Optoelectronic Properties of Ternary Nitride Semiconductors

Ternary nitride semiconductors, composed of two metal cations and nitrogen anions, present a versatile platform for optoelectronic devices. Their strong metal–nitrogen bonding yields robust crystal structures—commonly derived from wurtzite or orthorhombic lattices—exhibiting direct bandgaps in the visible to near-infrared range. Alloying and cation-ordering strategies enable bandgap tuning from under 1 eV to above 3 eV, while high absorption coefficients and adjustable carrier effective masses support efficient light absorption and emission. Computational screening has predicted dozens of earth-abundant compositions with favourable stability, prompting high-pressure and thin-film synthesis to realise novel compounds. Control over cation disorder and metastable polymorphs has emerged as a key tool to engineer band edges, photoluminescence, carrier mobility and defect tolerance. These materials have applications in photovoltaics, light-emitting diodes, photoelectrochemical fuel generation and optical sensors, combining earth-abundance, environmental benignity and scalable synthesis routes to address global energy and display technologies.

Research from Nature Portfolio

Recent studies have combined high-throughput computation and high-pressure synthesis to chart the ternary zinc nitride composition space, identifying earth-abundant semiconductors with direct bandgaps and low carrier effective masses. One foundational work screened candidate systems, predicted structures and electronic properties, and validated a low-pressure-synthesised compound showing tunable red photoluminescence and bandgap control through cation substitution. In parallel, detailed optical absorption measurements of a prototype pseudo-III–V nitride were used to extract its conduction-band effective mass and intrinsic bandgap by combining Drude-model analysis of infrared absorption with Burstein–Moss shift analysis. This work established a conduction-band effective mass of approximately 0.37 m₀ and an intrinsic bandgap near 0.94 eV, providing critical parameters for device modelling and demonstrating the importance of cation-sublattice disorder on optoelectronic performance.

Optoelectronic Properties of Ternary Nitride Semiconductors publication trend

The graph below shows the total number of articles in optoelectronic properties of ternary nitride semiconductors across all publications each year (not limited to Nature Index journals).

Technical terms

Ternary nitride semiconductor: A crystalline material composed of two distinct metal cations combined with nitrogen, often exhibiting strong covalent bonding and direct bandgaps.

Bandgap: The energy difference between a material’s valence band and conduction band that determines the wavelength of light absorbed or emitted.

Direct bandgap: A bandgap in which electron–hole recombination can occur without a change in momentum, yielding efficient radiative emission.

Carrier effective mass: The apparent inertia of an electron or hole in a periodic lattice, influencing mobility and conductivity.

Cation disorder: Variations in the ideal arrangement of metal cations within the crystal lattice that can tune electronic structure and optical properties.

References

1. Low-temperature synthesis of cation-ordered bulk Zn 3 WN 4 semiconductor via heterovalent solid-state metathesis. Chemical Science (2024).
2. Discovery of earth-abundant nitride semiconductors by computational screening and high-pressure synthesis. Nature Communications (2016).
3. Conduction-band effective mass and bandgap of ZnSnN2 earth-abundant solar absorber. Scientific Reports (2017).
4. Combinatorial Synthesis of Magnesium Tin Nitride Semiconductors. Journal of the American Chemical Society (2020).
5. Zinc Titanium Nitride Semiconductor toward Durable Photoelectrochemical Applications. Journal of the American Chemical Society (2022).