Metallic glasses are alloys without long-range atomic arrangement, obtained from the atomic structure of its liquid state. The solid metallic glass is fabricated by rapidly quenching the liquid-state alloy, which allows it to circumvent crystal growth prior to solidification. The unique, metallic and amorphous properties of metallic glasses have opened up possibilities for various applications, for they exhibit superior mechanical and chemical stability than that of the conventional crystalline metals. In this research, metallic glass thin film sputtered onto polymeric film exhibited encouraging results in mechanical reversibility through bending tests. Subsequently, suitable sheet resistance and work functions for applications photovoltaic cells were attained through compositional tuning, which enabled fabrication of an electrode for OPV, with enhanced chemical stability than that of crystalline metal.
In this research, we focus on the PEDOT:PSS materials, which is widely utilized in the field of organic electronics. First, we applied customized transfer of PEDOT:PSS to inter-layer in planer-type perovskite photovoltaics. The transfer-printed PEDOT:PSS layer led to the favorable crystallinity of perovskite Especially, the better stability resulted from the preserved crystallinity, and the inhibition of the ITO degradation. Second, we fabricated a pH-controlled PEDOT:PSS adjusted by imidazole. The neutral PEDOT:PSS revealed superior and very consistent performance for various active area sizes due to the uniformity of the perovskite crystals. The stability also was enhanced by preventing degradation by strong acid. Finally, a hybrid of PEDOT:PSS and copper chalcogenide nanoparticles (NPs) was used for organic photodiode. Since the NPs formed energy barrier in PEDOT:PSS, the dark current of the device was remarkably suppressed, with excellent detectivity.
In this study, we developed a effective processing protocol to modify the electrical conductivity of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films via post-treatment with an alcohol-based solvent, 2-chloroethanol (2-CE), and to improve their performance as a transparent anode in organic photovoltaics (OPVs). Due to its appropriate boiling point, 2-CE is advantageous both for treating as a liquid phase chemical and for drying from the films via evaporation. We compared the optical and electrical properties of the 2-CE-treated PEDOT:PSS with those of standard 5 vol% dimethyl sulfoxide (DMSO) added PEDOT:PSS. With a similar thickness and transmittance in the visible region, the 2-CE-treated polymer electrodes surpassed the DMSO-added films with regard to the electrical conductivity. Additionally, we conducted X-ray Photoelectron Spectrometer (XPS), Ultraviolet Photoelectron Spectroscopy (UPS), J-V characteristic, Photoluminescence (PL), Impedance spectroscopy.
Currently, perovskite containing organometal halides have issues for limited color range and low photoluminescence (PL). In this regard, we designed split-ligand mediated re-precipitation (Split-LMRP) as a unique synthesis method for improved stability and PL by separating octylamine and oleic acid (OA), compared to a conventional method. [Accepted manuscript] Octylamine adjusted the size of the nucleus as main ligand, while OA acted only as a stabilizer. Especially, the QDs based on Split-LMRP remained PL intensity after 5 days with strong PL emission and a high PL quantum yield (PLQY) of 91.5% due to the removal of most polar solvents during re-precipitation. In addition, the size of the QDs was adjusted constantly in the range of 2-5 nm depending on the concentration of octylamine. When the perovskite QDs were used as the intermediate layer of the perovskite solar cell, performance and reproducibility of the PSC were improved by forming stable phases.
Porous organic polymers (POP) materials are two and three-dimensional structures formed through covalent bonds and lead to effective charge extraction through large contact areas [1,2]. In this study, by adjusting the synthetic strategy for porous organic polymers (T-POP), soluble, hypertonic and crosslinked polymers with alkyl-modified perylene motifs were produced [3]. As the surface area of this polymer expands, the frequency of contact of molecules between optically active units, such as the perylene motifs of the framework, increases, and π-π stacking becomes stronger. Facilitated charge carrier transport in inverted perovskite solar cells. The T-POP interlayer improves the morphology of the surface on the PC70BM layer to induce smooth current flow and builds an electron carrier pathway by stacking a three-dimensional vertical structure. As a result, the stability of the device was increased by T-POP, and the power conversion efficiency of the applied device was increased by 13%.
Although many efforts have been made to achieve a uniform perovskite film, the use of CH3NH3I:PbI2:DMSO (1:1:1) has been limited. This is because the intermediate phase and crystal phase can coexist in the precursor solution.[1] To solve this, a complex process was inevitably needed to ensure the uniformity.[2] Here, the quality of CH3NH3PbI3 film is simply improved via controlling nonstoichiometric molar ratio.[3] The uniform and dense perovskite layer was successfully fabricated by controlling the perovskite adduct formation. This demonstrated a critical point to improve current density and power conversion efficiency in perovskite photovoltaics. The synergistic effect of morphology and electrical properties has proved the optimized solubility for generating high current densities in inverted perovskite solar cells
[1] L. Xie et al., Phys. Chem. Chem. Phys., 2017, 19, 1143
[2] K. Fu et al., Nanoscale, 2016, 8 4181
[3] B. G. Kim et al., Sol. Energy Mater. Sol. Cells, 2019, 192, 24
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.