Bismuth Sulfide Nanostructures for Optoelectronic Applications

Bismuth sulfide (Bi2S3) nanostructures have emerged as versatile materials for optoelectronic devices owing to their favourable band gap, high absorption coefficient and anisotropic crystal structure. These nanostructures span one-dimensional (nanoribbons, nanowires), two-dimensional (nanosheets) and three-dimensional (hierarchical flowers, mesoporous networks) morphologies, each offering unique pathways for charge transport and light–matter interaction. Synthesis approaches such as solvothermal routes, chemical bath deposition, pulse-plating and sonochemical methods enable precise control over size, crystallinity and surface chemistry. The orthorhombic lattice of Bi2S3 facilitates anisotropic charge mobility, while its band gap, typically in the range 1.2–1.5 eV, aligns well with visible and near-infrared absorption. Surface modifications, including noble-metal decoration and heterojunction formation with polymers or wide-band-gap semiconductors, further enhance photocarrier separation and responsivity. Practical demonstrations encompass photodetectors with high detectivity, hybrid solar cells with long-lived charge separation, photoelectrochemical cells showing efficient hydrogen evolution and UV sensors with rapid response times. The combination of earth-abundant constituents, low-temperature, solution-based manufacturing and tunable optoelectronic properties underpins the global interest in Bi2S3 nanostructures for next-generation, cost-effective photonic and photovoltaic applications.

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Bismuth Sulfide Nanostructures for Optoelectronic Applications publication trend

The graph below shows the total number of articles in bismuth sulfide nanostructures for optoelectronic applications across all publications each year (not limited to Nature Index journals).

Technical terms

Nanostructure: A material with features in the 1–100 nm range conferring quantum and surface-related properties.

Band gap: The energy difference between valence and conduction bands determining optical absorption edge.

Responsivity: Photocurrent generated per unit incident optical power, expressed in AW^−1.

Detectivity: Measure of a photodetector’s sensitivity, often given as Jones (cm Hz^½ W^−1).

Photocarrier: Electron or hole generated by photon absorption and contributing to electrical current.

Heterojunction: Interface between two materials with differing band structures facilitating charge separation.

Quantum confinement: Modification of electronic states when particle dimensions approach exciton Bohr radius.

References

1. A fast sonochemical method to prepare 1D and 3D nanostructures of bismuth sulfide. Journal of the Brazilian Chemical Society (2013).
2. Synthesis of Bi2S3 thin films based on pulse-plating bismuth nanocrystallines and its photoelectrochemical properties. Royal Society Open Science (2020).
3. New Formulation to Synthetize Semiconductor Bi2S3 Thin Films Using Chemical Bath Deposition for Optoelectronic Applications. Symmetry (2022).
4. Improvement in Optoelectronic Properties of Bismuth Sulphide Thin Films by Chromium Incorporation at the Orthorhombic Crystal Lattice for Photovoltaic Applications. Molecules (2022).
5. Improved Optoelectronic Properties of Nanostructured Eu Doped Bi2S3 Thin Films for the Detection of UV Light. Crystals (2022).
6. Nano-Bismuth-Sulfide for Advanced Optoelectronics. Photonics (2022).