Simple approach for the fabrication of PEDOT-coated Si nanowires

Abstract

SummaryThe synthesis of a conformal poly(3,4-ethylenedioxythiophene) (PEDOT) layer on Si nanowires was demonstrated using a pulsed electrodeposition technique. N-type Si nanowire (SiNWs) arrays were synthesized using an electroless metal-assisted chemical etching technique. The dependence of the SiNW reflection on the concentration of the AgNO3 solution was identified. A reflection of less than 2% over the entire visible spectral range was obtained for these structures, evidencing their excellent antireflective properties. The etched SiNWs nanostructures can be further modified by using a tapering technique, which further preserves the strong light trapping effect. P-type PEDOT was grown on these SiNWs using electrochemical methods. Since the polymerization reaction is a very fast process with regards to monomer diffusion along the SiNW, the conformal deposition by classical, fixed potential deposition was not favored. Instead, the core–shell heterojunction structure was finally achieved by a pulsed deposition method. An extremely large shunt resistance was exhibited and determined to be related to the diffusion conditions occurring during polymerization.

Ionomer Thin‐Films by Electrochemical Synthesis: Bipolar and Ampholytic Membranes

“…[27] We have recently introduced electropolymerisation as a powerful technique for the preparation of thin-film polymer electrolyte separators. [32][33][34][35][36] Electrochemical deposition is an appropriate technique for the synthesis of polymers from precursors with vinyl or allyl groups, [37][38][39][40] including polystyrene, [41,42] polyacrylonitrile, [43,44] poly(methylmethacrylate), [45] and various electron-conducting polymers, [46] including polythiophene derivatives (PEDOT), [47] polyaniline or polypyrrole. [48] Electrodeposition has many important advantages.…”

Effect of Gold Nanoparticles on the Physical Properties of Poly (3,4-ethylenendioxythiophene): Poly(styrene sulphonate) and its Gas Sensor Application

“…EDAX analyses, as seen in Figure2, proved that the nanoparticles are Au. In addition, the presence of sulphur or sulphur oxide is surely ascribed to PEDOT-PSS [13]. The peaks of Cu and C are originated from the used TEM grid.…”

Anodic Electropolymerization of Sulfonated Poly(phenyl ether): Study of Precursor Isomers and Polymer Growth

“…Conformal deposition, i.e. following the morphology of the substrate and with uniform thickness along the interface, can be achieved by only a few bottom‐up techniques, including chemical vapour deposition; a very powerful technique for the bottom‐up nanostructuration is electrochemical deposition on electronic conducting substrates, where the nanostructure can be varied in a defined way by carefully controlling the electrochemical parameters. The electrodeposition of polymers has been recently extended to various electronic and ionic conducting systems .…”

“…The electrodeposition of polymers has been recently extended to various electronic and ionic conducting systems . In this case, the average chain length can be proportional to the growth time . However there are only few investigations considering the growth kinetics explicitly, because many electrochemical investigations are performed under potentiodynamic conditions, where the growth cannot be easily analyzed theoretically.…”