A5061630046- Perovskite Materials and Applications
- Solid-state spectroscopy and crystallography
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- 2D Materials and Applications
- Thermal Expansion and Ionic Conductivity
- Natural Language Processing Techniques
- Conducting polymers and applications
- Model-Driven Software Engineering Techniques
- Semantic Web and Ontologies
- Coral and Marine Ecosystems Studies
Shanghai Jiao Tong University
2016-2017
Zhongnan University of Economics and Law
2010
Among various all-inorganic halide perovskites exhibiting better stability than organic-inorganic perovskites, α-CsPbI3 with the most suitable band gap for tandem solar cell application faces an issue of phase instability under ambient conditions. We discovered that a small amount two-dimensional (2D) EDAPbI4 perovskite containing ethylenediamine (EDA) cation stabilizes to avoid undesirable formation nonperovskite δ phase. Moreover, not only 2D facilitate films high at room temperature...
Abstract Organometallic halide perovskite solar cells (PSCs) have shown great promise as a low-cost, high-efficiency photovoltaic technology. Structural and electro-optical properties of the absorber layer are most critical to device operation characteristics. Here we present facile fabrication PSCs based on compact, large-grain, pinhole-free CH 3 NH PbI 3−x Br x (MAPbI 3− ) thin films with high reproducibility. A simple methylammonium bromide (MABr) treatment via spin-coating proper MABr...
The perovskite quantum dots are usually synthesized by solution chemistry and then fabricated into film for device application with some extra process. Here it is reported the first time to in situ formation of a crosslinked 2D/3D NH 3 C 4 H 9 COO(CH ) n Pb Br planar films controllable confine via bifunctional amino acid crosslinkage, which comparable CH PbBr dots. These atomic layer facilely tuned addition bi‐functional 5‐aminovaleric (Ava) 2 COOH regular (CH )PbBr (MAPbBr precursor...
Organolead halide perovskites exhibit superior photoelectric properties, which have given rise to the perovskite-based solar cells whose power conversion efficiency has rapidly reached above 20% in past few years. However, also encountered problems such as current–voltage hysteresis and degradation under practical working conditions. Yet investigations into intrinsic chemical nature of perovskite material its role on performance are relatively rare. In this work, Raman spectroscopy is...
Abstract High‐quality phase‐pure MA 1− x FA PbI 3 planar films (MA=methylammonium, FA=formamidinium) with extended absorption and enhanced thermal stability are difficult to deposit by regular simple solution chemistry approaches owing crystallization competition between the easy‐to‐crystallize but unwanted δ‐FAPbI /MAPbI requiring rigid conditions. Here A 2D–3D conversion transform compact 2D mixed composition HMA Cl perovskite precursor into 3D ( x= 0.1–0.9) perovskites is presented. The...
High quality CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>/CH<sub>3</sub>NH<sub>3</sub>PbI<sub>2</sub>Br perovskite films were facilely deposited by spin coating HI + PbI<sub>2</sub>/HBr PbI<sub>2</sub> solution in CH<sub>3</sub>NH<sub>2</sub> atmospheres.
We demonstrate a facile gas solid reaction of PbBr<sub>2</sub> film with CH<sub>3</sub>NH<sub>2</sub> under ambient conditions to form luminescent quantum confined CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> perovskite film.
The CH3NH3PbI3 (MAPbI3) perovskite was usually prepared by high-purity PbI2 with high cost. low cost and low-purity seldom reported for fabrication of MAPbI3 because it cannot even dissolve well in widely adopted solvent DMF. We developed an easy method to adapt quality just the simple addition some hydrochloric acid into mixture PbI2, MAI This straightforward can not only help reacting impurities DMF, but also lead a successful high-quality solar cells up 14.80% efficiency comparable precursors.
High-quality phase-pure MA1−xFAxPbI3 planar films (MA=methylammonium, FA=formamidinium) with extended absorption and enhanced thermal stability are difficult to deposit by regular simple solution chemistry approaches owing crystallization competition between the easy-to-crystallize but unwanted δ-FAPbI3/MAPbI3 FAxMA1−xPbI3 requiring rigid conditions. Here A 2D–3D conversion transform compact 2D mixed composition HMA1−xFAxPbI3Cl perovskite precursor into 3D (x=0.1–0.9) perovskites is...
Graph grammar has been employed as a tool to express formal logic of graph structures. Among different mechanisms, pullback categorical grammars have proved be intrinsically context-free. We will show in this paper that kind can used for modeling mechanism which generates square grids and only grids. With semantics good candidate studying semantic web, or grid.