Herein, zinc phthalocyanine (ZnPc) layers are used as an active material to fabricated radiowave/microwave band filters. The thin layers of ZnPc are coated onto Au and Mn thin‐film substrates to form ohmic and Schottky interfaces, respectively. The Au/ZnPc and Mn/ZnPc devices are structurally and electrically characterized by means of X‐ray diffraction and impedance spectroscopy techniques in the frequency domain of 0.01–1.80 GHz, respectively. The structural investigations show that both interfaces exhibit strained structures of the monoclinic phase of ZnPc. It is also observed that while the Au/ZnPc/Ag devices display negative capacitance (NC) effects in the microwave region above 1.46 GHz, the Mn/ZnPc/Ag devices show resonance–antiresonance capacitive response in the radiowave region accompanied with NC effects in the range of 0.06–1.80 GHz. In addition, analyses of the reflection coefficient spectra have shown the ability of the (Mn, Au)/ZnPc/Ag interfaces to behave as a typical high‐/low‐bandpass filters. The filters can be operated in microwaves and radiowave ranges. The return loss spectral investigations on these filters have shown their ability to reach the market standards.

In this work, the optical dynamics and the structural properties of the zinc phthalocyanine which are coated onto 150 nm thick Au substrates are studied by the X-ray diffraction and optical spectrophotometry techniques. The Au/ZnPc interfaces appears to be strongly affected by the large lattice mismatches at the interface. It is observed that the coating ZnPc onto Au substrates increases the light absorbability by 4.7 and 128.2 times in the visible and infrared regions of light, respectively. Au substrates activated the free carrier absorption mechanism in the ZnPc thin films in the infrared range of light. In addition, the transparent Au substrates forced narrowing the energy band gap in both of the Q and B bands. It also increased the dielectric constant value by ~3.5 times in the IR range. The enhancements in the optical properties of ZnPc that resulted from the thin Au substrates make the ZnPc more suitable for optoelectronic, nonlinear optical applications and for electromagnetic energy storage in the infrared range of light.

Herein, the effects of manganese transparent (150 nm) substrates on the structural, nonlinear optical, and dielectric properties of zinc phthalocyanine are explored. ZnPc thin films are observed to exhibit deformed crystal structure associated with remarkable enhancement in the light absorbability by 21 times at 2.62 eV and by 173 times in the near‐infrared (NIR) region of light upon replacement of glass by transparent Mn substrates. The Mn layer also causes a redshift in the energy bandgap, allows generation of free carrier absorption process and increases the dielectric constant by more than 169% in the NIR region. The interaction between the manganese substrates with the organic ZnPc thin layers decreases the free holes density, widens the plasmon frequency range, and improves the drift mobility of holes. The nonlinear dielectric response with the highly improved light absorbability in the NIR range of light nominates the Mn/ZnPc thin films for optoelectronic applications.