Supporting Information. Electrochemical Vapor Deposition (E-CVD) of Semiconductors from Gas. Phase with a Solid Membrane Cell
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1 Supporting Information Electrochemical Vapor Deposition (E-CVD) of Semiconductors from Gas Phase with a Solid Membrane Cell Sung Ki Cho 1, Fu-Ren F. Fan, and Allen J. Bard * Center for Electrochemistry, Department of Chemistry and Biochemistry The University of Texas at Austin, Austin, TX Current address : School of Energy and Integrated Materials Engineering, Department of Energy and Chemical Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi-si, Gyeongsangbuk-do , Republic of Korea * To whom correspondence should be addressed. ajbard@mail.utexas.edu S1
2 Intensity (arb. unit) (a) (012) (202) (210) (111) (020) Two theta (degree) log (conductivity S cm -1 ) (b) Temperature ( o C) Figure S1. (a) Powder X-ray diffraction pattern and (b) the conductivity of synthesized CsHSO 4. The membrane powder was pelletized (1.32 cm 2, 1 mm thick, 0.5 g) by pressing at 340 MPa with a mechanical press (uniaxial). Ag electrodes were fabricated on both sides of pellet by adding Ag paste. The conductivity of membrane pellet was determined by AC impedance spectroscopy (0±5 mv AC voltages, change in the frequency from 1 to 10 5 Hz) at different temperature. S2
3 Cyclic voltammetry on CsHSO 4 membrane without any reactant gas (a) (b) Potential (vs. Pt QRE) Potential (vs. Pt QRE) (c) (d) H 2 on counter electrode (-0.7 V biased) Ar on counter electrode (-1.9 V biased) Potential (vs. Pt QRE) Time (s) Figure S2. CVs on CsHSO 4 membrane with (a) negative potential and (b) positive potential scans (in the absence of H 2 flow) with respect to Pt quasi-reference electrode (three electrodes system); (c) Current response with the potential biased between two electrodes on each side of membrane (two electrodes system); (d) chronoamperometric curves with or without H 2 flow. With all membrane-based electrochemical systems, current flows only by the transport of S3
4 conducting ion which is a proton in the case of CsHSO 4. Therefore, the reactions on both electrodes are considered at the same time, and those reactions should generate and consume protons to maintain a constant proton flow in the membrane during metal electrodeposition. Figure S2 showed cyclic voltammograms (CVs) on both electrodes under Ar gas flow, which means the absence of the reactant gas. As the potential of Pt electrode was swept negatively with reference to the other Pt electrode (three electrodes system), which acted as a Pt quasi-reference electrode, a big reduction curve was evolved and it must be the reduction of proton in CsHSO 4 (Fig. S2a). With the positive scan, two oxidation reactions were observed. First peak was assumed to be contributed from the oxidation of carbon paper presumably due to the presence of trace amount of water in CsHSO 4. The other was the oxidation of bisulfate (HSO ) to S 2 O 8 (Fig. S2b). 2HSO S O + 2H + 2e E = 2.0 V vs. NHE The proton reduction curve rises sharply in the negative potential region in which its slope is governed by the IR drop associated with the membrane resistance (~80 Ω) whereas the oxidation curve is sluggish. Accordingly, when a potential was swept negatively without Pt quasi-reference electrode (two electrodes system), the shape of i-v curve was very similar to that of oxidation reaction curve, indicating the current passing through the membrane was determined by the oxidation reaction (Fig. S2c). However, this oxidation reaction did not supply the proton to membrane, so that eventually the proton inside the membrane will be depleted. Accordingly, the current under Ar flow did not maintain and it decayed with time as shown in Fig. S2d. S4
5 Pt black Au mesh Sintered SS Au mesh Porous Ag Porous Ag SS mesh Ti mesh Sintered Stainless Steel Stainless Steel mesh Ti mesh Potential (V vs. RHE) Figure S3. Cyclic volatmmograms from various metal electrodes on CsHSO 4 membrane by applying negative potentials (in the presence of H 2 flow) with respect to reference electrode which can be regarded as a reversible hydrogen electrode. Small currents of SS and Ti meshes were due to the small surface areas which were associated with mesh size. S5
6 0.020 (a) SiCl 4 Ar GeCl (b) Ar SiCl Potential (V vs. NHE) Bias voltage (V) -0.9 Potential (V vs. RHE) (c) GeCl 4 SiCl Time (s) Figure S4. (a,b) CVs and (c) chronopotentiometry (10 ma) on CsHSO 4 membrane with Ar, SiCl 4, and GeCl 4 flowing in (a, c) three electrode and (b) two electrode systems. (a, c) The small difference with and without metal chloride gas flow shows the competition between proton and metal chloride reduction, and accordingly low current efficiency for the deposition process. We speculat that the increase in the potential of (c) chronopotentiometry arises from surface change and subsequent hydrogen evolution activity. In the case of silicon deposition, the increase is significantly larger and it might be due to the surface passivation of silicon, which is commonly observed in silicon electrodeposition process. (Munisamy, T.; Bard, A. J. Electrochim. Acta 2010, 55, ) S6
7 Si Intensity (arb. unit) SiO 2 10 min. sputtering Before sputtering Binding energy (ev) Figure S5. X-ray photoelectron spectrum of Si 2p of silicon deposit which was deposited on gold mesh (10 ma, 1500 s). S7
8 Intensity (arb. unit) Au (111) Au (200) Au (220) Au (331) Two theta (degree) Figure S6. X-ray diffraction spectrum of germanium deposit on gold mesh. S8
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