2 research outputs found
Operando Imaging of Crystallinity-Dependent Multicolor Thermochromic Processes for Single Hydrated Hybrid Perovskite Particles
The thermochromic properties of hydrated metal halide
perovskites
(MHPs) are promising for applications in smart windows, solar cells,
optical sensors, and information storage. Traditional ensemble characterization
methods always study the averaged thermochromic activity, lacking
the accurate structure鈥揳ctivity correlation. Here we utilize
dark-field microscopy (DFM) to in situ image the thermochromic processes
of single isolated hydrated hybrid perovskite (CH3NH3)4PbI6鈥搙Clx路2H2O (MA4PbI6鈥搙Clx路2H2O) microparticles. The thermal-induced dehydration transition
is demonstrated to alter the color of single MA4PbI6鈥搙Clx路2H2O particles. Operando single-particle mapping results reveal
the significant intra- and interparticle variations of thermochromic
behaviors, yielding unexpected single or multistep multicolor thermochromic
processes. These phenomena are confirmed to be governed by the crystallinity
of single MA4PbI6鈥搙Clx路2H2O particles that results
in distinct composition-dependent bandgaps and thermal decomposition
pathways. The present work highlights the important role of single-particle
imaging for resolving the intrinsic thermochromic characteristic of
hydrated MHPs, therefore opening a way for rational design of stimuli-responsive
materials
Operando Imaging of Crystallinity-Dependent Multicolor Thermochromic Processes for Single Hydrated Hybrid Perovskite Particles
The thermochromic properties of hydrated metal halide
perovskites
(MHPs) are promising for applications in smart windows, solar cells,
optical sensors, and information storage. Traditional ensemble characterization
methods always study the averaged thermochromic activity, lacking
the accurate structure鈥揳ctivity correlation. Here we utilize
dark-field microscopy (DFM) to in situ image the thermochromic processes
of single isolated hydrated hybrid perovskite (CH3NH3)4PbI6鈥搙Clx路2H2O (MA4PbI6鈥搙Clx路2H2O) microparticles. The thermal-induced dehydration transition
is demonstrated to alter the color of single MA4PbI6鈥搙Clx路2H2O particles. Operando single-particle mapping results reveal
the significant intra- and interparticle variations of thermochromic
behaviors, yielding unexpected single or multistep multicolor thermochromic
processes. These phenomena are confirmed to be governed by the crystallinity
of single MA4PbI6鈥搙Clx路2H2O particles that results
in distinct composition-dependent bandgaps and thermal decomposition
pathways. The present work highlights the important role of single-particle
imaging for resolving the intrinsic thermochromic characteristic of
hydrated MHPs, therefore opening a way for rational design of stimuli-responsive
materials