PbI-enriched mixed perovskite film [FAMAPb(IBr)] has been widely studied due to its great potential in perovskite solar cell (PSC) applications. Herein, a FAMAPb(IBr) film has been fabricated with the temperature-dependent optical absorption spectra utilized to determine its exciton binding energy. A ∼13 meV exciton binding energy is estimated, and a near-unity fraction of free carriers out of the total photoexcitons has been obtained in the solar cell operating regime at equilibrium state. PSCs are fabricated with this mixed perovskite film, but a significant electron transport barrier at the TiO-perovskite interface limited their performance. CsCO and CsI are then utilized as functional enhancers with which to substantially balance the electron and hole transport and increase the carriers (both electrons and holes) mobilities in PSCs, resulting in much-improved solar-cell performance. The modified PSCs exhibit reproducible power conversion efficiency (PCE) values with little hysteresis effect in the J-V curves, achieving PCEs up to 19.5% for the CsCO-modified PSC and 20.6% when subsequently further doped with CsI.

Composite materials are increasingly being used as an accepted alternative to traditional structural materials throughout the globe for various engineering applications. Because of their superior properties and flexibility, these materials are beginning to find innumerable applications replacing existing materials, especially in high‐performance engineering domains. The electrospinning process adds a further dimension to enhance the properties of the composite material family by incorporating fibers at their microscale to even sub‐nanoscale, enabling the development of advanced composites with enhanced properties. Over the past decades, much research work has understandably been done on these exciting materials. This paper aims to comprehensively map some of the trends in electrospun nanofiber interleaved laminated composite development, marking the milestones achieved and challenges faced. A brief review of the potential applications for these materials will also be put forward in the research outlook for these advanced nanoengineered composites.

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