GÜNEŞ PİLİ UYGULAMALARI İÇİN CdS İNCE FİLMLERİN OPTİK ÖZELLİKLERİNİN MALTOZ KATKISIYLA GELİŞTİRİLMESİ

Öz

Kimyasal banyo depolama (CBD) yöntemi kullanılarak nano yapılı kadmiyum sülfit (CdS) ince filmler cam yüzeyler üzerinde üretilmiştir. Farklı konsantrasyonlardaki maltoz (C₁₂H₂₂O₁₁,α-D-Glukopiranozil-(1→4)-α-D-Glukopiranoz), büyüme çözeltilerinde bir katkı maddesi olarak kullanılmıştır. Maltozun CdS ince filmlerin yapısal, morfolojik ve optik özellikleri üzerindeki etkisi X-Işını kırınımı (XRD), taramalı elektron mikroskobu (SEM) ve UV-Vis spektrofotometre kullanılarak incelenmiştir. Analizler, filmlerin kristal büyüklüklerinin maltoz konsantrasyonunun artmasıyla azaldığını ve filmlerin homojenliğinin maltoz konsantrasyonunun aratmasıyla arttığını göstermiştir. Ayrıca, hem optik yasak enerji bant aralığı hem de optik geçirgenlik değerleri maltoz konsantrasyonunun artmasıyla artmıştır. Bu sonuçlar büyüme çözeltisi içindeki maltoz konsantrasyonunun artmasının nano yapılı CdS filmlerin yüzey morfolojilerini, kristal yapılarını, yasak enerji bant aralığını ve optik geçirgenlik değerlerini dikkat çekici bir şekilde etkilediğini göstermiştir.

Anahtar Kelimeler

• CdS,maltoz,optik özellikler,kimyasal banyo depolama

Improvement of Optical Properties of CdS Thin Films by Maltose Additive for Solar Cell Applications

Öz

Nanostructured cadmium sulfide (CdS) thin films were fabricated on glass substrates by using chemical bath deposition (CBD) method. Different concentrations of maltose (C₁₂H₂₂O₁₁,α-D-Glukopiranozil-(1→4)-α-D-Glukopiranoz) were used as an additive in the growth solutions. The influence of maltose on structural, morphological and optical properties of CdS films has been investigated by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and ultraviolet-visible (UV-Vis.) analysis. The analysis showed that the values of crystallite size of the films decreases with increasing maltose concentration in the bath and the uniformity of the films increases with increasing maltose concentrations. Also, both the optical band gap value and transmission rate increases with increasing maltose concentration. These results show that increasing maltose concentration in the growth solution remarkably affects the surface morphology, crystal structure, band gap and transmittance of the nanostructured CdS films.

Anahtar Kelimeler

• CdS,maltose,optical properties,chemical bath deposition

Kaynakça

1. Alamgir, Khan, W., Ahmad, S., Hassan, M.M., Naqvi, A.H. (2014) Structural phase analysis, band gap tuning and fluorescence properties of Co doped TiO2 nanoparticles, Optical Materials, 38, 278-285. doi: 10.1016/j.optmat.2014.10.054
2. Attia, M.S., Zoulghena, H., and. Abdel-Mottaleb, M.S.A. (2014) A new nano-optical sensor thin film cadmium sulfide doped in sol–gel matrix for assessment of α-amylase activity in human saliva, Analyst, 139, 793-800. doi:10.1039/c3an01645e
3. Butt, S., Shah, N.A., Nazir, A., Ali, Z., Maqsood, A. (2014) Influence of film thickness and In-doping on physical properties of CdS thin films, Journal of Alloys and Compounds, 587, 582-587. doi: 10.1016/j.jallcom.2013.10.221
4. Han, J., Spanheimer, C., Haindl, G., Fu, G., Krishnakumar, V., Schaffner, J., Fan, C., Zhao, K., Klein, A., Jaegermann, W. (2011) Optimized chemical bath deposited CdS layers for the improvement of CdTe solar cells, Solar Energy Materials and Solar Cells, 95, 816-820. doi:10.1016/j.solmat.2010.10.027
5. He, Z., Zhao, G., Weng, W., Du, P., Shen, G., Han, G. (2005) The difference between the transverse and in-plane resistivity of vacuum evaporated cadmium sulfide (CdS) thin films, Vacuum, 79, 14-18. doi:10.1016/j.vacuum.2005.01.004
6. Huang, L., Wei, Z.L., Zhang, F.M., Wu, X.S. (2015) Electronic and optical properties of CdS films deposited by evaporation, Journal of Alloys and Compounds, 648, 591-594. doi: 10.1016/j.jallcom.2015.07.041
7. Ibrahim, S.G., Ubale, A.U. (2014) Structural, electrical and optical properties of nanostructured Cd1_xFexS thin films deposited by chemical spray pyrolysis technique, Journal of Molecular Structure, 1076, 291-298. doi: 10.1016/j.molstruc.2014.07.065
8. Kim, D., Park, Y., Kim, M., Choi, Y., Park, Y.S., Lee, J. (2015) Optical and structural properties of sputtered CdS films for thin film solar cell applications, Materials Research Bulletin, 69, 78-83. doi: 10.1016/j.materresbull.2015.03.024

9. Kim, M.J., Kim, H.T. Kang, J.K., Kim, D.H., Lee, D.H., Lee, S.H., Sohn, S.H. (2010) Effects of the surface roughness on optical properties of CdS thin films, Molecular Crystals and Liquid Crystals, 532:1, 21/437-28/444. doi: 10.1080/15421406.2010.497099
10. Li, M., Li, J.C. (2006) Size effects on the band-gap of semiconductor compounds, Materials Letters, 60, 2526-2529. doi:10.1016/j.matlet.2006.01.032
11. Lu, C., Zhang, L., Zhang, Y., Liu, S., Liu, G. (2014) Fabrication of CdS/CdSe bilayer thin films by chemical bath deposition and electrodeposition, and their photoelectrochemical properties, Applied Surface Science, 319, 278-284. doi: 10.1016/j.apsusc.2014.08.158
12. Mouanga, M., Ricq, L., Douglade, G., Douglade, J., Berçot, P. (2006) Influence of coumarin on zinc electrodeposition, Surface and Coatings Technology, 201, 762-767.doi:10.1016/j.surfcoat.2005.12.036
13. Mouanga, M., Ricq, L., Ismaili, L., Refouvelet,V, Berçot, P. (2007) Behaviour of coumarin in chloride bath: Relationship with coumarin influence on zinc electrodeposition, Surface and Coatings Technology, 201, 7143-7148. doi:10.1016/j.surfcoat.2007.01.022
14. Pawar, S.M., Pawar, B.S., Kim, J.H., Joo, O.S., Lokhande, C.D. (2011) Recent status of chemical bath deposited metal chalcogenide and metal oxide thin films, Current Applied Physics, 11, 117-161. doi:10.1016/j.cap.2010.07.007
15. Rusu, G.G., Râmbu, A.P., Buta, V.E., Dobromir, M., Luca, D., Rusu, M. (2010) Structural and optical characterization of Al-doped ZnO films prepared by thermal oxidation of evaporated Zn/Al multilayered films, Materials Chemistry and Physics 123, 314-321.doi:10.1016/j.matchemphys.2010.04.022
16. Safinajafabadi, A., Sarraf-Mamoory, R., Karimi, Z. (2012) Effect of organic dispersants on structural and mechanical properties of Al2O3/ZrO2 composites, Materials Research Bulletin, 47, 4210-4215. doi: 10.1016/j.materresbull.2012.09.001
17. Shakir, M., Faraz, M., Khan, M.S., Al-Resayes, S.I. (2015) The photocatalytic, in vitro anthelmintic activity of biomolecule-inspired CdS nanoparticles, Comptes Rendus Chimie, 18, 966-978. doi: 10.1016/j.crci.2015.07.009
18. Shirokane, Y., Ichikawa, K., Suzuki, M. (2000) A novel enzymic determination of maltose, Carbohydrate Research, Carbohydrate Research, 329, 699-702. doi:10.1016/S0008-6215(00)00232-9
19. Uda, H., Yonezawa, H., Ohtsubo, Y., Kosaka, M., Sonomura, H. (2003) Thin CdS films prepared by metalorganic chemical vapor deposition, Solar Energy Materials and Solar Cells, 75, 219-226. doi:10.1016/S0927-0248(02)00163-0
20. Yücel E., Yücel Y., Durak M. (2016) Process optimization for window material CdS thin films grown by a successive ionic layer adsorption and reaction method using response surface methodology, Journal of Alloys and Compounds, 664, 530-537.doi: 10.1016/j.jallcom.2016.01.018
21. Yücel, E., Güler, N., Yücel, Y. (2014) Optimization of deposition conditions of CdS thin films using response surface methodology, Journal of Alloys and Compounds, 589, 207-212. doi: 10.1016/j.jallcom.2013.11.067
22. Yücel, E., Yücel, Y. (2015) Optimization of zinc sulfide thin film coating process using response surface methodology, Journal of Materials Science: Materials in Electronics, 26, 196-203. doi:10.1007/s10854-014-2383-3
23. Yücel, E., Yücel, Y. (2017) Fabrication and characterization of Sr-doped PbS thin Films grown by CBD, Ceramics International, 43, 407-413.doi: 10.1016/j.ceramint.2016.09.173