Topic
Perovskite (structure)
About: Perovskite (structure) is a research topic. Over the lifetime, 51482 publications have been published within this topic receiving 1541750 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: The proposed OIHL passivation strategy positions perovskite QDs as an extremely promising prospect in future applications of high-definition displays, high-quality lightings, as well as solar cells.
Abstract: Perovskite quantum dots (QDs) with high photoluminescence quantum yields (PLQYs) and narrow emission peak hold promise for next-generation flexible and high-definition displays. However, perovskite QD films often suffer from low PLQYs due to the dynamic characteristics between the QD's surface and organic ligands and inefficient electrical transportation resulting from long hydrocarbon organic ligands as highly insulating barrier, which impair the ensuing device performance. Here, a general organic-inorganic hybrid ligand (OIHL) strategy is reported on to passivate perovskite QDs for highly efficient electroluminescent devices. Films based on QDs through OIHLs exhibit enhanced radiative recombination and effective electrical transportation properties compared to the primal QDs. After the OIHL passivation, QD-based light-emitting diodes (QLEDs) exhibit a maximum peak external quantum efficiency (EQE) of 16.48%, which is the most efficient electroluminescent device in the field of perovskite-based LEDs up to date. The proposed OIHL passivation strategy positions perovskite QDs as an extremely promising prospect in future applications of high-definition displays, high-quality lightings, as well as solar cells.
356 citations
TL;DR: In this article, an effective oleic acid (OA) ligand-assisted cation exchange strategy was proposed for controllable synthesis of Cs1−xFAxPbI3 QDs across the whole composition range.
Abstract: The mixed caesium and formamidinium lead triiodide perovskite system (Cs1−xFAxPbI3) in the form of quantum dots (QDs) offers a pathway towards stable perovskite-based photovoltaics and optoelectronics. However, it remains challenging to synthesize such multinary QDs with desirable properties for high-performance QD solar cells (QDSCs). Here we report an effective oleic acid (OA) ligand-assisted cation-exchange strategy that allows controllable synthesis of Cs1−xFAxPbI3 QDs across the whole composition range (x = 0–1), which is inaccessible in large-grain polycrystalline thin films. In an OA-rich environment, the cross-exchange of cations is facilitated, enabling rapid formation of Cs1−xFAxPbI3 QDs with reduced defect density. The hero Cs0.5FA0.5PbI3 QDSC achieves a certified record power conversion efficiency (PCE) of 16.6% with negligible hysteresis. We further demonstrate that the QD devices exhibit substantially enhanced photostability compared with their thin-film counterparts because of suppressed phase segregation, and they retain 94% of the original PCE under continuous 1-sun illumination for 600 h.
355 citations
TL;DR: In this paper, the authors demonstrate experimentally the promise of cesium titanium(IV) bromide (Cs 2 TiBr 6 ), a part of the Ti-based vacancy-ordered double-perovskite halides family, in perovsite solar cells (PSCs) and show that high quality Cs 2TiBr 6 thin films can be prepared through a facile low-temperature vapor-based method.
355 citations
TL;DR: In this paper, the authors measured reflection, luminescence and absorption spectra in an exciton region of (C 10 H 21 NH 3 ) 2 PbI 4, which is determined to be of layered perovskite type by X-ray diffraction.
355 citations
TL;DR: The light-absorbing perovskite layer fabricated using the NH4Cl additive shows high crystallinity and better morphology and the resulting solar cells gave a decent power conversion efficiency and a fill factor record.
Abstract: The light-absorbing perovskite layer fabricated using the NH4Cl additive shows high crystallinity and better morphology. The resulting solar cells gave a decent power conversion efficiency of 9.93% and a fill factor record of 80.11%. This work provides a very simple but effective approach to enhance the power conversion efficiency of perovskite solar cells.
355 citations