Abstract: A radiation detector includes a p-i-n architecture including a p-type contact layer, an n-type contact layer, and an intrinsic layer between the p-type contact layer and the n-type contact layer. The intrinsic layer includes a thin film comprising a highly crystalline 2D layered perovskite material. The radiation detectors according to embodiments of the present disclosure generate high open circuit voltages, have good detecting photon density limits and high sensitivities, and can be self-powered.

Abstract: A thin film for an optoelectronic device includes a layered 2D perovskite material. The thin film including the layered 2D perovskite material forms a substantially or nearly single-crystalline highly uniform thin film with strongly preferential out-of-plane alignment of the inorganic perovskite layers. This single-crystalline, highly uniform, and highly aligned thin film of the layered 2D perovskite material may thereby facilitate efficient charge transport in an optoelectronic device.

Abstract: Hybrid organic-inorganic perovskite thin films with average grain sizes of at least 50 micrometers were prepared and employed in solar cells. The PCE values of the solar cells did not degrade with the direction or the scan-rate of the applied voltage. The larger average grain sizes are believed to assist in reducing the influence of defect states on carrier recombination. The tunability of PCE with substrate temperature may be correlated to the quality of the crystalline perovskite formed using the hot-casting procedure. The larger average grain sizes lead to good crystalline quality, low defect density, and high carrier mobility. The process for growing hybrid organic-inorganic perovskites may be applicable to the preparation of other materials to overcome problems related to polydispersity, defect formation, and grain boundary recombination.