Boron‐Doped Diamond as an Efficient Back Contact to Thermally Grown TiO₂ Photoelectrodes

Abstract

In the present work, we investigate the efficiency of TiO2 photoelectrode layers on boron‐doped diamond foil (BDDF) in comparison with a classic conducting glass (fluorine‐doped tin oxide, FTO) back contact. Crystalline thin TiO2 layers were prepared on the substrates by two different methods: (i) deposition of metallic Ti thin films followed by thermal oxidation to form TiO2 (TO‐TiO2), (ii) reactive sputter deposition of TiO2 thin films and crystallization of these layers (SP‐TiO2). The optimized layers show that TO‐TiO2 films on BDDF deliver a significantly higher incident photon to current efficiency (IPCE) compared to directly sputtered SP‐TiO2 layers and these layers on BDDF also outperform FTO as a back contact. We ascribe this beneficial effect of the BDDF back contact to the formation of an intermediate conductive phase of Ti carbides at the TO‐TiO2/BDDF interface.

Flexible Diamond Fibers for High‐Energy‐Density Zinc‐Ion Supercapacitors

“…It is beneficial for charge transport at the substrate interface and therefore the charge transfer resistance between the electrolytes and DFs is reduced. [10] To compare the electrochemical performance of DFs with different grain sizes, three DFs (DF-1, DF-2, and DF-3) were systematically prepared by applying different deposition parameters (Table S1, Supporting Information). The thickness of the as-grown BDD layers was between 200 to 250 nm ( Figure S2, Supporting Information).…”

“…It is beneficial for charge transport at the substrate interface and therefore the charge transfer resistance between the electrolytes and DFs is reduced. [ 10 ]…”

Zr4+-Doped Anatase TiO2 Nanotube Array Electrode for Electrocatalytic Reduction of L-cystine

“…As one of the most studied catalytic materials, TiO 2 has an important role in the field of catalysis [5][6][7][8][9][10][11]. Skúlason et al [12] discussed the role of transition metal oxides in the electrocatalytic reduction of N 2 by using density functional theory (DFT) calculations.…”