In this paper, Jin demonstrated a general method to synthesize 2D perovskites of desired layer thickness through gradual transformation from low n-value to higher n-value by tuning the temperature or time of the crystallization. It addresses the bottleneck of producing stable 2D halide perovskite with ahigh quantum-well number (n=1-6). Also, this work indicates that kinetics control…
Austin, Ayush, and Faiz worked on developing a novel barrier called the conductive adhesive barrier (or CAB) to protect the surface of the perovskite photoabsorber from electrolyte corrosion while retaining the charge collection efficiency by >99%. This enables the use of halide perovskite solar cells as photoelectrochemical cells that can directly convert sunlight to hydrogen…
Hao Zhang demonstrated a direct visualization of the carrier-lattice interactions in 2D halide perovskites for the first time. He did this by directly probing the lattice degrees of freedom in ps time scale using the ultrafast electron diffraction technique (MeV-UED) following the above bandgap high-density photoexcitation. Upon illumination, he observed a novel lattice behavior involving…
Andrew Torma and Wenbin Li, along with our collaborators at INSA Rennes, AFRL and ANL show that doping Mn2+ into the perovskite structure results in a lattice expansion which contrasts with the predicted contraction expected to arise from the B-site metal substitution, thus implying that Mn2+ does not replace the Pb2+ sites. This behavior was observed by performing…
Bin and Siraj along with our collaborators Dr. Jacky Even, Dr. Mercouri G. Kanatzidis, Dr. Jean-Christophe Blancon report that continuous light illumination leads to >1% contraction in the out-of-plane direction in two-dimensional hybrid perovskites, which is reversible and strongly dependent on the specific superlattice packing. The onset of the light-induced contraction is synchronized to…
Siraj Sidhik and Yafei Wang have successfully achieved High-phase purity 2D perovskite films with near-perfect vertical orientation using Lithium doped nickel oxide as the hole transport layer. They demonstrate that 2D PSCs with Li-doped NiOX exhibit excellent photostability, with T99 = 400 h at 1 sun and T90 of 100 h at 5 suns measured at a relative humidity of…
Dr. Aditya D. Mohite, Dr. Satishchandra Ogale, Dr. Mukherjee, and Dr. Chakraborty have published a collaborative work on the synthesis of a novel stable organic-inorganic perovskitoid material (a perovskite like hybrid-halide structure) using zwitterion cysteamine linker and demonstrated crystal-crystal transformation to Ruddlesden-Popper phase. They also demonstrate the application of the perovskitoid yellow phase by using…
Dr. Siraj Sidhik, Wenbin Li have developed a new “phase-selective” memory seeds method to fabricate 2D perovskite thin films with homogenous layer thickness (phase purity). The phase-selective method involves the dissolution of single-crystalline powders with a homogeneous perovskite layer thickness in desired solvents to fabricate thin films. The study is published in Advanced Materials. Photovoltaic devices…
Dr. Mohite, Dr. Jean Christophe, Dr. Even, Dr. Kanatzidis, Dr. Ajayan, and Los Alamos National Lab, have published a new collaborative work on the producing highly efficient photoelectric effect in halide perovskites for regenerative electron sources.The article reports efficient, regenerative, and low-cost electron sources based on solution-processed halide perovskites thin films when they are excited…
Dr. Aditya Mohite, Dr. Jean Christophe, along with our collaborators Dr. Jacky Even, Dr. Mercouri Kanatzidis, and Dr. Costas Stoumpos have published a review article in Nature Nanotechnology, discussing the current understanding of the structural properties of 2D halide perovskites, what makes them unique and compare them with conventional semiconductor materials, providing a broad understanding…