Constructing Microcavity for Perovskite Laser Power Converter: A Theoretical Study

Abstract

Laser power converters (LPCs) used in wireless energy transmission can realize noncontact power supply under extreme conditions and provide continuous energy support to unmanned probes, which is believed to play an essential role in the exploration of deep ocean. However, commercially available LPCs usually employ III–V semiconductors as light absorbers due to their industrial maturity. In order to match the underwater 450∼540 nm laser source, it requires an epitaxial growth method to tune the bandgap of those materials, which is highly costly that severely restricts the industrial preparation of LPCs on a large scale. Herein, the potential of perovskite in the application of underwater LPCs is presented theoretically by constructing MAPbBr3 LPC and its theoretical power conversion efficiency (PCE) of 48.55% is demonstrated. Moreover, a microcavity (MC) constructing strategy to further improve the device performance is proposed, in which the transfer matrix method and an admittance‐based antireflection condition approach are combined for the optical simulation. By modulating the MC condition, the significant optical resonance inside the device while avoiding the obvious light reflection is realized. As a result, MC LPCs can obtain a simulated PCE of 64.27%, which is highly competitive with the existing UV–vis LPCs.

Interface Engineering Enhances the Photovoltaic Performance of Wide Bandgap FAPbBr3 Perovskite for Application in Low‐Light Environments

“…And now, we are working on resolving problems, such as simulating underwater solar spectra at various depths, optimizing the thickness of the photoactive layer by performing optical field calculations, underwater packaging, and large‐area fabrication of flexible devices, in order to realize the practical application. [ 53,54 ]…”

High‐Efficiency Wide‐Bandgap Perovskite Solar Cells for Laser Energy Transfer Underwater

“…In laser wireless energy transmission, the max energy conversion efficiency is achieved when the bandgap of photovoltaic material matches the laser photon energy. [ 6 ] Hence, it is essential to further extend the bandgap of WBG perovskite from 1.7 to 2.2 eV to match the laser wavelength. Pure bromide‐base perovskites (e.g., FAPbBr 3 , MAPbBr 3 , CsPbBr 3 ) are primarily under consideration due to their simple structure without phase separation.…”

“…However, the energy-level difference between the charge transport layer and perovskite may result in inefficient interfacial charge extraction, leading to the series carrier accumulation at the interface that impairs the photovoltaic performance. Herein, [6,6]-phenyl C 61 butyric acid methyl ester is introduced between SnO 2 and FAPbBr 3 to alleviate the energy-level mismatch. Significant photoluminescence quenches and decreased series resistance both verify the promoted interfacial charge extraction efficiency.…”