Perovskite Quantum Dots Supplier - Alfa Chemistry

Single Layer Quantum Dots

Single Layer Quantum Dots

Product Description

Alfa Chemistry offers a variety of single layer quantum dots, including single layer WS2 quantum dots, single layer WSe2 quantum dots, and single layer MoS2 quantum dots, which are used in sensing and detection, optoelectronic devices, pharmaceutical applications, lubrication additives, and hydrogen precipitation catalysts.


Uniform particle size

Broad absorption spectrum

Symmetrical emission spectrum

High and stable fluorescence intensity


Dye-sensitized Solar Cells

Tungsten disulfide (WS2) quantum dots, coated on titanium dioxide (TiO2) by chemical bath deposition, have improved the photovoltaic performance of dye-sensitized solar cells (DSSCs) by about 11%. WS2 quantum dots exhibit dominant optical absorption in the spectral range of 350-800 nm with characteristic peaks at 550 nm and 620 nm, corresponding to direct bandgap optical K-dot conversion. The optoelectronic properties of DSSCs with WS2 quantum dots demonstrate the additional photoelectrons generated by WS2 through increased photocurrent density and overall performance.

WS<sub>2</sub> quantum dots in normal and UV-light exposure.Fig.1 WS2 quantum dots in normal and UV-light exposure. (Powar et al., 2020)


The work of Sajid et al. demonstrates the fabrication and characterization of a highly sensitive fully printed photodetector based on a monolayer of active films. The active region consists of a complex of MEH:PPV and MoS2 quantum dots. The device was fabricated using reverse offset electrodes and hybrid surface acoustic wave electrohydrodynamic atomization (SAW-EHDA) for thin film deposition. The structure also has the advantage of a single active layer without a top electrode, making it easier and simpler to fabricate, while improving device robustness and stability. The molybdenum disulfide quantum dots improve the device's sensitivity to the ultraviolet (UV) region, making the device an excellent candidate for commercial UV index sensors in wearable devices.

Step by step device fabrication process including substrate cleaning, electrode printing, and active layer deposition.Fig.2 Step by step device fabrication process including substrate cleaning, electrode printing, and active layer deposition. (Sajid et al., 2018)

Fiber Lasers

WSe2 is a transition metal dichalcogenide (TMDs) material with high performance electronic and optoelectronic properties that is becoming the next generation of optoelectronic devices. By applying WSe2 nanofilms as saturable absorbers in an erbium-doped fiber laser, Dz et al. can experimentally observe versatile mode-locking operation in conventional soliton, soliton molecule, and dual-wavelength mode-locked states. The phase difference and pulse separation of the soliton molecules can be adjusted by appropriately setting the state and pump power of the polarization controller. In the TMDs-based fiber laser, a soliton molecule with four stable phase differences (0, ±π/2, π) was achieved. Also, a novel dual-wavelength mode-locked state with soliton singlet and soliton molecules was obtained.

Schematic set up of vector soliton fiber laser with WSe2 SA.Fig. 3 Schematic set up of vector soliton fiber laser with WSe2 SA. (Dz et al., 2022)

Alfa Chemistry can provide a variety of complex and customized fluorescent quantum dot products. Our products involve perovskites precursors, perovskites quantum dots, quantum dot kit, single layer quantum dots, upconverting nanoparticles and other fluorescent quantum dots. Alfa Chemistry provides products with high fluorescence quantum yield, stable quality and relatively low price. Our products are constantly updated. If the product you need is not in our catalog, please feel free to contact us, we provide relevant custom services.


  1. Powar, N. S. , et al. Chemical bath deposited WS2 quantum dots on TiO2 for dye sensitized solar cell applications[J]. Optical and Quantum Electronics, 2020, 52(2):-.
  2. Sajid, M. , et al. Single Layer Printed Photodetector Based on MEH:PPV-MoS2 Quantum Dots Composite[C]// 2018 9th International Conference on Mechanical and Aerospace Engineering (ICMAE). 2018.
  3. Dz, A , et al. A diverse set of soliton molecules generation in a passively mode-locked Er-doped fiber laser with a saturable absorber of WSe 2 nanofilm[J]. Results in Optics, 2022, 7.
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