Flexible, All‐Inorganic CsPbBr₃ Perovskite Solar Cells Tailored by Heat‐resistant Muscovite Substrates

Abstract

All‐inorganic CsPbBr3 perovskite solar cells (PSCs) have attracted tremendous attention, owing to their excellent stability and rising power conversion efficiency. However, the mechanical flexibility of these solar cells has ground to a standstill because of the high‐temperature requirement for ideal CsPbBr3 perovskite films. In this study, a flexible CsPbBr3 PSC with an efficiency of 5.71 % has been made by means of fabricating a heat‐resistant conductive muscovite substrate, which demonstrates very high mechanical flexibility with nearly unchanged resistance even after 4000 bending cycles (12000 cycles of concave and convex bending for PSCs), owing to the weak van der Waals force and layered structure. Implementation of the muscovite substrate enables the fabrication of flexible PSCs under high‐temperature conditions, providing a new path to increase the efficiency without lowering the crystallization temperature of state‐of‐the‐art electron‐transporting materials and perovskite films in the future.

Micro‐Nano Structure Functionalized Perovskite Optoelectronics: From Structure Functionalities to Device Applications

“…[ 87,258,269–273 ] The deformable micro‐nano structure is not only favorable to the optical and electronic performances, but also mitigates the brittleness of perovskite‐based devices as mechanical buffer layer releasing the concentrated stress. [ 23,186,274–279 ] Tavakoli et al. presented the flexible perovskite SCs on an epoxy substrate with inverted nanocone structure.…”

“…[87,258,[269][270][271][272][273] The deformable micro-nano structure is not only favorable to the optical and electronic performances, but also mitigates the brittleness of perovskite-based devices as mechanical buffer layer releasing the concentrated stress. [23,186,[274][275][276][277][278][279] Tavakoli et al presented the flexible perovskite SCs on an epoxy substrate with inverted nanocone structure. During flexural state, the tensile stress was concentrated on the valley of inverted nanocone structure, and the perovskite film was in a position with less stress (Figure 16a).…”

Recent Progress of Carbon‐Based Inorganic Perovskite Solar Cells: From Efficiency to Stability

“…In addition, several novel strategies have also been attempted to fabricate CsBX 3 , such as annealing process optimization, [37,130,[166][167][168][169] spray-coating process, [170,171] intermediate phase assisted sequential deposition, [172] gradient cooling process, [173] benign pinholes, [162] light-processing technology, [159] substrate optimization (moth-eye antireflector and muscovite), [174,175] fluxmediated crystal growth strategy, [176] drop-coating method, [177] halide exchange, [178] direct molecule substitution, [179] ambient environment fabrication, [117,180] phase transition induced method, [131] two-step infiltration-spinning method, [181] mist deposition method, [182] hybrid CVD (HCVD), [183] single-source electron beam evaporation, [183,184] UV-ozone post-treatment, [185] air blowing recipe, [186] two-step sintering (TSS) method, [133] electrodeposition, [187] hot-flow-assisted spin-coating approach, [39] intermolecular exchange strategy, [188] hot-pressing method, [189] and so on.…”

Flexible and Wearable Optoelectronic Devices Based on Perovskites

“…[32,50,98] Xu et al fabricated flexible CsPbBr 3 solar cells by using a 6.5 µm conductive muscovite substrate at high temperature. [167] The ITO electrode was prepared by spin coating and then annealed several times at 500 °C. The substrate had excellent transmittance and mechanical flexibility.…”