| 초록 |
Cesium lead halide (CsPbX3, X = I, Br, Cl) all-inorganic perovskites are attractive light harvesting absorber for stable perovskite solar cells (PSCs). Especially, cesium lead bromide (CsPbBr3) is considered as a candidate material for stable PSC platforms, because of its complete perovskite structure and good humidity tolerance. In spite of its stability and high carrier mobility, the PSCs with CsPbBr3 have performance problem, which is caused by its wide band gap (2.3 eV). It restricts light absorption range and causes large energy level mismatch at TiO2 (-4.2 eV)/CsPbBr3 (-3.3 eV) and CsPbBr3 (-5.6 eV)/Au (-5.1 eV) interfaces. To resolve these problems and improve light absorption, we introduced chalcogenide quantum dots (QDs) at the CsPbBr3 layer. By incorporating QDs, current density and fill factor of PSCs were enhanced. This work was supported by the DGIST R&D Program of the Ministry of Science and ICT of Korea (19-ET-01). |
