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.

Nested Inverse Opal Perovskite toward Superior Flexible and Self‐Powered Photodetection Performance

“…For the planar device, the absorption profile exhibits a laminar distribution because of the formation of standing wave. [ 35 ] For the NIO device, the absorption intensity is obviously higher than that of the planar device, and significant light absorption enhancement (red and dark red areas) is observed in the perovskite nanowall layer and the bulk area of the Spiro‐OMeTAD layer. The increased absorption intensity for the NIO device demonstrates improved light trapping effect resulting from the NIO structure.…”

Ordered array structures for efficient perovskite solar cells

“…Unlike the above structures, some other interesting ordered array structures (grating and helices, and so on) are also employed to prepare ETL to improve device performance. 19,74,75,79 For example, Park et al fabricated helical TiO 2 arrays of different radius and pitch by an oblique-angle electron beam evaporation process ( Figure 5C). 74 Although the helical TiO 2 array had longer pathway compared to 1D vertical nanorod array, but it showed higher electron extraction efficiency due to the larger contact area between TiO 2 ETL and perovskite.…”

“…(F) FDTD simulation of the PSCs based on flat TiO 2 and grating TiO 2 under different wavelengths incident light. Source: Reproduced from Reference 75 by permission from Wiley‐VCH…”

“…Unlike the above structures, some other interesting ordered array structures (grating and helices, and so on) are also employed to prepare ETL to improve device performance 19,74,75,79 . For example, Park et al fabricated helical TiO 2 arrays of different radius and pitch by an oblique‐angle electron beam evaporation process (Figure 5C).…”

Soft Lithography for Manufacturing Scalable Perovskite Metasurfaces with Enhanced Emission and Absorption

“…[19,20] Jeong et al fabricated a variety of perovskite micropatterns, [21] Chun et al demonstrated a nanopillar photodetector with enhanced photoresponse [22] and a compact disc grating pattern was used to achieve more efficient and stable solar cells. [23,24] The process of SOMO is depicted in Figure 1a. Generally, the solution is deposited on the substrate to form a not yet crystallized, viscous thin film.…”