Publication date: 15th November 2022
Lead-halide perovskite nanoparticles are a very promising material because of their optoelectronic properties and chemical versatility [1]. By changing the chemical composition, different bandgap energies can be achieved and hence, different absorption and emission spectra, which can be further tailored when the quantum confinement regime is achieved. Additional advantages of perovskite nanoparticles functional thin-films include low-cost deposition techniques and less material consumption [2]. However, conventional methods to fabricate perovskite nanoparticles in suspension, such as hot injection, make it challenging to develop functional thin-films based on these materials.
The method proposed here uses a metal-organic host matrix based on a sol-gel approach [3] that allows us to obtain perovskite nanoparticles by exposing the films at high humidity atmospheres (70% - 100% RH) after deposition by spin coating. Conductive thin-films with promising optoelectrical properties can be readily obtained, even without annealing, by this simple mechanism. We will discuss the crystallisation mechanisms and the factors that control the main properties of the nanoparticles.
M.M.A acknowledges her FPI PhD contract with reference PRE2021-099951 associated to the project with reference PID2020-119628RB-C31.
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