Ik Jae Park

We report a highly efficient p–i–n type planar perovskite solar cell with a hybrid PEDOT/NiOx hole-extraction layer. It has been found that the perovskite solar cell with a NiOx thin film as a hole-extraction layer generally exhibits lower fill factor compared to the conventionally used PEDOT:PSS thin film, whereas it shows higher photocurrent and photovoltage. The fill factor of the NiOx-based perovskite solar cell can be significantly improved by treating the NiOx surface with a dilute PEDOT s

We report the electrical properties of rubidium-incorporated methylammonium lead iodide ((Rb_xMA_1-x)PbI₃) films and the photovoltaic performance of (Rb_xMA_1-x)PbI₃ film-based p-i-n-type perovskite solar cells (PSCs). The incorporation of a small amount of Rb⁺ (x = 0.05) increases both the open circuit voltage (V_oc) and the short circuit photocurrent density (J_sc) of the PSCs, leading to an improved p

With photovoltaic performance of metal halide perovskite-based solar cells skyrocketing to approximately 26% and approaching the theoretical Shockley-Queisser limit of single junction solar cells, researchers are now exploring multi-junction tandem solar cells that use perovskite materials to achieve high efficiency next-generation photovoltaics. Various types of bottom subcells, including silicon solar cells used commercially in industry, chalcogenide thin film cells, and perovskite cells, have

Abstract Minimizing optical losses of the incident light at the window layers is one of the effective strategies for high photoresponse to achieve highly efficient perovskite/silicon tandem cells. The enhancement of the photoresponse of monolithic tandem cells via rationally controlling their window layers consisting of C 60 and indium tin oxide (ITO) is reported. The optical simulation and experimental results are consistent that employing thinner C 60 and ITO layers would reduce the optical lo

Highly active, stable, and low-cost oxygen evolution reaction (OER) electrocatalysts are urgently needed for the realization of large-scale industrial hydrogen production via water electrolysis. Layered double hydroxides (LDHs) stand out as one of the most promising nonprecious electrocatalysts worth pursuing. Here, a hierarchical heterogeneous Ni²⁺Fe³⁺@Ni²⁺Fe²⁺ LDH was successfully synthesized via a sequential electrodeposition technique using separat

Water content in an anodic electrolyte affects the crystallization route of anodic TiO₂ nanotube arrays during annealing, which determines the crystallographic orientation of the nanotubes.

Monolithic perovskite/Si tandem solar cells have attracted particular interest because of the potential to achieve high power conversion efficiencies. However, tandem cells require the use of textured Si substrates for efficient light harvesting, and conformal deposition of the perovskite absorption layer on textured Si substrates remains challenging. Here, we introduce a process to prepare a conformal methylammonium lead iodide (MAPbI3) film on the various substrates regardless of their morphol

Monodispersed BaAl2O4:Eu2+ nanospheres with 180 nm size were synthesized through forced hydrolysis using γ-Al2O3 nanospheres as a template followed by a subsequent heat treatment. The incorporation of a barium precursor onto an individual γ-Al2O3 template nanosphere was optimized by controlling the reaction time. The photoluminescence properties of the BaAl2O4:Eu2+ nanospheres were comparable to those of the bulk counterpart prepared at 1300 °C through a conventional solid-state reaction method.

The fluorine substitution strategy, with asymmetric structure and larger dipole moment, enhances charge transport and stabilizes the perovskite/SAM interface. A cost-effective perovskite/PERC tandem solar cell achieved a record efficiency of 30.05%.

We discuss recent advances and outlook for highly efficient perovskite-based triple-junction tandem solar cells.