Abstract
Characterization of organic nickel-(II)-tetraphenyl-21H,23H-porphyrin films as a function of substrate type was performed for energy storage applications and consequently environmental enhancement. Nickel-(II)-tetraphenyl-21H,23H-porphyrin films show an amorphous phase. They have a crystallite size of 8–11 nm. Strain caused a shift of different humps’ positions. The measured transmittance has high values within the range of 85–91%, and the absorption coefficient values were included within the high-absorption region. Both optical gap and fundamental gap, refractive index, carrier-concentration-to-effective-mass ratio and lattice dielectric constant were calculated, and they were found to be increased, except refractive index and lattice dielectric constant. The obtained data indicated that nickel-(II)-tetraphenyl-21H,23H-porphyrin films are a candidate for energy storage applications.
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Introduction
Electrical energy has been used in environment, transportation such as planes, ships, fuel cars (Cuce et al. 2016), electrical cars and metro, heating, cooling and freezing of drugs and foods (Said and Hassan 2018), factories, air conditioner, home devices and instruments, different lightening processes, office requirements, laptops, PCs, etc. (Bode et al. 2003; Ratniyomchai and Kulworawanichpong 2017; Zhang et al. 2016).
Energy problems: storage, conversion and saving, have renewed much attention, especially nowadays due to COVID-19 pandemic (Steffen et al. 2020).
Due to COVID-19 pandemic, the demand on energy as well as energy consumption reached maximum because of people health strategies including isolation and quarantine which lead to high electricity consumption in homes, hospitals, medical factories, laboratory researches, etc. So it is necessary to introduce and enhance energy storage, conversion and saving processes to be used at normal or at peak and emergency times (Xu et al. 2019).
Due to the above context, there is a high demand for different energy types and resources which are depleted and/or renewable to enhance energy storage and clean environment (Alptekin et al. 2020). Fuel and/or traditional energy sources cause much environmental pollution, so new researches are needed to focus on clean energy and enhance the energy storage to avoid environmental pollution (Sen et al. 2017; Alptekin et al. 2020) and save emergency energy; in many cases, energy problems occur and emergency resources are needed instantly and immediately at peak consumption at night or day. In fact, the reality says “there is a huge difference between what is available and what is required” (Warren and Becken 2017; Al-Kuhaili 2019). So, there is a bad need for new methods to develop process of energy storage, saving and conversion.
There are many ideas to overcome energy problems (Sugiyama et al. 2016) such as using high-efficiency solar cells, high-capacity batteries or capacitors having long life and steady output (Xu et al. 2019), low-resistive materials, vibration energy–hydraulic energy conversion (He et al. 2020), highly conductive material, sensor control, lighting sources, phase change materials (PCMs), transparent heat mirror (THM) (Al-Kuhaili 2019; Said and Hassan 2018) and high-dielectric materials such as ferroelectric and anti-ferroelectric materials which are good candidates for materials with higher energy storage density (Zhang et al. 2016), widening construction of nearly zero energy building (Favoino et al. 2015) and reduction in greenhouse gas emission (Wengenmayr and Bührke 2013).
Energy storage materials have been widely used, because of their advantages such as having high energy storage density, high efficiency, low energy and absorption loss (Ma et al. 2017; Zhang et al. 2016), high transmittance, optimum band gap and large absorption coefficient of 104 cm−1 in the light visible range for high-efficiency solar cell (Zheng et al. 2018). In case of building energy storage, high-reflectance materials or window glass functional coatings, WGFC can be used as solar control and has low infrared emissivity coatings when climate becomes hot or cold to save energy (Zhang et al. 2018), etc., which consequently leads to more energy storage and energy saving.
Surface, temperature and type of substrate are the most important parameters that can affect the properties and the growth density of thin films in different devices for various industrial applications, especially in energy applications: saving, generation and storage, which finally have a positive effect on environmental enhancement and pollution reduction.
Many types of substrates are available. Solid substrates include conducting and non-conducting substrates (Hasani et al. 2019). Conducting substrates include transparent conducting oxide (TCO) substrates such as indium tin oxides (ITO), fluorine-doped tin oxide (FTO) and zinc oxide (ZnO) and metal substrates such as Ag, Au and Si (Kabir et al. 2019). Non-conducting substrates include amorphous substrate (glass), crystalline substrate (quartz) and flexible substrate (mica). Substrate can be used as a thin-film supporter or as a current collector in different energy applications (Ngamsinlapasathian et al. 2006; Hasani et al. 2019; Kabir et al. 2019).
Porphyrin compounds (PCs) have metal addition flexibility and are considered as a promise candidate for mass energy storage applications such as organic and lithium batteries, high execution energy storage devices, light energy conversion, electrochemical energy storage devices and organic solar cell (Karger et al. 2019; El-Denglawey et al. 2015; Kumar et al. 2017).
Bearing in mind the aforementioned context, nickel-(II)-tetraphenyl-21H,23H-porphyrin (NiTPP) compound has drawn much attention due to its importance and interesting properties and large-scale energy storage applications such as being recycled, environmentally friendly, low-cost budget, high capacity, electronic conjugated system (18 π electrons), high energy density and high conductive energy (Chen et al. 2019; Gao et al. 2017; El-Denglawey 2018; Makhlouf et al. 2014). Other details about advantages and properties of NiTPP are available in El-Denglawey (2018), Makhlouf et al. (2014) and El-Denglawey et al. (2015).
So, the aim of this work is focusing on the effect of substrate type on the spectrometric properties of NiTPP film organic semiconductor material as a good candidate for energy storage applications.
Materials and methods
NiTPP powder with 6 N purity was obtained from Sigma-Aldrich Company and heated in a quartz crucible using a tungsten coil under a vacuum of 10−6 torr and 0.5 nm s−l constant evaporation rate using a vacuum coating unit (Edwards type E306A, England) to prepare 240 nm of NiTPP films on mica, glass and quartz substrates at room temperature and identical condition of time, thickness, crucible holder distance and pressure. From the reusability and durability view point, it is worth to mention that mica, glass and quartz substrates are hard enough and can be recycled or reused. Also, NiTPP films can be solved in DMF and can be redeposited.
Structural properties were characterized by X-ray diffraction technique using an XRD Philips diffractometer (type1710) with CuKα radiation (λ = 1.5406 Å). XRD patterns were run at 40 kV and 30 mA with a scanning speed of 3.761 min−1 at room temperature. Scherrer’s equation is used to calculate the crystallite size of NiTPP films deposited on different substrates according to the following equation (Williamson and Hall 1953; El-Nahass et al. 2016; Dongol et al. 2015; Soliman et al. 2015):
where K is the constant having a value of 1, β represents the peak’s full width half maximum (FWHM) in radians and λ is the wavelength of X-ray (CuKα radiation equal to 1.54056 Å).
Optical properties were studied using spectrometric method; transmittance, T, and reflectance, R, were measured using a computerized Shimadzu UV-2100 double-beam UVVIS scanning spectrophotometer at normal incidence within the wavelength range, λ, of 200–1100 nm of steps 10 nm. Film thickness and evaporation rate were checked by a quartz crystal monitor FTM5 that was attached with the coating unit (El-Denglawey 2018; Dongol et al. 2004, 2016).
Both T and R are used to calculate optical constants and dispersion parameters: absorption coefficient, α, optical gap, \( E_{\text{g}}^{\text{opt}} \), and extinction coefficient, k, according to the following sequences (Tauc 1976; El-Denglawey 2018):
where α can be deduced and used to calculate k:
Finally, \( E_{\text{g}}^{\text{opt}} \) can be calculated according to the Tauc relation (Tauc 1976; El-Denglawey 2018):
where A is the disordered function parameter representing the material’s quality.
where r is the index having different values (1/2, 3/2, 2, 3) and gives details about the available electronic transition, and additional details are available at Tauc (1976) and El-Denglawey et al. (2016).
Here, σmin is the metallic conductivity, c is the light velocity, and ∆Etail = ∆Ec − ∆Ev gives the tailing broadening (El-Denglawey 2018; Tauc 1976).
The obtained data coincide with the indirect transition, r = 2.
Carrier-concentration-to-effective-mass ratio, N/m*, and lattice dielectric constant, εL, can be calculated from the intercept (λ2 = 0) and the slope of the graph according to the following equations (Wemple and DiDomenico 1970; El-Denglawey 2018):
where e represents the traditional elementary charge.
Dispersion energy, Ed, oscillator energy, Eo, and high-frequency dielectric constant, ε∞, can be calculated according to the following equation (Wemple and DiDomenico 1970: El-Denglawey 2011):
Values of Ed can be used to calculate constant β which decides whether the compound is covalent or ionic according to the following equation (Tanaka 1980):
Constant \(\gamma \) has two values: 0.377 ± 0.05 and 0.267 ± 0.04 eV which belong to covalent and ionic compounds, respectively, and Nc, Za and Ne are cation coordination number of nearest neighbor, the anion formal chemical valence and the effective number of the valence electrons per anion, respectively. Dielectric properties were studied using the real, ε1, and imaginary, ε2, parts of the dielectric constant, ε according to the following equations (Wemple and DiDomenico 1970; El-Denglawey 2018):
Results and discussion
Structural properties
The obtained XRD of NiTPP thin films on different substrates shows three humps of different widening and intensities as depicted in Fig. 1a–c. The presence of humps with different FWHMs and intensities gives information about internal structure. It was found that FWHMs decrease when intensities have opposite trend; such issue confirms the well formation of crystallite size with an increase in size (Osuwa and Chigbo 2012); FWHM of hump observed for NiTPP films deposited on mica substrate is the widest, decreases in case of NiTPP films on glass substrate and is the smallest one in case of NiTPP films on quartz substrate, and the similar behavior was observed elsewhere (Hasani et al. 2019).
Higher values of FWHM mean that NiTPP films deposited on mica substrate have a higher disordered structure and more ordered structure in case of films deposited on glass and quartz substrates, respectively. One can observe that hump has different positions (Singh et al. 2014; Hasani et al. 2019). NiTPP films deposited on different substrates show that films have a variety of short-range order (SRO) characterized by a nanoscale crystallite size (Dongol et al. 2016). The calculated crystallite sizes of NiTPP films deposited on mica, glass and quartz substrates are 8, 10 and 11 nm, respectively. The released hump of NiTPP films on different substrates was attributed to amorphous phase because of disorder, while the shift of hump’s position was attributed to microstrain (Singh et al. 2014; Dongol et al. 2016).
Optical properties
Optical characterization of NiTPP was studied by analyzing the features of both T and R as shown in Fig. 2. T of NiTPP films is characterized by high values within the range between 85% for mica substrate and 91% for quartz substrate, and the maximum value of R belongs to NiTPP films on mica substrate.
Two regions are characterizing T curves. The first region at λ = 400–800 nm wavelength corresponds to the absorption region, and α, \( E_{\text{g}}^{\text{opt}} \) and k can be calculated.
The other region at λ > 800 nm wavelength corresponds to the non-absorption region where the NiTPP films are transparent and dispersion parameters such as n, Eo Ed, εL, ε∞ and N/m* can be calculated. At 435 and 500 nm, T shows the two edges which can be attributed to different band gap absorption processes (El-Denglawey 2018).
\( E_{\text{g}}^{\text{opt}} \) can be classified into direct \( E_{\text{gd}}^{\text{opt}} \) and indirect \( E_{\text{gi}}^{\text{opt}} \) and can be calculated according to the available electronic transition (Tauc 1976: El-Denglawey 2018). The calculated values of α are more than 104 (cm)−1 which are included within high-absorption region. Figure 3 shows the (αhν)1/2 versus (hν) of NiTPP films as a function of different substrates. It is obvious that films are characterized by two edges. The first one is \( E_{\text{gi}}^{\text{opt}} \) and the other one represents the fundamental gap, Eg, and the obtained data are summarized in Table 1. NiTPP films deposited on mica substrate have the minimum values of both \( E_{\text{gi}}^{\text{opt}} \) and Eg, and the maximum values are related to NiTPP films on quartz substrate, while NiTPP films on glass substrate have intermediate values, and similar phenomena were seen somewhere (Ma et al. 2017; Hasani et al. 2019). As the deposition process was performed at room temperature and due to the presence of different thermal expansions between different substrates and NiTPP films, the deposited films contain high density of defects which introduce localized states as a tail through band gap (El-Denglawey 2018; Mott and Davis 1971; Tauc 1976), which determines the values of \( E_{\text{gi}}^{\text{opt}} \). So, these explain the presence of amorphous phase of deposited films on different substrates.
Taking into account the obtained values of constant A, the higher the values of A, the lower the values of tails and consequently the higher the values of \( E_{\text{gi}}^{\text{opt}} \), and the obtained values of constant A support the XRD data and \( E_{\text{gi}}^{\text{opt}} \) values (Mott and Davis 1971; El-Denglawey 2018).
Figure 4 shows the spectral dependence of k and n as a function of λ for NiTPP films on quartz substrate. n shows both anomalous dispersion at λ ≤ 800 nm and normal dispersion at λ > 800 nm. k and n dependence shows a behavior similar to T where two edges can be clearly observed at 435 and 500 nm, respectively, which are, as mentioned previously, ascribed to different band gap absorption processes (El-Denglawey 2018; Tauc 1976).
At λ > 800, k decreases with the increase in λ and tends to zero values. This can be ascribed to that the free carriers density at low energies decreases and tends to zero where NiTPP films are transparent at higher wavelength or non-absorbing region because of unavailability of energy to release free electrons for electronic transitions.
To see how N/m* and εL, of NiTPP affected by substrate type, n2 as function of λ2 is figured as shown in Fig. 5 according to (Wemple and DiDomenico 1970; El-Denglawey 2018). Table 1 summarizes the obtained values of n, N/m* and εL.
It can be observed that the slope of the straight line increases and consequently the values of N/m* increase, n and εL decrease from mica to quartz substrate. The decrease in n may attribute to film density change (Bakr et al. 2003). At λ > 800 nm, NiTPP films become transparent and non-absorbing, so single-oscillator model can be used to analyze n (Wemple and DiDomenico 1970; El-Denglawey 2018), and Ed, Eo and ε∞ can be calculated according to the procedure mentioned in El-Denglawey (2011) by plotting (n2(hν) −1)−1 versus (hν)2 of NiTPP films as a function of substrate type using slope and intercept ((hν)2 = 0) in Fig. 6, and the obtained values are included in Table 1. One can recognize that Ed and Eo had a contradicted behavior, and the increase in Eo is related to \( E_{\text{gi}}^{\text{opt}} \) according to Tanaka (1980) and El-Nahass et al. (2005) which depends on localized states, so Eo and \( E_{\text{gi}}^{\text{opt}} \) had a similar behavior.
The calculated value of β (0.379) reveals that NiTPP is a covalent compound as organic semiconductors (Chopra 2013). More information is available in El-Denglawey (2011). Free carrier concentration plays an important role of values of difference in ε∞ and εL (El-Nahass et al. 2005, 2011). Similar behavior was observed in Li et al. (2010) and Rozati et al. (2009).
It was reported that materials with high dielectric properties and low loss factor are preferred for high energy storage density devices, optoelectronic devices and dielectric applications (Zhang et al. 2016; Vidya and Thomas 2018). According to this viewpoint, it is interesting to study dielectric properties of NiTPP films as a function of substrate type. Materials’ electronic structure can be inferred by light reflection, loss and propagation through material. Figures 7 and 8 show ε1 and ε2 of NiTPP films as a function of substrate type. Two edges near both \( E_{\text{gi}}^{\text{opt}} \) and Eg and two dielectric maximums could be observed which inferred the probability of dielectric applications of NiTPP films. According to Zhang et al. (2016), the released maximums of ε1 and ε2 within the energy range of 2.5–3.5 eV as depicted in Figs. 7 and 8 show the energy storage region where energy can be stored. Such issue gives a spotlight of energy storage applications of NiTPP films. Values of ε1 and ε2 were obtained at hν = 2.9 eV and are depicted in Fig. 9 and included in Table 1, and it increases with the following sequences: mica < glass < quartz and consequently the energy storage increases as well.
Conclusion
This article focuses on the properties of NiTPP films, it is affected by different substrate types for energy storage applications. NiTPP films were deposited on mica, glass and quartz substrates by thermal evaporation technique. Structural properties show that all films have nanostructure property with the crystallite sizes of 8, 10 and 11 nm for mica, glass and quartz, respectively, which confirm the structural enhancement and more ordering in the mentioned sequence of substrates. High values of transmission were obtained as well as high absorption coefficient, two gaps, namely optical and fundamental gaps, were calculated for NiTPP films on mica, glass and quartz substrates, and the highest values were obtained for NiTPP films on quartz substrates which are 91%, 2 × 106 (cm−1), 2.07 and 2.63 eV, respectively. The dependence of ε1 and ε2 on photon energy as a function of substrate type shows energy storage regions increase in mica, glass and quartz sequence. The dependence of NiTPP films on substrate type gives high values of T, α, \( E_{\text{gin}}^{\text{opt}} \), \( E_{\text{g}}^{\text{opt}} \) and the two maximums of ε1 and ε2 within the energy range of 2.5–3.5 eV which are used for energy storage applications.
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This work was supported by the vice presidency of Graduate Studies and Academic Research (Taif University, KSA), Research Group ID: 1-440-6142. It is gratefully acknowledged.
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El-Denglawey, A., Alburaih, H.A., Mostafa, M.M. et al. Dependence of new environmental nano organic semiconductor nickel-(II)-tetraphenyl-21H,23H-porphyrin films on substrate type for energy storage applications. Int. J. Environ. Sci. Technol. 18, 393–400 (2021). https://doi.org/10.1007/s13762-020-02829-3
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DOI: https://doi.org/10.1007/s13762-020-02829-3