Integrated and Unassisted Solar Water‐Splitting System by Monolithic Perovskite/Silicon Tandem Solar Cell

Abstract

Photoelectrochemical (PEC) water splitting to hydrogen is a clean process that can achieve green hydrogen. However, the integrated PEC devices have some problems, such as serious incident light loss, poor stability, and high cost. Here, the low‐cost perovskite/silicon tandem cell instead of the costly III−V tandem cell as the light absorber is used, combined with high‐transmittance quartz glass as a protective layer forming an unassisted solar water‐splitting device. Quartz glass can minimize incident light loss and prevent electrolyte corrosion of solar cells. A solar‐to‐hydrogen efficiency of 19.68% is achieved, and the performance can be maintained for 20 h without noticeable change. This structure design provides a novel integrated solar water‐splitting system.

Conductive Passivator for Efficient Monolithic Perovskite/Silicon Tandem Solar Cell on Commercially Textured Silicon

“…Then lead iodide was co-evaporated with halogenated cesium at a rate ratio of 4 Å s −1 :0.4 Å s −1 in the same chamber to form the inorganic precursor (working pressure <5 × 10 −6 mbar). [47] During the above process, the substrate temperature was kept at 30 °C. The thickness of inorganic precursor film before thickening was controlled to be ≈245 and ≈300 nm after thickening.…”

Optimizing Water Oxidation Kinetics by Modulating Spin Alignment through Non-metal Vacancy Engineering

“…The conversion and storage of renewable energy in the form of hydrogen energy is widely regarded as a highly promising solution to address the diffuse and intermittent nature of energy sources, such as solar and wind power . In this context, photovoltaic-assisted electrocatalytic (PV-EC) overall water splitting has gained significant attention. − However, the efficiency of converting solar energy into hydrogen (STH) is still primarily constrained by kinetic losses . These losses stem from intrinsic overpotential and sluggish reaction kinetics of electrocatalysts, particularly in the oxygen evolution reaction (OER) involving a four-electron transfer process. − Drawing from a foundational comprehension of the OER mechanism, the design of novel highly efficient electrocatalysts has been guided by three key principles: e g occupancy, the adsorbate evolution mechanism (AEM), and the lattice oxygen-mediated mechanism (LOM), , and these principles are primarily established in connection with the adsorption energy of reaction intermediates .…”

Amorphous Ni–Fe Phosphide @ 2D WS2 as Bifunctional Electrocatalyst for Unassisted Solar-Driven Overall Water Splitting

“…Hydrogen energy has garnered significant attention with increasing environmental pollution and the energy crisis. Among various hydrogen evolution techniques, solar-driven water splitting involving photovoltaic–electrocatalysis (PV-EC), photoelectrochemical (PEC), and photocatalytic (PC) systems, is one of the most viable routes to achieve renewable, sustainable and green hydrogen energy. − Recently, the PV-EC system, which employs multijunction stacking or serial solar cells, has demonstrated impressive solar to hydrogen (STH) efficiency and practical potential − However, the STH conversion efficiency of PV-EC system is still hampered by the coupling loss and kinetic loss. , Among them, the coupling loss can be mitigated to some extent by optimizing the maximum power point (MPP) of solar cells, which is up to the open-circuit voltage ( V oc ), short-circuit current density ( J sc ), and fill factor (FF) based on solar-cell types . Nevertheless, modifying the MPP for overcoming sluggish kinetics often results in higher V oc , which, in turn, reduces the saturation current density for a given solar cell type, thus impeding high STH efficiency .…”