Authors : Mohammedain Adm Alhgabo Belal; Shair Alla Ahmed Hasan; Alobid Ali Khalid Awad Elkareem; Salma Adam Hassan Ali; M.A. Abdalrasool; A.S. Hamed

Volume/Issue : Volume 10 - 2025, Issue 6 - June

Google Scholar : https://tinyurl.com/2s3xar4x

DOI : https://doi.org/10.38124/ijisrt/25jun455

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Abstract : Li2O powders were synthesized by the sol–gel method using lithium nitrate solutions of 1.0 M, 0.9 M, and 0.7 M to analyze the effect of precursor concentration on photovoltaic and optical properties. Reflux heating, filtration, and calcination of the samples were followed by analysis through UV–VIS spectroscopy. Optical properties such as absorption coefficient, extinction coefficient, and band gap were determined, and the band gap increased with increasing concentration from 3.410 eV to 3.573 eV. The powders were pasted and coated onto FTO substrates, sensitized by Blue Nile dye, and packaged with graphite-coated counter electrode and iodine electrolyte. I–V measurements under illumination of 0.55 W·m−2 showed the 1.0 M sample reached maximum efficiency (0.903%), resulting from the stronger absorption and narrower band gap of the sample. Films with lower concentration had decreased photovoltaic performance. These findings show that Li2O content significantly impacts optical properties and solar cell efficiency, offering a direct route to improving Li-based material performance in low-light photovoltaics.

Keywords : Li2O Thin Films, Sol–Gel Synthesis, Optical Properties, Photovoltaic Efficiency, and Precursor Concentration.

References :

1. Martin A Green, Third generation photovoltaics: solar cells for 2020 and beyond, Physica E: Low-dimensional Systems and Nanostructures, Elsevier, Volume 14, Issues 1–2, April 2002, Pages 65-70, https://doi.org/10.1016/S1386-9477(02)00361-2.
2. Jiangkai Yu,Yujia Dou,Ju Zhao,Shengtian Zhu,Kai Zhang,Fei Huang, A review of metal oxide semiconductors: Progress in solution-processed photovoltaic technologies, Journal of Alloys and Compounds, Elsevier, Volume 1024, 20 April 2025, 180207, https://doi.org/10.1016/j.jallcom.2025.180207.
3. I.S. Jacobs and C.P. Bean, “Fine particles, thin films Ingrid Rodríguez-Gutiérrez ,Karen Cristina Bedin ,Beatriz Mouriño ,João Batista Souza Junior, and Flavio Leandro Souza, Advances in Engineered Metal Oxide Thin Films by Low-Cost, Solution-Based Techniques for Green Hydrogen Production, nanomaterials, MDPI, 7 June 2022, https://doi.org/10.3390/nano12121957.
4. Luca Rebecchi,Nicolò Petrini,Ivet Maqueira Albo,Nicola Curreli,Andrea Rubino, Transparent conducting metal oxides nanoparticles for solution-processed thin films optoelectronics, Optical Materials: X, Elsevier, Volume 19, July 2023, 100247,  https://doi.org/10.1016/j.omx.2023.100247.  
5. Ali O.M. Maka and Jamal M. Alabid, Solar energy technology and its roles in sustainable Development, Clean Energy, Oxford, 2022, 6, 476–483, https://doi.org/10.1093/ce/zkac023.
6. Ankit Kumar, Hem Kanwar Rathore, Debasish Sarkar, Ashok Shukla, Nanoarchitectured transition metal oxides and their composites for supercapacitors, Electrochemical Science Advances, Wiley-VCH GmbH, Volume2, Issue6 December 2022 e210018, 7, https://doi.org/10.1002/elsa.202100187,
7. Sobia Aslam,Lijuan Hou,Qi Liu,Wenxiu He,Daobin Mu,Li Li,Renjie Chen,Feng Wu, Lithium rich layered oxide: exploring structural integrity, electrochemical behavior, performance failures and enhancement strategies through doping and coating, Energy Storage Materials, Energy Storage Materials, Volume 79, June 2025,104325,https://doi.org/10.1016/j.ensm.20 5.104325.
8. Hyeong Pil Kim, Abd Rashid bin Mohd Yusoff, Hyo Min Kim, Hee Jae Lee, Gi Jun Seo & Jin Jang, Inverted organic photovoltaic device with a new electron transport layer, Nanoscale Research Letters, Springer Nature, Volume 9, article number 150, 2014, https://doi.org/10.1186/1556-276X-9-150.
9. Shahzad MK, Mujtaba ST, Hussain S, Farooq MU, Laghari RA, Khan SA, Tahir MB, Rehman JU, Khalil A, Ali MM. Lithium-based perovskites materials for photovoltaic solar cell and protective rays window applications: a first-principle calculations. Discov Nano. 2023 Feb 16;18(1):15.https://doi.org/10.1186/s11671-023-03790-z.
10. Martín Esteves,Luciana Fernández-Werner,Fernando Pignanelli,Benjamín Montenegro, Marcelo Belluzzi, Mariela Pistón,Mauricio Rodríguez Chialanza,Ricardo Faccio,Álvaro W. Mombrú , Synthesis , characterization and simulation of lithium titanate nanotubes for dye sensitized solar cells, Ceramics International, Elsevier, Volume 45, Issue 1, January 2019, Pages 708 -717, https://doi.org/10.1016/j.ceramint.2018.09.233.
11. Nicky P. Patel,Kamlesh V. Chauhan, Structural, optical and electrical study of ZnO:Al thin films: A review, Materials Today: Proceedings, Elsevier, 23 April,2022,https://doi.org/10.1016/j.matpr.2022.04.268
12. Gadelrab, O., Elmahgary, M.G., Mahran, A.M. et al. Optical properties of lithium titanate as a potential layer in light harvesters. J Mater Sci: Mater Electron 33, 12053– 12061  ,2022 ,  https://doi.org/10.1007/s10854-022-08165-1.
13. Adam Mohammed Adam Bakheet, Emtithal Ahmed Jadallah, Al desogi Omer Hamed, Abdalsakhi. S. Mohammed, and Mona. A. Abdalrasool, Optical and Electrical Conductivity of Fe3O4 and Ni2O3 Thin Films through Optical Method, Vol. 7 Issue 1, January - 2023, Pages: 6-10, ISSN: 2643-9603.
14. Yousef A. Alsabah, Abdelrahman A. Elbadawi, Rania M. Abaker, Abdelsakhi Suliman & Hassan H. Abuelhassan, International Journal of Engineering and Applied Physics (IJEAP), Vol. 2, No. 3, September 2022, pp. 580~586, ISSN: 2737-8071.