Negative differential resistance of TEMPO molecules on Si(1 1 1)


Hallbäck, Ann-Sofie and Poelsema, Bene and Zandvliet, Harold J.W. (2007) Negative differential resistance of TEMPO molecules on Si(1 1 1). Applied Surface Science, 253 (8). pp. 4066-4071. ISSN 0169-4332

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Abstract:Negative differential resistance (NDR) has been observed for individual 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) molecules on Si(1 1 1) in ultra high vacuum (UHV) scanning tunneling microscopy (STM) and spectroscopy (STS) measurements at room temperature. NDR effects were observed exclusively at negative bias voltage using an n-type Si(1 1 1) sample. At 77 K no NDR effects were observed, but the I(V) curves were similar in shape to those recorded on bare Si(1 1 1) sites. TEMPO was observed to adsorb preferentially at corner adatom sites of the Si(1 1 1)-7 × 7 structure. Although the Si(1 1 1)-7 × 7 reconstruction was conserved, local defects were frequently observed in the vicinity of the TEMPO adsorbates.
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Copyright:© 2006 Elsevier B.V.
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