Design, fabrication and characterization of n-si columnar structures for solar cell applications

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dc.contributor.authorDevelioglu, Aysegul
dc.contributor.authorTrabzon, Levent
dc.contributor.authorAlphan, Yunus
dc.date.accessioned2024-12-24T19:10:10Z
dc.date.available2024-12-24T19:10:10Z
dc.date.issued2020
dc.departmentSiirt Üniversitesi
dc.description.abstractBackground: Glancing Angle Deposition (GLAD) provides oblique deposition and substrate motion to engineer thin film microstructures in three dimensions on nano scale. Using this technique zigzag, chevrons, staircase, post, helical and various type of nanostructures including 3-D multilayers can be obtained from various metals with controllable morphologies. The aim of the study is to increase surface porosity and junction using GLAD method area for thin film solar cells and therefore to increase p-n junction area. This provides efficient charge separation and strong light absorption. Methods: Glancing angle deposition using e-beam evaporation technique has been employed to create 3-D silicon nano-structures on the surface. Al and Ag contact layers were deposited by thermal evaporation technique. Hole-conductor polymer PEDOT: PSS was spin coated onto n type silicon thin film. Reflec-tance spectra were measured using UV-VIS spectroscopy. Scanning electron microscopy was used to image surface and cross-section with and without PEDOT: PSS. Also, transmission spectra of PEDOT: PSS was measured using UV-VIS spectroscopy. Surface wettability properties and contact angles of silicon samples were measured by contact angle measurement with water. Results: Columnar structures possess less reflection compared to the flat surface depending on surface porosity. This phenomenon shows that these structures can be used as anti-reflection coatings for solar cells and optical devices to decrease reflectivity and increase light harvesting with higher efficiency. Contact angle decreases when surface roughness increases therefore we can see that columnar structures are more hydrophilic compared to dense films. Flat silicon has 98° contact angle while columnar structures have 71° and 61°. PEDOT: PSS exhibits high transparency in the range from 200 to 1100 nm of wavelength of light, which resembles to solar radiation inside the atmosphere. Also, SEM images of the samples show that silicon columnar structures form better contact with PEDOT: PSS than flat surface. Conclusion: GLAD technique has been used to achieve homogenous rough surface by e-beam evaporation. Both cross-sectional and top-view SEM images show that columnar structures have higher porosity than flat surfaces. The response of UV-VIS spectroscopy shows that columnar structures have less reflection due to highly porous surface. With increasing incident flux angle, antireflection property of the surfaces was enhanced by surpassing the surface reflection. Due to the reduced hydrophobicity of porous structures, organic polymer can be distributed homogenously in between the columnar structures with increased p-n junction interface area. PEDOT: PSS is highly conductive, and it is highly transparent material in the range of the wavelength typically seen in the solar radiation. This makes it easier for light to reach to Si interface to generate electrons and holes. These results provide better understanding of Si-based heterojunction solar cells efficiency improvement with surface modification. This study also shows dependency of optical and electrical activity to surface geometry and surface porosity. © 2020 Bentham Science Publishers.
dc.identifier.doi10.2174/2210681208666181019123035
dc.identifier.endpage79
dc.identifier.issn2210-6812
dc.identifier.issue1
dc.identifier.scopus2-s2.0-85079853375
dc.identifier.scopusqualityQ3
dc.identifier.startpage74
dc.identifier.urihttps://doi.org10.2174/2210681208666181019123035
dc.identifier.urihttps://hdl.handle.net/20.500.12604/3982
dc.identifier.volume10
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherBentham Science Publishers
dc.relation.ispartofNanoscience and Nanotechnology - Asia
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241222
dc.subjectGlancing Angle Deposition (GLAD)
dc.subjectPhotovoltaics
dc.subjectScanning Electron Microscopy (SEM)
dc.subjectSculptured Thin Films (STF)
dc.subjectStructured Thin Films (STFs)
dc.subjectThin film microstructures
dc.titleDesign, fabrication and characterization of n-si columnar structures for solar cell applications
dc.typeArticle

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