Effect of Substrate on the Photodetection Characteristics of ZnO-PAni Composites

Abstract

Heterojunction photodiodes involving a wide bandgap semiconductor on polymeric substrates have a number of potential advantages such as excellent blue response, simple processing steps, and low processing cost. We report on the chemical synthesis of ZnO–polyaniline (PAni) composite thin films and their use for UV detection. The morphological and structural properties of the composites were characterized using X-ray diffraction (XRD), Raman spectroscopy, and field-emission scanning electron microscopy (FESEM). The XRD results demonstrated the formation of hexagonal wurtzite ZnO structure, with no noticeable change upon the addition of PAni. The FESEM images revealed the hexagonal microstructure of the ZnO-PAni composite films, with high porosity. Raman spectroscopy revealed the interfacial interaction between ZnO and PAni. Thin films deposited on glass, PET, and Si substrates were used to fabricate photodetector devices based on the ZnO-PAni composites. The photodetector made using Si substrate showed the best performance with a high gain of 108, sensitivity of 9842, and responsivity of 0.707A/W.

ZnS Nanosheets in a Polyaniline Matrix as Metallopolymer Nanohybrids for Flexible and Biofriendly Photodetectors

“…ZnS is a wide band gap material that possesses two different types of structures, zinc blende and wurtzite, and both exhibited a band gap of >3 eV . Among many conducting polymers, polyaniline is the most studied conducting polymer, which shows the significant conduction of electricity in the favorable oxidation state-desired pH level. , Due to their double bond in the backbone of the conducting polymer, they can conduct electricity. Polyaniline with its emeraldine form exhibits its p-type behavior and possesses a wide band gap, but the conductivity of this polyaniline largely depends on the synthesis route .…”

Regulation of Charge Carrier Dynamics in ZnO Microarchitecture‐Based UV/Visible Photodetector via Photonic‐Strain Induced Effects

“…Till now, sodium (Na), gallium (Ga), cadmium (Cd), lithium (Li), cobalt (Co), and gold (Au) elements were substituted into ZnO to improve the photonic properties. Similarly, many organic polymers along with ZnO structure were investigated such as poly(3,4‐ethyleneioxythiophene):polystyrenesulfonate, poly(3hexylthiophene) (P3HT), polyaniline, and poly[2‐methoxy‐5‐(2‐ethylhexyloxy)‐1,4‐phenylenevinylene] to enhance the photosensitivity. Other than these approaches, the ZnO PDs response can be improved or tuned by the strain induced behaviors in balancing the electronic transportations via piezotronic and piezo‐phototronic effects toward the realization of flexible and rollable optoelectronic sensing systems .…”

Effect of Substrates on Structural, Morphological, Optical and Electrical Characteristics on Poly (9,9-di-n-octylfluorenyl-2,7-diyl) (PFO) Thin Films

“…The silicon n-type substrates have a smoother surface with very small roughness (RMS) values that promote better surface contact between silicon n-type substrate and PFO thin films and can be linked to high surface adhesion between the PFO and Si n-type substrate. 29 Since ITO and FTO are coated on glass, there is some amorphous content as shown in the XRD pattern. This results in larger thermal and lattice mismatching with PFO compared with silicon n-type substrates.…”