Concentration-engineered spray-deposited Si/NiO heterojunctions for self-powered UV photodetection
Source abstract
Abstract
Self-powered ultraviolet (UV) photodetectors based on Si/NiO heterojunctions were fabricated using a cost-effective spray pyrolysis technique. The effect of precursor concentration on the structural, morphological, optical, and photodetection properties of p-NiO films deposited on n-Si substrates was systematically investigated. X-ray diffraction and X-ray photoelectron spectroscopy revealed polycrystalline films with coexisting NiO and Ni 2 O 3 phases and mixed Ni 2+ /Ni 3+ oxidation states. Surface morphology and optical reflectance were found to depend strongly on precursor concentration and film thickness. The devices exhibited pronounced rectifying behaviour and enhanced photoresponse under 395 nm illumination. A finite photocurrent at zero bias confirmed self-powered operation driven by the built-in electric field of the heterojunction. The photodetectors demonstrated good sensitivity, repeatability, detectivity, and fast response, highlighting spray-deposited Si/NiO heterojunctions as promising low-cost UV photodetectors. • Si/NiO heterojunction UV photodetectors fabricated via spray pyrolysis • Mixed NiO/Ni 2 O 3 phases confirmed with concentration-dependent microstructure • Finite photocurrent at zero bias demonstrates true self-powered operation • High sensitivity, fast response, and competitive detectivity achieved
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Transition Metal Oxide Nanomaterials · Ga2O3 and related materials · ZnO doping and properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (35)
Show source-provided references
1. Semiconducting metal oxide nanostructures for water splitting and photovoltaics
2. Road map of semiconductor metal-oxide-based sensors: a review10.3390/s23156849 ↗
3. Metal oxides for optoelectronic applications10.1038/nmat4599 ↗
4. Perspective on the future of silicon photonics and electronics10.1063/5.0050117 ↗
5. Transition metal oxides10.1146/annurev.pc.40.100189.001451 ↗
6. Nickel oxide thin films grown by chemical deposition techniques: potential and challenges in next‐generation rigid and flexible device applications10.1002/inf2.12146 ↗
7. Enhanced p-type conductivity and band gap narrowing in heavily Al doped NiO thin films deposited by RF magnetron sputtering10.1088/0953-8984/21/11/115804 ↗
8. Heterostructure Silicon Solar Cells with Enhanced Power Conversion Efficiency Based on Si x/Ni 3+ Self-Doped NiO x Passivating Contact10.1021/acsomega.2c00496 ↗
9. One-step fabrication of 1D p-NiO nanowire/n-Si heterojunction: development of self-powered ultraviolet photodetector10.1016/j.apsusc.2020.145804 ↗
10. A self-powered broadband photodetector based on an n-Si(111)/p-NiO heterojunction with high photosensitivity and enhanced external quantum efficiency10.1039/C7TC04565D ↗
11. NiO gas sensing element prepared on needle-shaped silicon substrate10.1088/1742-6596/1319/1/012014 ↗
12. Electrochemical and photoelectrochemical properties of nickel oxide (NiO) with nanostructured morphology for photoconversion applications
13. Advanced nano-texture, optical bandgap, and urbach energy analysis of NiO/Si heterojunctions10.1038/s41598-023-33713-y ↗
14. Evaluation of sputtered nickel oxide, cobalt oxide and nickel–cobalt oxide on n-type silicon photoanodes for solar-driven O 2 (g) evolution from water10.1039/D0TA03725G ↗
15. Role of sulfur incorporation in p-Type nickel oxide (p-NiO) on n-Type silicon (n-Si) photoelectrodes for water oxidation reactions10.1021/acsaem.9b02507 ↗
16. Improved capacitance of NiO and nanoporous silicon electrodes for micro-supercapacitor application10.1186/s40712-024-00208-1 ↗
17. Modeling of aerosol-assisted chemical vapor co-deposition of NiO and carbon nanotubes
18. Memristive behavior of ZnO/NiO stacked heterostructure10.1016/j.mee.2013.05.018 ↗
19. Design of particles by spray pyrolysis and recent progress in its application10.1007/s11814-010-0402-5 ↗
20. Spectroscopic and electrical analysis of spray deposited copper oxide thin films
21. Characteristics and sensing of sol-gel derived titanium dioxide-based ultraviolet photodetector on flame Retardant-4 board10.1016/j.sna.2021.112654 ↗
22. Nanostructured mesoporous nickel oxide thin films10.1088/0957-4484/18/11/115613 ↗
23. Oxygen partial pressure effects on nickel oxide thin films and NiO/Si diode performance10.1039/D4MA01113A ↗
24. The scherrer formula for X-Ray particle size determination10.1103/PhysRev.56.978 ↗
25. III. Dislocation densities in some annealed and cold-worked metals from measurements on the X-ray debye-scherrer spectrum10.1080/14786435608238074 ↗
26. X-ray line broadening from filed aluminium and wolfram10.1016/0001-6160(53)90006-6 ↗
27. High-performance multicolor metal-semiconductor-metal Si photodetector enhanced by nanostructured NiO thin film10.1016/j.jallcom.2019.05.286 ↗
28. Nanostructured mesoporous nickel oxide thin films10.1088/0957-4484/18/11/115613 ↗
29. Nickel vacancy behavior in the electrical conductance of nonstoichiometric nickel oxide film10.1063/1.4742993 ↗
30. Solution-processible crystalline NiO nanoparticles for high-performance planar perovskite photovoltaic cells
31. Surface and gas sensing properties of nanocrystalline nickel oxide thin films10.1016/j.apsusc.2013.03.085 ↗
32. X-ray broadening and optical properties of NiO nanoparticles prepared via Co-precipitation method by varying temperature10.1007/s40995-017-0368-9 ↗
33. Strong deep-level-emission photoluminescence in NiO nanoparticles10.3390/nano7080231 ↗
34. Low-intensity UV light sensor based on p-NiO/n-Si heterojunction10.1088/2053-1591/ab5dfc ↗
35. Origin of work function engineering of silver oxide for an in–ga–zn–o schottky diode10.1016/j.apsusc.2019.144519 ↗