3 research outputs found
Laser Direct Write Synthesis of Lead Halide Perovskites
Lead halide perovskites are increasingly
considered for applications
beyond photovoltaics, for example, light emission and detection, where
an ability to pattern and prototype microscale geometries can facilitate
the incorporation of this class of materials into devices. Here we
demonstrate laser direct write of lead halide perovskites, a remarkably
simple procedure that takes advantage of the inverse dependence between
perovskite solubility and temperature by using a laser to induce localized
heating of an absorbing substrate. We demonstrate arbitrary pattern
formation of crystalline CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> on a range of substrates and fabricate and characterize a microscale
photodetector using this approach. This direct write methodology provides
a path forward for the prototyping and production of perovskite-based
devices
Lithographically Defined Three-Dimensional Graphene Structures
A simple and facile method to fabricate 3D graphene architectures is presented. Pyrolyzed photoresist films (PPF) can easily be patterned into a variety of 2D and 3D structures. We demonstrate how prestructured PPF can be chemically converted into hollow, interconnected 3D multilayered graphene structures having pore sizes around 500 nm. Electrodes formed from these structures exhibit excellent electrochemical properties including high surface area and steady-state mass transport profiles due to a unique combination of 3D pore structure and the intrinsic advantages of electron transport in graphene, which makes this material a promising candidate for microbattery and sensing applications