Self-Poweredand Broadband Lead-Free Inorganic PerovskitePhotodetector with High Stability
2020
Metal
halide perovskite materials have opened up a great opportunity
for high-performance optoelectronic devices owing to their extraordinary
optoelectronic properties. More than lead halide ones, stable and
nontoxic bismuth halide perovskites exhibit more promise in their
future commercialization. In this work, we developed for the first
time photodetectors based on full-inorganic Cs3Bi2I9–xBrx perovskites and modulate their performance by varying x in the composition systematically. Among those self-powered photodetectors,
those based on Cs3Bi2I6Br3 shows the best performance with excellent photosensitivity of 4.1
× 104 at zero bias as well as the responsivity and
detectivity reaching 15 mA/W and 4.6 × 1011 Jones,
respectively. More strikingly, the full-inorganic perovskite photodetectors
exhibit excellent stability in the ambient environment and can maintain
over 96% of the initial value after 100 days owing to the high stability
of the core perovskite film. The paper definitely paves an alternative
and promising strategy for the design of future commercial photodetectors
that are self-powered, stable, nontoxic, etc.
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