Inorganic–Organic p‑n Heterojunction
Nanotree Arrays for a High-Sensitivity Diode Humidity Sensor
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Abstract
Large-area
and ordered arrays (16 cm<sup>2</sup>) of an inorganic–organic
p-n heterojunction nanotree (NT) were successfully fabricated. The
nanotree arrays consist of ZnO nanorods (NRs) as backbones and CuTCNQ
(TCNQ = 7,7,8,8-tetracyanoquinodimethane) NRs as branches. The sizes
of CuTCNQ NRs can be tuned by the thickness of the Cu layer deposited
on the surface of ZnO NR. The CuTCNQ/ZnO NT arrays displayed excellent
diode nature and obvious size-dependent rectification ratios were
observed. Moreover, the CuTCNQ/ZnO NT arrays were first applied for
the fabrication of a diode-type humidity sensor, which displayed ultrahigh
sensitivity and quick response/recovery properties at room temperature.
The detection limitation of this new diode-type humidity sensor lowers
to 5% relative humidity (RH)