Browsing by Author "Savaş, Müzeyyen"

Now showing 1 - 1 of 1

Işık Emici Optoelektronik Cihazların Üretimi ve Yeni Uygulamaları
(Abdullah Gül Üniversitesi, Fen Bilimleri Enstitüsü, 2022) Savaş, Müzeyyen; Erdem, Talha
Fabrication of optoelectronic devices relies on expensive, energy-consuming conventional tools including chemical vapor deposition, lithography, and metal evaporation. Developing an alternative technology would contribute to the efforts on achieving a sustainable optoelectronics technology. Keeping this in our focus, here we present a simple technique to fabricate visible photodetectors. These fully solution-processed and transparent metal-semiconductor-metal photodetectors employ silver nanowires (Ag NW) as the transparent electrodes replacing the indium-tin-oxide (ITO) commonly used in optoelectronic devices. By repeatedly spin coating Ag NW on a glass substrate followed by the coating of ZnO nanoparticles, we obtained a highly conductive transparent electrode reaching a sheet resistance of 95 Ω/□. The transmittance of the Ag NW-ZnO films was 84% at 450 nm while the transmittance of the ITO films was 90% at the same wavelength. Following the formation of the conductive film, we scratched it using a heated surgical blade to open a gap which is ~30 µm forming an insulating line. As the active layer, we drop-casted red-emitting CdSe/ZnS core-shell colloidal quantum dots (CQDs) onto this gap. These visible CQD-based photodetectors exhibited responsivities and detectivities up to 8.5 mA/W and 0.95x109 Jones, respectively. These proof-of-concept photodetectors show that the environmentally friendly, low-cost, and energy-saving technique presented here can be an alternative to conventional, high-cost, and energy-hungry techniques while fabricating light-harvesting devices.