Heterojunctions Based on 2D Materials for Pulse Laser Applications.

In recent years, heterostructures composed of two-dimensional (2D) materials have demonstrated broad application prospects across various domains, primarily attributed to their exceptional electrical and optical properties. The superior performance of these heterostructures is rooted in the interlayer interactions and the diversity of the constituent materials. Notably, their applications have been greatly advanced in optical fields such as photodetectors, lasers, modulators, optical sensors, and nonlinear optics.

High-Quality (CHNH)BiI Film-Based Solar Cells: Pushing Efficiency up to 1.64.

Bismuth-based solar cells have exhibited some advantages over lead perovskite solar cells for nontoxicity and superior stability, which are currently two main concerns in the photovoltaic community. As for the perovskite-related compound (CHNH)BiI applied for solar cells, the conversion efficiency is severely restricted by the unsatisfactory photoactive film quality. Herein we report a novel two-step approach- high-vacuum BiI deposition and low-vacuum homogeneous transformation of BiI to (CHNH)BiI-for highly compact, pinhole-free, large-grained films, which are characterized with absorption coefficient, trap density of states, and charge diffusion length comparable to those of some lead perovskite analogues.

Effect of Morphology Control of Light Absorbing Layer on CH3NH3PbI3 Perovskite Solar Cells.

As one of the most significant components of perovskite solar cells, the perovskite light absorbing layer demands high quality to guarantee extraordinary power conversion efficiency (PCE). We have fabricated series of CH3NH3PbI3 perovskite solar cells by virtue of gas-flowing assisting (GFA), spin coating twice for the Pbl2 layer and dipping the semi-samples in a thermal CH3NH3I solution, by which some undesirable perovskite morphologies can be effectively avoided. The modified conductions have also dramatically improved the perovskite layer and elevated the coverage ratio from 53.