Induced Growth of CsPbBr3 Perovskite Films by Incorporating Metal Chalcogenide Quantum Dots in PbBr2 Films for Performance Enhancement of Inorganic Perovskite Solar Cells

• DOI: 10.1021/acsaem.0c01152
• Publication Date: 2020-10-20T15:24:36Z
• Authors: Eui Jin Lee; Dae-Hwan Kim; Robert P. H. Chang; Dae-Kue Hwang
• Keywords: Perovskite solar cell

Cesium lead bromide (CsPbBr3), an inorganic perovskite material with a large band gap energy (Eg = 2.3 eV), is great candidate to produce stable and semitransparent solar cell (PSC) platforms owing its complete structure in humid environments. We synthesized quantum dots (QDs) composed of five atoms, copper (Cu), zinc (Zn), indium (In), sulfur (S), selenium (Se; CZISSe QDs), incorporated them into CsPbBr3 films. To enable the dispersion CsPbBr3-capped QDs PbBr2 solution, we used ligand-exchange method substitute shell instead long organic capping chains. functioned as crystal nuclei seeds film promoted crystallization CsPbBr3. Furthermore, they were present mesoporous TiO2–CsPbBr3 layer, improving extraction transport electrons from light absorption layer TiO2. Consequently, power conversion efficiency QD-containing PSC was enhanced by 20.6% compared that QD-free PSC.