Metal halide perovskites (MHPs) are thought to be among the most promising materials for smart electronic textiles because of their unique optical and electrical characteristics. Recently, wearable perovskite devices have been developed that combine the excellent properties of perovskite with those of textiles, such as flexibility, light weight, and facile processability. In this review, advancements in wearable perovskite devices (e.g., solar cells, photodetectors, and light-emitting diodes) concerning their device architectures, working mechanisms, and fabrication techniques have been discussed. This study also highlights the technical benefits of integrating MHPs into wearable devices. Moreover, the application challenges faced by wearable perovskite optoelectronic devices—from single devices to roll-to-roll manufacturing, stability and storage, and biosafety—are briefly discussed. Finally, future perspectives on using perovskites for other wearable optoelectronic devices are stated.

Formamidinium lead bromide (FAPbBr₃) nanocrystals have emerged as a powerful platform for optoelectronic applications due to their pure green photoluminescence (PL). However, their low colloidal stability under storage and operation reduces the potential use of FAPbBr₃ perovskite nanocrystals (PeNCs) in various applications. In this study, we prepared the poly(L–lactic acid) (PLLA) nanofibrous membrane embedded with FAPbBr₃ perovskite nanocrystals by electrospinning the perovskite and PLLA precursor solution. This is a simple and low-cost technique for the direct confinement of nano-sized functional materials in the continuous polymer nanofibres. PLLA as a polymer matrix provided a high surface framework to fully encapsulate the perovskite NCs. In addition, we found that FAPbBr₃ PeNCs crystallize spontaneously inside the PLLA nanofibre. The resultant PLLA-FAPbBr₃ nanofibrous membranes were stable and remained in the water for about 45 days without any evident decomposition. The results of this research support the idea of new possibilities for the production of air-stable FAPbBr₃ PeNCs by forming a composite with PLLA polymer. The authors believe this study is a new milestone in the development of highly stable metal halide perovskite-based nanofibres, which allow for potential use in lasers, waveguides, and flexible energy harvesters.

Halide perovskite nanocrystals (PeNCs) have emerged as a class of excellent semiconductors in the past few years for their high-performance optoelectronic applications. These materials have received considerable attention due to efficient charge carrier mobility, high photoluminescence quantum yields (PLQYs) and near theoretical efficiencies for green emitters. However, methylammonium (MA) cation-based perovskites exhibit their inherent instability such as high sensitivity to light, heat, oxygen, and moisture which influence their performance in practical applications. Their low in production cost and ease of synthesis make them suitable candidate for upcoming technologies. In this research, we study the doping of Cs and Rb cations into MAPbBr3 PeNCs to optimize their morphology, crystal structure, and optical properties. It is found that rubidium cations doping can greatly enhance the photoluminescence intensity of the MAPBBr3 PeNCs, whereas cesium cations can improve the structural stability owing to the increased valance bond intensity. This work provides useful thoughts for the synthesis of high-performance optoelectronic devices based on mixed-cation PeNCs.