2.2.2. Preparation of oleic acid and pyridine capped perovskite solar cells

For OA-CdS modified perovskite solar cells, oleic acid capped quantum dots dissolved in chlorobenzene (5 mg/mL) were spin casted onto TiO₂ surface at 5000 rpm for 40s and dried at 100 °C for 5 min. Then, perovskite solution was spin casted as explained in text above. PYR-CdS modified solar cells were prepared by pyridine washing after coating OA capped CdS. For this concept, after coating OA capped CdS on TiO₂ surface, 70 ul pyridine was dropped on film during spinning at 5000 rpm and then dried at 100 °C 5 min. After pyridine treatment, perovskite layer was deposited as explained above.