Highly Efficient Van Der Waals Heterojunction on Graphdiyne toward the High‐Performance Photodetector

Abstract

Graphdiyne (GDY), a new 2D material, has recently proven excellent performance in photodetector applications due to its direct bandgap and high mobility. Different from the zero‐gap of graphene, these preeminent properties made GDY emerge as a rising star for solving the bottleneck of graphene‐based inefficient heterojunction. Herein, a highly effective graphdiyne/molybdenum (GDY/MoS2) type‐II heterojunction in a charge separation is reported toward a high‐performance photodetector. Characterized by robust electron repulsion of alkyne‐rich skeleton, the GDY based junction facilitates the effective electron–hole pairs separation and transfer. This results in significant suppression of Auger recombination up to six times at the GDY/MoS2 interface compared with the pristine materials owing to an ultrafast hot hole transfer from MoS2 to GDY. GDY/MoS2 device demonstrates notable photovoltaic behavior with a short‐circuit current of −1.3 × 10−5 A and a large open‐circuit voltage of 0.23 V under visible irradiation. As a positive‐charge‐attracting magnet, under illumination, alkyne‐rich framework induces positive photogating effect on the neighboring MoS2, further enhancing photocurrent. Consequently, the device exhibits broadband detection (453–1064 nm) with a maximum responsivity of 78.5 A W−1 and a high speed of 50 µs. Results open up a new promising strategy using GDY toward effective junction for future optoelectronic applications.

Rational Fabrication of Fe3O4/Co3O4/Graphdiyne Tandem Heterojunction toward Optimized Photocatalytic Hydrogen Evolution

“…According to the IUPAC classification, it is a typical IV isotherm and H3 lag ring, demonstrating the coexistence of large and medium pores in all samples. [38] The BJH pore size distribution of the sample is shown in the illustration section, which also indicates that the pores of the sample are in the mesoporous region 28,16,36,33,148, and 76 m 2 g À1 , the pore sizes (D p ) were 19, 11, 21, 20, 9, and 11 nm, and the total pore volumes (V p ) were 0.13, 0.04, 0.18, 0.16, 0.33, and 0.21 cm 3 g À1 , respectively. The S BET of the prepared Fe 3 O 4 material is relatively small, which may be related to its heavy core and gel structure.…”

“…For example, Lee et al reported a graphdiyne/molybdenum (GDY/MoS 2 ) type-II heterojunction that is highly efficient in charge separation and exhibits remarkable photovoltaic behavior. [16] It showed a short-circuit current of À1.3 Â 10 À5 A, an open-circuit voltage of 0.23 V, a maximum responsivity of 78.5 AW À1 maximum responsivity, and a speed of 50 μs under visible light irradiation, opening up a new strategy for the use of GDY to achieve efficient connectivity for future photovoltaic applications. Li et al anchored atomically dispersed copper and erbium atoms to all crystallized graphdiyne (CuEr-GDY) and used water as the reduction medium to efficiently convert CO 2 to CO at the gas-solid interface.…”

Cascade growth and performance optimization of a laminated heterointerface based on graphdiyne

“…The morphology of the samples were observed via scanning electron microscopy (SEM) (FESEM, Gemini 300 Zeiss), transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) (JEOL-1011 microscope). 1 H NMR and 13 C NMR spectra were recorded using a Bruker Advance DMX 400 MHz instrument in CDCl 3 with tetramethylsilane as the internal standard. The chemical structure of the products was characterized by Fourier transform infrared spectroscopy (FT-IR, Tensor II), UV-vis spectroscopy (Hitachi U-3900H) and Raman spectroscopy (PHS-3C, 473 laser device).…”

“…Recently, graphdiyne (GDY) has emerged as a new twodimensional carbon allotrope, attracting significant attention and interest. [1][2][3][4][5] Currently, GDY-based materials are used as key components in a variety of practical devices, such as energy storage devices, [6][7][8][9][10] field effect transistors, 11,12 photodetectors, [13][14][15][16][17] photovoltaic devices, [18][19][20][21] and magnetic devices. 22,23 The excellent performance and bright perspective of GDY in the above-mentioned devices originate from its special intrinsic structure and related characteristic properties.…”

Promoting CO2 electroreduction to CO by a graphdiyne-stabilized Au nanoparticle catalyst

“…10 Each acetylene unit in GDY is connected to the benzene ring, forming a planar porous structure that facilitates electrolyte diffusion, mass transfer and gas release. 11–13 In addition, due to its highly π-conjugated structure, large surface area, evenly distributed pores, good chemical stability, and excellent electron conductivity, GDY has shown great prospects in the fields of batteries, 14–18 optoelectronic devices 19–23 and electrocatalysis. 24–31 More importantly, due to its unique physical and chemical properties, there is a strong d–π electron interaction between the GDY substrate and metal catalysts.…”