Electronic and electrocatalytic applications based on solution‐processed two‐dimensional platinum diselenide with thickness‐dependent electronic properties

Abstract

Platinum diselenide (PtSe2) has shown great potential as a candidate two‐dimensional (2D) material for broadband photodetectors and electrocatalysts because of its unique properties compared to conventional 2D transition metal dichalcogenides. Synthesis of 2D PtSe2 with controlled layer number is critical for engineering the electronic behavior to be semiconducting or semimetallic for targeted applications. Electrochemical exfoliation has been investigated as a promising approach for mass‐producing in a cost‐effective manner, but obtaining high‐quality films with control over electronic properties remains difficult. Here, we demonstrate wafer‐scale 2D PtSe2 films with pre‐determined electronic types based on a facile solution‐based strategy. Semiconducting or semimetallic PtSe2 nanosheets with large lateral sizes are produced via electrochemically driven molecular intercalation, followed by centrifugation‐based thickness sorting. Finally, gate‐tunable broadband visible and near‐infrared photodetector arrays are realized based on semiconducting PtSe2 nanosheet films, while semimetallic films are used to create catalytic electrodes for overall water splitting with long‐term stability.

Two-dimensional materials as catalysts, interfaces, and electrodes for an efficient hydrogen evolution reaction

“…, thickness) in their atomically thin limit due to quantum confinement effects. 47,48 As shown in Fig. 1d, a list of TMDCs possessing diverse energy bandgap properties can be placed at the interface between a catalytic layer and an electrode with a vertically-stacked catalytic electrode configuration to boost up charge transfer.…”

“…4f illustrates the overall process of maximizing vacancies by sequentially introducing metal electrodeposition following plasma etching. 48 In the cases where a structure is challenging to etch vertically, vacancies can be formed through a solution process. An unstable and highly oxidizing solution, such as H 2 O 2 , can be employed for this purpose (Fig.…”

Chalcogen Vacancy Engineering of Two-Dimensional Transition Metal Dichalcogenides for Electronic Applications

“…In contrast, thinner PtSe 2 nanosheets with a small bandgap facilitate the detection of a wide range of light, including NIR wavelengths (Figure 6f). 52 Another approach for detecting NIR wavelengths based on TMDCs is hierarchical nanostructuring. Hierarchical nanoscale wrinkles, including first to third generations, are generated based on the solution-processed MoS 2 film with their corresponding wrinkle amplitudes (A G1 −A G3 ) and wavelengths (λ G1 ∼ λ G3 ) (Figure 6g).…”

“…Various techniques have been reported for the synthesis of atomically thin TMDCs. These techniques include chemical vapor deposition (CVD) ,− as a bottom-up approach, whereas micromechanical exfoliation ,− and solution-based processing ,,− have been used as top-down approaches (Figure a–c). Recent studies have focused on satisfying both the scalability and the material quality requirements for use in electronics.…”

“…(f) Schematic of the PtSe 2 -based photodetector. Reproduced with permission from ref . Copyright 2023 John Wiley and Sons.…”