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.
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.
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
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