VNU-UET Repository: No conditions. Results ordered -Date Deposited. 2024-03-28T14:23:59ZEPrintshttp://eprints.uet.vnu.edu.vn/images/sitelogo.pnghttps://eprints.uet.vnu.edu.vn/eprints/2019-06-03T04:19:45Z2019-06-03T04:19:45Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/3451This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/34512019-06-03T04:19:45ZCharacterization of performance parameters of organic solar cells with a buffer ZnO layerBy embedding a thin ZnO layer sandwiched between the hole transport and photoactive layers, organic solar cells (OSC) based on poly(3-hexylthiophene) (P3HT) were prepared by spincoating. UV-Vis spectra of the composite films showed that ZnO exhibited a suitable buffer layer that could block holes movement throughout the heterojunction of ITO/ZnO. The enhancement in the fill factor (FF) of the buffer-OSC (BOSC) is attributed to the presence of nanoheterojunctions of ZnO/PCBM and ZnO/ITO. For the normal temperature, the increase of the open-circuit potential and short-circuit current resulted in an overall increase of the energy conversion efficiency. Comparing to OSCs without buffer layer (WOSC), the laminar structure of ITO/ZnO/P3HT/PCBM/Li/Al cells possess a much larger photovoltaic energy conversion efficiency, namely 2.12% (for BOSC) compared to 1.75% (for WOSC).Nang Dinh Nguyendinhnn@vnu.edu.vnHyung-Kook KimDinh Lam Nguyenlamnd2005@vnu.edu.vnDuc Cuong Nguyencuongnd@vnu.edu.vnPhuong Hoai Nam Nguyennamnph@vnu.edu.vn2015-11-19T07:34:37Z2015-11-19T07:35:31Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/1253This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/12532015-11-19T07:34:37ZLuminescent core–shell Fe3O4@Gd2O3:Er3+,Li+Composite Particles with Enhanced Optical PropertiesBifunctional magneto-optical nanocomposites with Fe3O4 nanoparticles as a core and erbium and lithium codoped gadolinium (Gd2O3:Er3+, Li+) as the shell were synthesized successfully using a simple urea homogeneous precipitation method. The fabricated Fe3O4@Gd2O3:Er3+, Li+ particles were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, photoluminescence spectroscopy and quantum design vibrating sample magnetometry. The upconversion emission intensity was enhanced significantly comparing to that without Li+ ions. These bifunctional composites are expected to be potentially applied for drug delivery, cell separation and bioimaging.Thi Hong Ha VuSh. Atabaev TimurNang Dinh Nguyendinhnn@vnu.edu.vnYoon-Hwae HwangHyung-Kook Kim