Akademik Veri Yönetim Sistemi
Tezin Türü: Doktora
Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Bilimleri Enstitüsü, Fen Bilimleri Enstitüsü, Türkiye
Tezin Onay Tarihi: 2018
Öğrenci: KEREM ÇAĞATAY İÇLİ
Eş Danışman: AHMET MACİT ÖZENBAŞ, BURCU AKATA KURÇ
Özet:In this work, nanoparticles of lithium doped nickel oxide (NiO) were synthesized by common wet chemistry methods like precipitation, ultrasonic spray pyrolysis and flame spray pyrolysis methods. Synthesized nanoparticles were employed in fully metal oxide mesoscopic perovskite based solar cells. Lithium doping of NiO was achieved by ultrasonic spray pyrolysis method and flame spray pyrolysis methods. Flame spray pyrolysis method was used to synthesize yttrium doped titanium dioxide (TiO2) and magnesium oxide (MgO) nanoparticles. NiO nanoparticles which were produced by precipitation technique yielded 20-30 nm particles sizes with homogeneous distribution size and dispersed in isopropanol by ball milling without addition of any surfactants. Stable dispersions were deposited on a mesoscopic perovskite solar cell as the hole transport medium as a replacement of polymeric hole conductors and 10.89% efficiency was obtained for the optimized structure. Electrochemical impedance spectroscopy measurements revealed that recombination resistance of cells were greatly enhanced upon addition of the NiO electron blocking layer and electron blocking property of the NiO was also confirmed by ultraviolet photoelectron electron spectroscopy. Lithium doped NiO nanoparticles, ytrrium doped TiO2 nanoparticles and MgO nanoparticles were produced by a unique methanol combustion flame synthesis method and employed as the mesoprous layers in carbon based perovskite solar cells. It was shown that enhancement of the electrical conductivity of the lithium doped NiO and yttrium TiO2 layers lead to a reduction of the overall resistivity of the carbon based perovskite solar cell and efficiency of 9.63% was achieved.