Nanoimprinted Grating‐Embedded Perovskite Solar Cells with Improved Light Management

Abstract

Organic-inorganic halide perovskite solar cells are one of the most efficient photovoltaic devices, and their power conversion efficiency (PCE) continues to grow rapidly due to the optimization of device architecture and functional materials. The involved optical design has an important impact on performance by affecting the light harvesting capability. Here, demonstrated is a simple and effective strategy to boost device performance from the perspective of light management. A diffraction grating pattern into the TiO 2 scaffold and antireflection layer is simultaneously introduced to construct a double grating design for perovskite solar cells. The grating pattern obtained using a commercial compact disk as the hard mold can modulate light transport by enhancing the light transmittance and, thus, light absorption in perovskite solar cells. The grating pattern-induced light trapping can significantly increase the short-circuit current density and PCE by 4.8% and 7.9%, respectively, on average. The present work develops a feasible method by tailoring the morphology-related optical property to further improve the performance of perovskite solar cells. The double grating design can also generate structural color and can provide an alternative solution for fabricating colorful solar cells.

High‐Performance Near‐Infrared Photodetector Enabled by Tin‐Based Perovskite Inverse Opal Towards Secure Information Transmission

“…The simulation geometry was constructed based on the cross‐sectional SEM images of the fabricated devices. The calculated absorption profile in the x‐z plane under 808 nm plane‐wave illumination (incident along the z‐axis) reveals a stark contrast: the planar device (left) exhibits a modulated absorption pattern due to standing‐wave interference [25]. Whereas the IO device (right) shows a substantially stronger and more uniformly distributed absorption, extending throughout the perovskite skeleton and deep into the hole transport layer (HTL) region.…”

Single-Layer ZnO Hollow Hemispheres Enable High-Performance Self-Powered Perovskite Photodetector for Optical Communication

“…The 3D FDTD simulation results of the light absorption distribution are shown in Fig. 3 a and S6, S7, which displays that the light absorption of the planar device exhibits a laminar distribution because of the formation of standing wave [ 45 ]. The strongest light absorption (dark red part) is located at the ZnO/FTO interface, which means great waste of light utilization.…”

Optimizing Vertical Crystallization for Efficient Perovskite Solar Cells by Buried Composite Layers

“…We speculate that the enhanced transmittance derives from the adjustment of incident lights by the evenly distributed g‐C 3 N 4 nanostructures or the possible optical coupling in the SnO 2 :g‐CN layer. [ 30–32 ] Furthermore, we measured the electrical conductivity of the BCLs, which is critical for electron transport at the buried interface (Figure 1f). The direct current conductivity ( σ 0 ) is extracted from the equation, J = σ 0 Ad −1 V , where d is the thickness of the BCL and A is the active area.…”