Ultrahigh-Responsivity Photodetectors from Perovskite Nanowire Arrays for Sequentially Tunable Spectral Measurement

Compared with
polycrystalline films, single-crystalline methylammonium lead halide
(MAPbX3, X = halogen) perovskite nanowires (NWs) with well-defined
structure possess superior optoelectronic properties for optoelectronic
applications. However, most of the prepared perovskite NWs exhibit
properties below expectations due to poor crystalline quality and
rough surfaces. It also remains a challenge to achieve aligned growth
of single-crystalline perovskite NWs for integrated device applications.
Here, we report a facile fluid-guided antisolvent vapor-assisted crystallization
(FGAVC) method for large-scale fabrication of high-quality single-crystalline
MAPb­(I1–xBrx)3 (x = 0, 0.1, 0.2, 0.3, 0.4)
NW arrays. The resultant perovskite NWs showed smooth surfaces due
to slow crystallization process and moisture-isolated growth environment.
Significantly, photodetectors made from the NW arrays exhibited outstanding
performance in respect of ultrahigh responsivity of 12 500
A W–1, broad linear dynamic rang (LDR) of 150 dB,
and robust stability. The responsivity represents the best value ever
reported for perovskite-based photodetectors. Moreover, the spectral
response of the MAPb­(I1–xBrx)3 NW arrays could be sequentially
tuned by varying the content of x = 0–0.4.
On the basis of this feature, the NW arrays were monolithically integrated
to form a unique system for directly measuring light wavelength. Our
work would open a new avenue for the fabrication of high-performance,
integrated optoelectronic devices from the perovskite NW arrays.