Enhanced Photovoltaic Performance of Inverted Perovskite Solar Cells through Surface Modification of a NiO-Based Hole-Transporting Layer with Quaternary Ammonium Halide-Containing Cellulose Derivatives.

In this study, we positioned three quaternary ammonium halide-containing cellulose derivatives (PQF, PQCl, PQBr) as interfacial modification layers between the nickel oxide (NiO) and methylammonium lead iodide (MAPbI) layers of inverted perovskite solar cells (PVSCs). Inserting PQCl between the NiO and MAPbI layers improved the interfacial contact, promoted the crystal growth, and passivated the interface and crystal defects, thereby resulting in MAPbI layers having larger crystal grains, better crystal quality, and lower surface roughness. Accordingly, the photovoltaic (PV) properties of PVSCs fabricated with PQCl-modified NiO layers were improved when compared with those of the pristine sample.

Pain Control on Demand Based on Pulsed Radio-Frequency Stimulation of the Dorsal Root Ganglion Using a Batteryless Implantable CMOS SoC.

This paper presents the implementation of a batteryless CMOS SoC with low voltage pulsed radio-frequency (PRF) stimulation. This implantable SoC uses 402 MHz command signals following the medical implanted communication system (MICS) standard and a low frequency (1 MHz) for RF power transmission. A body floating type rectifier achieves 84% voltage conversion ratio.