crystal quality of the Si NSs. We also demonstrate vertically stacked heterostructured <I>p</I>-<I>n</I> junction diodes with MoS<SUB>2</SUB>, which exhibit rectifying properties and excellent light response.</P> [FIG OMISSION]</BR>
Lee, Songyi,Lee, Kyung Mi,Lee, Minji,Yoon, Juyoung American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.11
<P>A new polydiacetylene oxyphenylboronic acid (<B>PDA-OPBA-1</B>) bearing group was synthesized and showed diverse colorimetric changes, such as yellow, orange, and red, upon the addition of cationic surfactants at pH 7.4. On the other hand, anionic surfactants and simple ammonium salts did not show any color change. Specifically, color changes to yellow for cetyl trimethylammonium chloride (CTAC), red for dodecyl trimethylammonium bromide (DTAB), orange for benzylcetyldimethylammonium chloride (BCDA), and dark orange for hexadecylpyridium bromide (HDPB) are observed, respectively. Different head groups and alkyl chain lengths of cationic surfactants can be intelligently distinguished via a unique penetration process.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-11/am3030245/production/images/medium/am-2012-030245_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am3030245'>ACS Electronic Supporting Info</A></P>