High-Performance Deep UltravioletPhotodetector Based on a One-DimensionalLead-Free Halide Perovskite CsCu2I3 Film withHigh Stability
Figshare documentation (Figshare (United Kingdom))(2020)
摘要
Lead
halide perovskites have received much attention in the field
of optoelectronic devices. However, the environment-unfriendly nature
and intrinsic instability of these perovskites hamper their commercial
applications. In this work, one novel one-dimensional lead-free halide
perovskite with high stability, CsCu2I3, was
prepared via an antisolvent-assisted crystallization method. The prepared
CsCu2I3 bears a high exciton binding energy
of ∼105 meV and a high photoluminescence quantum yield of 12.3%.
We fabricated a deep ultraviolet photodetector based on a CsCu2I3 film that is nearly blind to 405 nm visible
light but is sensitive to 265 and 365 nm illumination. The device
exhibits excellent reproducibility and a high Ilight/Idark ratio of 22 under 265
nm illumination. Furthermore, the responsivity, specific detectivity,
and external quantum efficiency are as high as 22.1 mA/W, 1.2 ×
1011 Jones, and 10.3% under a light density of 0.305 mW/cm2, respectively. These findings demonstrate that CsCu2I3 perovskites should have great potential for future
optoelectronics.
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关键词
high-performance,one-dimensionallead-free
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