Yazar "Tuzemen, Sebahattin" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Improved perovskite film quality and solar cell performances using dual single solution coating
    (Aip Publishing, 2017) Baltakesmez, Ali; Biber, Mehmet; Tuzemen, Sebahattin
    In this study, we present high quality perovskite CH3NH3PbI3-xClx thin films prepared by a combination of static and dynamic coating approaches, named dual single solution coating. Static coating, dynamic coating and the combination of these are comparatively studied. Scanning electron microscopy, X-ray diffraction, atomic force microscopy, UV-visible spectroscopy, and photoluminescence techniques are used for the determination of morphological, structural, and optical properties of thin films prepared using different coating approaches and deposition temperatures. All the coating approaches are repeated at room temperature and with hot deposition. The high quality and density CH3NH3PbI3-xClx films with full surface coverage are obtained using thedual single solution coating, particularly with hot-deposition. The perovskite solar cells prepared by the dual coating approach with hot deposition have better values for all the performance parameters in comparison to the other coating approaches, resulting in high efficiencies. The best device has a short circuit current of 22.03 mA/cm(2), an open circuit voltage of 0.91V, a fill factor of 0.73, and a power conversion efficiency of 14.68% from short-circuit to forward bias, and 22.39 mA/cm(2), 0.91 V, 75% and 15.32% for the vice-versa, respectively. Published by AIP Publishing.
  • Küçük Resim Yok
    Öğe
    Review of the fundamental issues in new generation high efficiency perovskite solar cells
    (Elsevier, 2019) Baltakesmez, Ali; Biber, Mehmet; Tuzemen, Sebahattin
    This is a mini review of the fundamental issues in producing high efficiency solar cells. We have raised many important issues that limit the power conversion efficiency, and introduced the solutions in particular to perovskite solar cell structures. We supposedly estimate very high efficiencies over detailed balance or Schockley-Quessier limit up to 50 %, having applications such as tandem cells, light concentration, inter-band activities with deep levels, photon upconversion and quantum dots together with some unique processing systems. (C) 2019 Elsevier Ltd. All rights reserved.