title: Facile synthesis of GO@SnO2/TiO2nanofibers and their behavior in photovoltaics.
abstract: Chemical doping is a widely-used strategy to improve the performance of TiO2for the dye-sensitized solar cells (DSCs). However, the effect of two efficient dopants has been rarely investigated. We present the synthesis of GO@SnO2/TiO2nanofibers (NFs) by a facile method using electrospinning and hydrothermal processes. The synthesized NFs are described in terms of morphology, crystallinity and chemistry through FESEM, TEM, HR-TEM, XRD, EDX, XPS, FT-IR and Raman spectra. As the results, the axial ratio and the average diameter of NFs decreased after the hydrothermal treatment and calcination process, respectively. The prepared Titania-based nanofibers have 81.82% anatase and 18.18% rutile-structure. The developed materials are applied as working electrodes of DSCs. The photovoltaic performances showed that the efficiency of the device employed GO@SnO2/TiO2photoanode gave 5.41%, which was higher than those of cells fabricated with SnO2/TiO2NFs (3.41%) and GO@TiO2NFs (4.52%) photoanodes. The photovoltaic parameters such as Jsc, Voc, FF and Rctare calculated and found to be 11.19mAcm-2, 0.72V, 0.67 and 9.26Ω, respectively. The high photovoltaic response of DSC based of GO@SnO2/TiO2NFs may be attributed to the large surface area of the NFs, and the low electron recombination. Furthermore, the start-stop switches of the cell devices with the developed photoanode affirmed the stability and photovoltaic performance of the cell.
authors.affiliation: Bionanosystem Engineering Department, Chonbuk National University, Jeonju 561-756, Republic of Korea; Chemistry Department, Faculty of Science, Sohag University, Sohag 82524, Egypt.
authors.forename: Ibrahim M A
authors.initials: IMA
authors.lastname: Mohamed
authors.affiliation: Department of Chemical Engineering & Applied Chemistry, Chungnam National University, 220 Gung-Dong, Yuseong-Gu, Daejeon 305-764, Republic of Korea.
authors.forename: Van-Duong
authors.initials: VD
authors.lastname: Dao
authors.affiliation: Bionanosystem Engineering Department, Chonbuk National University, Jeonju 561-756, Republic of Korea.
authors.forename: Ahmed S
authors.initials: AS
authors.lastname: Yasin
authors.affiliation: Department of Chemical Engineering & Applied Chemistry, Chungnam National University, 220 Gung-Dong, Yuseong-Gu, Daejeon 305-764, Republic of Korea.
authors.forename: Ho-Suk
authors.initials: HS
authors.lastname: Choi
authors.affiliation: Mechanical Engineering Department, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia; Materials Engineering and Design Department, Aswan University, Aswan, Egypt.
authors.forename: KhalilAbdelrazek
authors.initials: K
authors.lastname: Khalil
authors.affiliation: Bionanosystem Engineering Department, Chonbuk National University, Jeonju 561-756, Republic of Korea; Chemical Engineering Department, Faculty of Engineering, Minia University, El-Minia, Egypt. Electronic address: nasser@jbnu.ac.kr.
authors.forename: Nasser A M
authors.initials: NAM
authors.lastname: Barakat
keywords: Dye-sensitized solar cells; GO@SnO(2)/TiO(2); Nanofibers; Photoanode