Preparation of Nano-Oxides for Photovoltaic Applications by Drop-Casting
DOI:
https://doi.org/10.31149/ijimm.v4i3.2733Keywords:
Photovoltaics, Nanooxide, DropcastingAbstract
The growing demand for sustainable energy has accelerated the development of low-cost photovoltaic technologies based on solution-processed nano-oxide materials. This study explores the fabrication of zinc oxide (ZnO), nickel oxide (NiO), and doped metal-oxide thin films using a simple drop-casting technique for solar cell applications. The films were synthesized via low-temperature chemical methods and deposited as functional layers within photovoltaic architectures, with thickness and morphology controlled through precursor concentration and annealing optimization. Structural, optical, and electrical properties were characterized using XRD, SEM, UV–Vis spectroscopy, and current–voltage (J–V) measurements under simulated solar illumination. The results show that controlled annealing and suitable doping improve crystallinity, reduce defect density, and enhance charge transport. Doped NiO layers provide better band alignment and reduced interfacial recombination, while ZnO nanoparticle films demonstrate effective electron transport and improved interfacial contact, leading to enhanced power conversion efficiency and device stability. These findings confirm that drop-casting is a cost-effective, scalable approach for producing high-quality nano-oxide thin films for next-generation photovoltaic applications.
References
[1] J. Pérez and A. Ávila, Coatings and Thin-Film Technologies. IntechOpen, 2019. doi: 10.5772/intechopen.74351.
[2] I. D. Rummaja, N. A. H. Senin, M. I. Idris, Z. B. Zamani, R. H. Ramlee, and L. Bradley, “Analysis of effect of annealing at high temperature on nickel oxide and zinc oxide thin film for solar cell applications,” Indonesian Journal of Electrical Engineering and Computer Science, vol. 34, no. 2, p. 777, Mar. 2024, doi: 10.11591/ijeecs.v34.i2.pp777-787.
[3] S. A. M. A. Noor and A. M. J. Al-Shamari, “Preparation and Performance of ZnO and ZnO/MnO 2 Nanostructures as Anode Electrodes in DSSCs,” Indonesian Journal of Chemistry, vol. 23, no. 6, p. 1618, Dec. 2023, doi: 10.22146/ijc.84037.
[4] A. Ghaffar, I. A. Channa, and A. D. Chandio, “Mitigating UV-Induced Degradation in Solar Panels through ZnO Nanocomposite Coatings,” Sustainability, vol. 16, no. 15, p. 6538, Jul. 2024, doi: 10.3390/su16156538.
[5] R. Dash, C. Mahender, P. K. Sahoo, and A. Soam, “Preparation of ZnO layer for solar cell application,” Materials Today Proceedings, vol. 41, p. 161, Sep. 2020, doi: 10.1016/j.matpr.2020.08.448.
[6] M. I. U. Weerasinghe et al., “Dye-sensitized solar cells achieved with multi-layered SnO2/ZnO composite photoanodes through precise control of thickness and composition,” Journal of Materials Science Materials in Electronics, vol. 35, no. 33, Nov. 2024, doi: 10.1007/s10854-024-13837-1.
[7] A. Roy, S. Bhandari, and T. Sen, “Room-Temperature Processable TiO2 Solar Paint for Dye-Sensitized Solar Cells,” Sustainability, vol. 15, no. 24, p. 16610, Dec. 2023, doi: 10.3390/su152416610.
[8] D. K. Kumar et al., “Functionalized metal oxide nanoparticles for efficient dye-sensitized solar cells (DSSCs): A review,” Materials Science for Energy Technologies, vol. 3. Elsevier BV, p. 472, Jan. 01, 2020. doi: 10.1016/j.mset.2020.03.003.
[9] M. Abrari, M. Ahmadi, M. Ghanaatshoar, H. R. Moazami, and S. S. H. Davarani, “Fabrication of dye-sensitized solar cells based on SnO2/ZnO composite nanostructures: A new facile method using dual anodic dissolution,” Journal of Alloys and Compounds, vol. 784, p. 1036, Jan. 2019, doi: 10.1016/j.jallcom.2018.12.299.
[10] M. A. S. A. Aziz, M. Harun, and N. Ahmad, “Tio2 as the Economically Semi Conducting Layer for Dye-Sensitized Solar Cell (DSSC) Application,” International Journal of Academic Research in Economics and Management Sciences, vol. 13, no. 3, Jul. 2024, doi: 10.6007/ijarems/v13-i3/22041.
[11] A. Wibowo et al., “ZnO nanostructured materials for emerging solar cell applications,” RSC Advances, vol. 10, no. 70. Royal Society of Chemistry, p. 42838, Jan. 01, 2020. doi: 10.1039/d0ra07689a.
[12] “Biomedical Applications of ZnO Nanoparticles: A Paradigm Shift in Healthcare,” Letters in Applied NanoBioScience, vol. 13, no. 3, p. 132, Sep. 2024, doi: 10.33263/lianbs133.132.
[13] M. K. A. Mohammed and M. Shekargoftar, “Surface treatment of ZnO films with carbon nanotubes for efficient and stable perovskite solar cells,” Sustainable Energy & Fuels, vol. 5, no. 2, p. 540, Dec. 2020, doi: 10.1039/d0se01493a.
[14] H. E. Sánchez‐Godoy, K. Salim, R. A. Rodríguez-Rojas, I. Zarazúa, and S. Masi, “In Situ Ethanolamine ZnO Nanoparticle Passivation for Perovskite Interface Stability and Highly Efficient Solar Cells,” Nanomaterials, vol. 12, no. 5, p. 823, Feb. 2022, doi: 10.3390/nano12050823.
[15] M. K. A. Mohammed et al., “Improvement of the interfacial contact between zinc oxide and a mixed cation perovskite using carbon nanotubes for ambient-air-processed perovskite solar cells,” New Journal of Chemistry, vol. 44, no. 45, p. 19802, Jan. 2020, doi: 10.1039/d0nj04656f.
[16] P. Fan, J.-H. Tian, K. Wang, D. Zheng, J. Yu, and T. P. Russell, “Efficient and stable perovskite solar cells based on insulating polymer modified ZnO nanoparticles,” Journal of Materials Chemistry C, vol. 12, no. 47, p. 19219, Jan. 2024, doi: 10.1039/d4tc03821e.
[17] B. Yang, J. Cang, Z. Li, and J. Chen, “Nanocrystals as performance-boosting materials for solar cells,” Nanoscale Advances, vol. 6, no. 5, p. 1331, Jan. 2024, doi: 10.1039/d3na01063e.
[18] R. Alkarsifi et al., “Organic-Inorganic doped Nickel Oxide Nanocrystals for Hole Transport Layers in Inverted Polymer Solar Cells with Color Tuning,” HAL (Le Centre pour la Communication Scientifique Directe), Jan. 2021, Accessed: Sep. 2025. [Online]. Available: https://hal.science/hal-02979018
[19] N. Shibayama et al., “All-inorganic inverse perovskite solar cells using zinc oxide nanocolloids on spin coated perovskite layer,” Nano Convergence, vol. 4, no. 1, Jul. 2017, doi: 10.1186/s40580-017-0113-2.
[20] M. Nur‐E‐Alam et al., “Spin-coated mg-doped ZnO thin films as electron transport layers for efficient and stable perovskite solar cells,” Scientific Reports, vol. 15, no. 1, Oct. 2025, doi: 10.1038/s41598-025-20503-x.
[21] X. Liang et al., “Colloidal metal oxide nanocrystals as charge transporting layers for solution-processed light-emitting diodes and solar cells,” Chemical Society Reviews, vol. 46, no. 6. Royal Society of Chemistry, p. 1730, Jan. 01, 2017. doi: 10.1039/c6cs00122j.
[22] A. Intaniwet et al., “Utilization of Zinc-doped Nickel Oxide Hole Transporting Materials to Improve Efficiency and Stability of Perovskite Solar Cells,” Suan Sunandha Science and Technology Journal, vol. 9, no. 2, p. 71, Nov. 2022, doi: 10.53848/ssstj.v9i2.236.
[23] H. M. Hamzah et al., “Structural and optoelectronic properties of NiOx thin films synthesized via co-precipitation for hole transport layer applications,” Scientific Reports, vol. 15, no. 1, Oct. 2025, doi: 10.1038/s41598-025-18509-6.
[24] N. N. Định, T. S. T. Khanh, L. M. Long, D. C. Nguyen, and N. P. H. Nam, “Nanomaterials for Organic Optoelectronic Devices: Organic Light-Emitting Diodes, Organics Solar Cells and Organic Gas Sensors,” MATERIALS TRANSACTIONS, vol. 61, no. 8, p. 1422, Jul. 2020, doi: 10.2320/matertrans.mt-mn2019042.
[25] S. Chakrabarti, D. Carolan, B. Alessi, P. Maguire, V. Švrček, and D. Mariotti, “Microplasma-synthesized ultra-small NiO nanocrystals, a ubiquitous hole transport material,” Nanoscale Advances, vol. 1, no. 12, p. 4915, Jan. 2019, doi: 10.1039/c9na00299e.
[26] S. Huang et al., “Enhancing the performance of polymer solar cells using solution-processed copper doped nickel oxide nanoparticles as hole transport layer,” Journal of Colloid and Interface Science, vol. 535, p. 308, Oct. 2018, doi: 10.1016/j.jcis.2018.10.013.
[27] E. F. Sawires et al., “Exploring various Integration Methods of carbon quantum dots in CsPbCl3 perovskite solar cells for enhanced power conversion efficiency,” Journal of Materials Science Materials in Electronics, vol. 35, no. 11, Apr. 2024, doi: 10.1007/s10854-024-12464-0.
[28] F. P. G. Choi, “Chemical synthesis of nonstoichiometric NiOx nanoparticles using different nickel salts and application as an additive or interface layer in photovoltaic devices,” TURKISH JOURNAL OF PHYSICS, vol. 45, no. 1, p. 13, Jan. 2021, doi: 10.3906/fiz-2011-6.
[29] O. Daoudi et al., “Unravelling the role of nickel doping on the physical properties of CuO thin films deposited by Spray Pyrolysis and theoretical analysis of nanostructured ZnO/Ni:CuO-based heterojunction solar cells,” Research Square (Research Square), Nov. 2022, doi: 10.21203/rs.3.rs-2277801/v1.
[30] Z. Ahmad, A. M. Afzal, M. F. Khan, A. Manzoor, H. M. W. Khalil, and S. Aftab, “Copper-Doped Nickle-Oxide Nanoparticles for Photocatalytic Degradation of Erichrome Black-T and Methylene Blue and Its Solar Cell Applications,” Journal of Nanoelectronics and Optoelectronics, vol. 14, no. 9, p. 1304, Jul. 2019, doi: 10.1166/jno.2019.2551.
[31] M. A. Islam et al., “High Mobility Reactive Sputtered CuxO Thin Film for Highly Efficient and Stable Perovskite Solar Cells,” Crystals, vol. 11, no. 4, p. 389, Apr. 2021, doi: 10.3390/cryst11040389.
[32] C. M. Subramaniyam et al., “Synthesis and characterization studies of pure and Ni doped CuO nanoparticles by hydrothermal method,” Journal of King Saud University - Science, vol. 34, no. 3, p. 101831, Jan. 2022, doi: 10.1016/j.jksus.2022.101831.
[33] R. Goel, R. Jha, and C. R. Kant, “Investigating the structural, electrochemical, and optical properties of p-type spherical nickel oxide (NiO) nanoparticles,” Journal of Physics and Chemistry of Solids, vol. 144, p. 109488, Apr. 2020, doi: 10.1016/j.jpcs.2020.109488.
[34] R. Hossain, R. K. Nekouei, A. A. Mahmood, and V. Sahajwalla, “Value-added fabrication of NiO-doped CuO nanoflakes from waste flexible printed circuit board for advanced photocatalytic application,” Scientific Reports, vol. 12, no. 1, p. 12171, Jul. 2022, doi: 10.1038/s41598-022-16614-4.
[35] S. Sajid et al., “Computational Study of Ternary Devices: Stable, Low-Cost, and Efficient Planar Perovskite Solar Cells,” Nano-Micro Letters, vol. 10, no. 3, May 2018, doi: 10.1007/s40820-018-0205-5.
[36] H. Arbouz, “Exploring the Potential of Vacancy-Ordered Cs2PtI6 Perovskite as a Lead-Free Absorber for Next-Generation Solar Cells via Modeling and Simulation,” International Journal of Computational and Experimental Science and Engineering, vol. 11, no. 4, Oct. 2025, doi: 10.22399/ijcesen.3281.
[37] Md. A. Islam et al., “Green synthesis of nickel oxide hole transport layer via aloe vera extract-assisted sol-gel process,” Journal of Sol-Gel Science and Technology, vol. 109, no. 2, p. 580, Jan. 2024, doi: 10.1007/s10971-023-06296-3.
[38] S. H. B. V. Kumar et al., “Hollow Cathode Gas Flow Sputtering of Nickel Oxide Thin Films for Hole‐Transport Layer Application in Perovskite Solar Cells,” Advanced Energy and Sustainability Research, vol. 5, no. 4, Dec. 2023, doi: 10.1002/aesr.202300201.
[39] P. Mahajan et al., “Review of current progress in hole-transporting materials for perovskite solar cells,” Journal of Energy Chemistry, vol. 68, p. 330, Dec. 2021, doi: 10.1016/j.jechem.2021.12.003.
[40] S. Muniandy, M. I. B. Idris, Z. A. F. B. M. Napiah, N. S. T. Kie, Z. Baharudin, and M. Rashid, “Influence of pH-Driven Synthesis on the Performance of NiO as a Hole Transport Layer in Perovskite Solar Cells,” Engineering Journal, vol. 29, no. 4, p. 23, Apr. 2025, doi: 10.4186/ej.2025.29.4.23.
[41] D. D. Girolamo, F. D. Giacomo, F. Matteocci, A. G. Marrani, D. Dini, and A. Abate, “Progress, highlights and perspectives on NiO in perovskite photovoltaics,” Chemical Science, vol. 11, no. 30. Royal Society of Chemistry, p. 7746, Jan. 01, 2020. doi: 10.1039/d0sc02859b.
[42] H. Lee, Y.-T. Huang, M. W. Horn, and S. Feng, “Engineered optical and electrical performance of rf–sputtered undoped nickel oxide thin films for inverted perovskite solar cells,” Scientific Reports, vol. 8, no. 1, Mar. 2018, doi: 10.1038/s41598-018-23907-0.
[43] D. Koushik et al., “Plasma-assisted atomic layer deposition of nickel oxide as hole transport layer for hybrid perovskite solar cells,” Journal of Materials Chemistry C, vol. 7, no. 40, p. 12532, Jan. 2019, doi: 10.1039/c9tc04282b.
[44] Y.-W. Wu, C. Chang, F.-B. Chiu, and S. Yang, “Efficient and stable perovskite solar cells using manganese-doped nickel oxide as the hole transport layer,” RSC Advances, vol. 12, no. 35, p. 22984, Jan. 2022, doi: 10.1039/d2ra03411e.
[45] J. Cheng et al., “Pre- and post-treatments free nanocomposite based hole transport layer for high performance organic solar cells with considerably enhanced reproducibility,” Nano Energy, vol. 34, p. 76, Feb. 2017, doi: 10.1016/j.nanoen.2017.02.021.
[46] P. Wang, C. Zhang, L. Hu, S. Li, W. Ren, and Y. Hao, “Research progress of inverted planar perovskite solar cells based on nickel oxide as hole transport layer,” Acta Physica Sinica, vol. 70, no. 11, p. 118801, Jan. 2021, doi: 10.7498/aps.70.20201896.
[47] R. Alkarsifi et al., “Organic–inorganic doped nickel oxide nanocrystals for hole transport layers in inverted polymer solar cells with color tuning,” Materials Chemistry Frontiers, vol. 5, no. 1, p. 418, Nov. 2020, doi: 10.1039/d0qm00619j.
[48] Y. Li et al., “High Fill Factor and Reduced Hysteresis Perovskite Solar Cells Using Small-Molecule-Engineered Nickel Oxide as the Hole Transport Layer,” ACS Applied Energy Materials, vol. 6, no. 3, p. 1555, Jan. 2023, doi: 10.1021/acsaem.2c03434.
