Methylammonium
lead bromide is a very perspective hybrid semiconductor
material, suitable for high-sensitive, filter-free photodetection
of electromagnetic radiation. Herein, we studied the effect of electrode
spacing on the output performance and stability of planar-type photodetectors
based on high-quality MAPbBr3 single crystals. Such crystals,
as large as 4.5×4.5×1.2 mm3 were synthesized
via the inverse temperature crystallization method and were further
used for the fabrication of planar Au/MAPbBr3/Au photodetectors
with variable electrode spacing (in the range between 125 and 25 μm).
We report that the electrode spacing has a profound impact on photocurrent
densities and key detector parameters (responsivity R, external quantum efficiency EQE, and specific
detectivity D*). In the studied fivefold electrode
spacing, the photocurrent density increased over 4 times, with decreasing
active area of the devices. This effect is attributed to intrinsic
photocurrent amplification. Based on the transient photocurrent measurements
and calculated key parameters, we determined the device sample with
the best output performance. The champion sample with an electrode
spacing of 50 μm exhibited great detection ability, especially
for a low light intensity of 200 nWcm–2, for which
we calculated the R of 19.55 A W–1, EQE of 4253%, and D* of 3.42
× 1012 Jones (cm Hz1/2 W–1). Moreover, the functional stability of this device showed a minimal
reduction of photodetection ability after 2000 cycles, which makes
it very promising for the next generation of optoelectronic devices.
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