Artificial structural colors arising from nanosized materials have drawn much attention because of ultrahigh resolution, durability, and versatile utilizations compared to conventional pigments and dyes. However, the limited color range with current approaches has interrupted the supply for upcoming structural colorimetric applications.Here, we suggest a strategy for the widening of the color gamut by linear combination of two different resonance modes originating from silicon nanowire arrays (Si NWAs) and metal−insulator−metal nanoresonators. The enlarged color gamut representations are simply demonstrated by transferring Si NWAs embedded in a flexible polymer layer without additional treatment/fabrication. Optical simulation is used to verify the additive creation of a new resonance dip, without disturbing the original mode, and provides "predictable" color reproduction. Furthermore, we prove that the proposed structures are applicable to well-known semiconductor materials for various flexible optical devices and other colorant applications.
Solar-driven PEC cell is a promising approach to obtain hydrogen with near-zero carbon emission pathway. In this article, PEC cell was reviewed as per growth/synthesis methods. This review provides an overview and a guide for research on PEC cell.
A huge concern on global climate/energy crises has triggered intense development of radiative coolers (RCs), which are promising green‐cooling technologies. The continuous efforts on RCs have fast‐tracked notable energy‐savings by minimizing solar absorption and maximizing thermal emission. Recently, in addition to spectral optimization, ceramic‐based thermally insulative RCs are reported to improve thermoregulation by suppressing heat gain from the surroundings. However, a high temperature co‐firing process of ceramic‐based thick film inevitably results in a large mismatch of structural parameters between designed and fabricated components, thereby breaking spectral optimization. Here, this article proposes a scalable, non‐shrinkable, patternable, and thermally insulative ceramic RC (SNPT‐RC) using a roll‐to‐roll process, which can fill a vital niche in the field of radiative cooling. A stand‐alone SNPT‐RC exhibits excellent thermal insulation (≈0.251 W m−1 K−1) with flame‐resistivity and high solar reflectance/long‐wave emissivity (≈96% and 92%, respectively). Alternate stacks of intermediate porous alumina/borosilicate (Al2O3‐BS) layers not only result in outstanding thermal and spectral characteristics, causing excellent sub‐ambient cooling (i.e., 7.05 °C cooling), but also non‐shrinkable feature. Moreover, a perforated SNPT‐RC demonstrates its versatility as a breathable radiative cooling shade and as a semi‐transparent window, making it a highly promising technology for practical deployment in energy‐saving architecture.
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