Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
Cesium lead halide (CsPbX3, X = I, Br, Cl) all-inorganic perovskite materials are regarded as a promising material for light harvesting absorber for stable perovskite solar cells (PSCs). Especially, cesium lead bromide (CsPbBr3), which occurs at standard temperature and pressure with complete perovskite structure and has a good humidity tolerance, is considered a candidate material for stable PSC platforms. In spite of its stability and high carrier mobility, the PSCs with CsPbBr3 absorber have performance problem, which is caused by its wide band gap. The inorganic perovskite CsPbBr3 has band gap of 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 energy level difference and improve electron extraction, we introduced metal chalcogenide quantum dots (QDs) at the interface of mesoporous TiO2 (mp-TiO2) and CsPbBr3. The QDs consisted of 4 elements with band gap energy of 1.55 eV. By incorporating QDs on mp-TiO2, current density and fill factor of PSCs were enhanced.
This work was supported by the DGIST R&D Program of the Ministry of Science, ICT and Future Planning of Korea (18-ET-01).
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