Stretchable Perovskite Optoelectronics: Overcoming Limitations via Material and Geometric Approaches

ABSTRACT Advancing free‐form‐factor electronics is essential to broaden their applicability of electronics. In this regard, the development of stretchable semiconductors and their systems that offer both excellent stretchability with outstanding optoelectronic properties is imperative. Among various optoelectronic material candidates, metal‐halide perovskite has emerged as the most promising semiconductors owing to their high charge mobility, long exciton diffusion length and tunable bandgap. However, compared to stretchable organic‐based devices, stretchable perovskite devices have been rarely investigated because of perovskites’ inherently low mechanical stretchability. In this regard, to develop stretchable perovskite optoelectronics, identifying the fundamental determinants of their low mechanical deformability and establishing of strategies to overcome these limitations are crucial. In this context, this paper presents the first in‐depth overview of stretchability characteristics of perovskite‐based optoelectronic device, highlighting key strategies for realizing next‐generation stretchable platforms from material and geometric perspectives. In detail, background on mechanical deformation behaviors of stretchable devices is provided. Subsequently, we examine reported studies on stretchable perovskite optoelectronic devices according to their materials and device structures. Finally, current challenges and important issues that remain unresolved but must be addressed to enable meaningful progress are discussed.