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Dry-pressed anodized titania nanotube/CH3NH3PbI3 single crystal heterojunctions: The beneficial role of N doping |
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| Authors: | Jelena Vujančević Pavao Andričević Anđelika Bjelajac Veljko Đokić Maja Popović Zlatko Rakočević Endre Horváth Márton Kollár Bálint Náfrádi Andreas Schiller Konrad Domanski László Forró Vera Pavlović Đorđe Janaćković |
| Affiliation: | 1. Institute of Technical Sciences of SASA, Knez Mihailova 35/IV, 11000, Belgrade, Serbia;2. Ecole Polytechnique Fédérale de Lausanne, Laboratory of Physics of Complex Matter (LPMC), CH-1015, Lausanne, Switzerland;3. University of Belgrade, Innovation Center of Faculty of the Technology and Metallurgy, Karnegijeva 4, 11000, Belgrade, Serbia;4. University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11000, Belgrade, Serbia;5. University of Belgrade, Vin?a Institute of Nuclear Sciences, Laboratory of Atomic Physics, Mike Alasa 12-14, 11001, Belgrade, Serbia;6. Fluxim AG, Katharina-Sulzer-Platz 2, CH-8400, Winterthur, Switzerland;7. University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11000, Belgrade, Serbia |
| Abstract: | Highly ordered, anodically grown TiO2 nanotubes on titanium supports were annealed in ammonia atmosphere in order to incorporate nitrogen doping (≤2?at.%) in the titanium oxide lattice. FESEM micrographs revealed nanotubes with an average outer diameter of 101.5?±?1.5?nm and an average wall thickness of about 13?nm. Anatase crystals were formed inside the tubes after annealing in ammonia atmosphere for 30?min. With further annealing, rutile peaks appeared due to the thermal oxidation of the foil and rise as the duration of heat treatment was increased. The concentration and chemical nature of nitrogen in the nanotube arrays can be correlated to the optical response of dry-pressed heterojunctions of doped TiO2/CH3NH3PbI3 single crystals. The N-TiO2/perovskite heterojunction with the highest amount of interstitial nitrogen exhibited an improved photocurrent, indicating the importance of the semiconductor doping-based heterojunction optimization strategies to deliver competitive levels of halide perovskite-based optoelectronic devices to be envisioned for urban infrastructures. |
| Keywords: | Titanium dioxide nanotubes Methylammonium lead triiodide photodetectors Optical properties Photocurrent |
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