Dr. Ryan Chiechi Profile

Dr. Ryan Chiechi

at North Carolina State Univ

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Proceedings Article | 3 October 2022 Presentation

Self-assembled ensembles of protein complexes enable long-range interfacial tunneling

Ryan Chiechi, Xinkai Qiu

Proceedings Volume PC12199, PC121990I (2022) https://doi.org/10.1117/12.2632389

KEYWORDS: Proteins, Interfaces, Semiconductors, Process control, Electron transport, Thin films, Resistance, Perovskite, Logic, Gold

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In this contribution, I will discuss our recent work on charge-transport through self-assembled ensembles of the trimeric protein complex, photosystem I (PSI). These remarkable complexes form robust junctions that can be printed and wired into integrated circuits. Current is mediated by long-range tunneling across the complexes, the orientation of which determines their function; in the "up" or "down" position they exhibit temperature-independent current-rectification. Mixing these orientations leads to no rectification. Thus, by controlling the self-assembly process, all-protein logic circuits can be printed onto flexible substrates with yields approaching 100%. These logic circuits operate at speeds of at least 3 kHz.

Proceedings Article | 11 September 2013 Paper

Quantum interference in EGaIn based tunneling junctions

Davide Fracasso, Ryan Chiechi

Proceedings Volume 8811, 88110U (2013) https://doi.org/10.1117/12.2026174

KEYWORDS: Molecules, Self-assembled monolayers, Electrodes, Gold, Liquids, Interfaces, Molecular electronics, Metals, Molecular interactions, Gallium

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In this report we discuss the great potential of Eutectic Gallium Indium (EGaIn) as conformal soft top electrode. EGaIn is a liquid eutectic supporting a skin (∼ 1 nm-thick) of self-limiting oxide Ga₂O₃ as a non-damaging, conformal top-contact. In the last half of decade EGaIn has been used by several group to form molecular junctions and study charge transport properties in self-assembled monolayer (SAMs). We compared the current density (J) versus applied bias (V) for three different self-assembled monolayers (SAMs) of ethynylthiophenol- functionalized anthracene derivatives with approximately the same thickness and diverse conjugation: linear- conjugation (AC), cross-conjugation (AQ), and broken-conjugation (AH) by using liquid eutectic Ga-In (EGaIn). This skin imparts non-Newtonian rheological properties that distinguish EGaIn from other top-contacts, however it may also have limited the maximum values of J observed for AC. We measure values of J for AH and AQ which are not significantly different (J ≈ 10^-1 A/cm² at V = 0.4 V). For AC, however, J is one (using log-averages) or two (using Gaussian mean) orders of magnitude higher than both AH and AQ. Our results are also in good qualitative agreement with gDFTB calculations on single AC, AQ, and AH molecules transport calculation, based on chemisorbed between Au contacts which predict currents, I, that are two orders of magnitude higher for AC than AH at 0 < |V| < 0.4 V. We ascribe these observations to quantum-interference effects. The agreement between the theoretical predictions on single-molecules and the measurements on SAMs suggest that molecule-molecule interactions do not play a significant role in the transport properties of AC, AQ, and AH.

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