A 200-nm length TiO2 nanorod array with a diameter of 13 nm and areal density of 1100 µm−2 for efficient perovskite solar cells

摘要: Abstract Rutile TiO 2 nanorod arrays with lengths of 200 nm, 490 nm and 800 nm were prepared by a hydrothermal method using an aqueous grown solution 38 mM titanium isopropoxide 6 M hydrochloric acid at 170 °C for 75 min, 105 min 115 min, respectively. CH 3 NH PbI 3−x Br x thin films obtained two-step sequential deposition 1.7 M ·DMSO complex precursor 0.465 M isopropanol methylammonium halide mixture molar ratio I/CH = 85/15. The influence the microstructure array on charge separation perovskite/TiO interface photovoltaic performance corresponding solar cells investigated. Perovskite based 200-nm length diameter 13 nm areal density 1100 µm −2 exhibited best photoelectric conversion efficiency (PCE) 16.23%, open-circuit voltage ( V oc ) 1.02 V, short-circuit photocurrent J sc 21.98 mA cm fill factor (FF) 0.72, as well average PCE 15.63 ± 0.60%, 1.00 0.03 V, 21.80 0.81 mA cm FF 0.71 0.02 under illumination simulated AM 1.5 sunlight (100 mA cm ).