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Direct Solar Hydrogen Generation at 20% Efficiency Using Low‐Cost Materials

Direct solar hydrogen generation using a perovskite/Si tandem photovoltaic (PV) cell and Ni-based earth-abundant electrocatalysts achieves a record solar-to-hydrogen efficiency of 20%. The combination of the innovative “flower-stem” morphology of the NiMo catalyst, improves perovskite cell performance passivated by large organic cations and closed current...

Fiber‐Shaped Electronic Devices

The next generation of electronic devices such as modern communication and healthcare systems and wearable electronics require omnidirectional flexibility, and must be super lightweight, and bendable. Fiber- and wire-shaped devices with a typical thickness of several tens of micrometers offer incredible opportunities and have been widely investigated...

Co‐Evaporated Formamidinium Lead Iodide Based Perovskites with 1000 h Constant Stability for Fully Textured Monolithic Perovskite/Silicon Tandem Solar Cells

Co-evaporation methylammonium formamidinium lead iodide perovskites are investigated and different aspects of stability are addressed. The influence of the perovskite composition on the performance and the long-term stability of the resulting solar cells is studied. Monolithic fully textured perovskite/silicon tandem solar cells with co-evaporated perovskite...

Leading Future Technologies of Energy and Material Science at the College of Engineering, Korea University

Comparing and Quantifying Indoor Performance of Organic Solar Cells

Although organic photovoltaics have been established to be a promising candidate for indoor light recycling, standardized testing conditions to quantify their performance are still lacking. Therefore, a method to calculate the efficiency of solar cells on the basis of relative emission spectra, quantum efficiency and current-density-voltage measurements,...

Nanoporous Iridium Nanosheets for Polymer Electrolyte Membrane Electrolysis

Nanoporous Ir nanosheets (npIr x -NS) are a unique anode catalyst combining high surface-to-volume and interconnected metallic backbone to yield enhanced mass activities and reduced ohmic losses in water electrolyzers. The utility of npIr x -NS is demonstrated by enhanced performance at low loadings while exhibiting negligible loss in performance...

A Thiadiazole‐Based Conjugated Polymer with Ultradeep HOMO Level and Strong Electroluminescence Enables 18.6% Efficiency in Organic Solar Cell

A thiadiazole-based polymer donor (PB2F) with an ultradeep highest occupied molecular orbital level and high electroluminescence is reported. In organic solar cell (OSC) devices, PB2F exhibits a power conversion efficiency (PCE) of 14.5% after blending with IT-4F, one of highest values among the IT-4F-based OSCs, and an outstanding PCE of 18.6% in the...

Universal Current Losses in Perovskite Solar Cells Due to Mobile Ions

Current losses in perovskite solar cells (PSCs) are investigated using transient photoluminescence and charge extraction measurements. Mobile ions cause a substantial current and efficiency loss by accumulating at the perovskite/transport layer interfaces, which screens the internal electric field. This work elucidates the detrimental impact of mobile...

Materials Beyond Conventional Triboelectric Series for Fabrication and Applications of Triboelectric Nanogenerators

The development of materials for active triboelectric layers, electrodes, and their applications are systematically reviewed. The review focusses on the materials beyond the conventional triboelectric series, dominated by the polymers and a few metals. This review also outlines the challenges and future perspectives on the development of materials for...

A Review on Emerging Barrier Materials and Encapsulation Strategies for Flexible Perovskite and Organic Photovoltaics

Next-generation flexible solar cells have recently undergone rapid development with a promising outlook for high performance and mass-producibility. Protecting these devices from moisture and oxygen by effective encapsulation is essential to achieve the required operational lifetimes for commercialization. This article reviews flexible barrier materials...

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