Strain Effects on Flexible Perovskite Solar Cells

Abstract

Flexible perovskite solar cells (f‐PSCs) as a promising power source have grabbed surging attention from academia and industry specialists by integrating with different wearable and portable electronics. With the development of low‐temperature solution preparation technology and the application of different engineering strategies, the power conversion efficiency of f‐PSCs has approached 24%. Due to the inherent properties and application scenarios of f‐PSCs, the study of strain in these devices is recognized as one of the key factors in obtaining ideal devices and promoting commercialization. The strains mainly from the change of bond and lattice volume can promote phase transformation, induce decomposition of perovskite film, decrease mechanical stability, etc. However, the effect of strain on the performance of f‐PSCs has not been systematically summarized yet. Herein, the sources of strain, evaluation methods, impacts on f‐PSCs, and the engineering strategies to modulate strain are summarized. Furthermore, the problems and future challenges in this regard are raised, and solutions and outlooks are offered. This review is dedicated to summarizing and enhancing the research into the strain of f‐PSCs to provide some new insights that can further improve the optoelectronic performance and stability of flexible devices.

One-Stone-for-Two-Birds Method to Improve the SnO2 Layers for High Power-per-Weight Flexible Perovskite Solar Cell Mini-modules

“…However, the PCE of the control one decreases to 40.1% of the initial PCE. The improved stability would be attributed to the relaxed strain at the PAAm-modified SnO 2 /perovskite in Figure and the improved buried surface of the perovskite film. , …”

“…The improved stability would be attributed to the relaxed strain at the PAAm-modified SnO 2 /perovskite in Figure 5 and the improved buried surface of the perovskite film. 52,53 Thanks to the addition of PAAm, the stability of fPSCs has been fully improved. Thus, we considered to try the strategy for large-area fPSCs.…”

Cross‐Linkable Fullerene Enables Elastic and Conductive Grain Boundaries for Efficient and Wearable Tin‐Based Perovskite Solar Cells

“…Tin‐based perovskite with ideal band gap and eco‐friendly properties is the most promising alternative material for lead perovskite [6–10] . Moreover, tin‐based perovskite has better mechanical properties than lead‐based perovskite, [11–14] which exhibits great potential in high‐performance wearable applications [15,16] . In recent years, extensive efforts have been made to improve the efficiency of tin‐based perovskite solar cells (TPSCs).…”

Cross‐Linkable Fullerene Enables Elastic and Conductive Grain Boundaries for Efficient and Wearable Tin‐Based Perovskite Solar Cells

“…[2][3][4][5] Tin-based perovskite with ideal band gap and eco-friendly properties is the most promising alternative material for lead perovskite. [6][7][8][9][10] Moreover, tinbased perovskite has better mechanical properties than leadbased perovskite, [11][12][13][14] which exhibits great potential in highperformance wearable applications. [15,16] In recent years, extensive efforts have been made to improve the efficiency of tin-based perovskite solar cells (TPSCs).…”