Abstract
Double perovskites have shown great potentials in addressing the toxicity and instability issues of lead halide perovskites toward practical applications. However, fabrication of high‐quality double perovskite thin films has remained challenging. Here, sequential vapor deposition is used to fabricate high‐quality Cs2AgBiCl6 perovskite films with balanced stoichiometry, superior morphology, and highly oriented crystallinity, with an indirect bandgap of 2.41 eV. Using a diode structure, self‐powered Cs2AgBiCl6 ultraviolet (UV) photodetectors are demonstrated with high selectivity centered at 370 nm, with low dark current density (≈10−7 mA cm−2), high photoresponsivity (≈10 mA W−1), and detectivity (≈1012 Jones). Its detectivity is among the highest in all double‐perovskite‐based photodetectors reported to date and surpassing the performance of other perovskite photodetectors as well as metal oxide in the UV range. The devices also show excellent environmental and irradiation stability comparable to state‐of‐the‐art UV detectors. The findings help pave the way toward application of double perovskites in optoelectronic devices.
Highlights
Double perovskites have shown great potentials in addressing the toxicity and have hindered their broader application in scenarios such as low-cost disposable deinstability issues of lead halide perovskites toward practical applications
We demonstrate high-performance Cs2AgBiCl6 perovskite photodetector enabled by sequential vapor deposition technique.[1c,18] By carefully tuning the compositional ratio and annealing process, we achieve Cs2AgBiCl6 films with balanced stoichiometry, high crystallinity, and superior morphology
X-ray diffraction (XRD) patterns of the perovskite films annealed at different temperatures are consistent with standard diffraction patterns as well as values of single crystals[12a] and nanocrystals in literature.[17b,c] This confirms the formation of phase-pure Cs2AgBiCl6 double perovskites from the sequential vapor deposition method (Figure 1e).[20]
Summary
Double perovskites have shown great potentials in addressing the toxicity and have hindered their broader application in scenarios such as low-cost disposable deinstability issues of lead halide perovskites toward practical applications. Sequential vapor deposition is used to fabricate high-quality Cs2AgBiCl6 perovskite films with balanced stoichiometry, superior morphology, and highly oriented crystallinity, with an indirect and flexible devices.
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