Engineered Cathode Buffer Layers for Highly Efficient Organic Solar Cells: A Review

This article presents an in-depth insight into the most efficient cathode buffer layers (CBLs) in conventional and inverted organic solar cells (OSCs). The CBL can play a critical role in improving the short circuit current density (J(sc)) and fill factor (FF) of the devices by minimizing the contact resistance and reducing charge recombination at electrode/photoactive layer interface, resulting in the efficient extraction of charge carriers and therefore improving the power conversion efficiency (PCE). This review explores CBL with respect to its effect on the physics of a device and electronic processes at the interface of CBL/photoactive layer and its impact on the overall performance of OSCs. Besides this, the role of CBL, its chemical composition, morphology, thickness, dopants, deposition conditions, etc., and their corresponding effects on the device performance of both conventional and inverted OSCs are discussed in detail. Finally, CBLs that provide the best performance are summarized and their chemical structures are discussed. This article will benefit the researchers working in the domain of OSCs by providing an understanding of the CBL layers, along with various interfacial processes.

Automated summary

This article provides a detailed insight into the efficient cathode buffer layers (CBLs) in conventional and inverted organic solar cells (OSCs). The CBL can improve the performance of the devices by reducing contact resistance and charge recombination, leading to efficient charge extraction and enhanced power conversion efficiency. The chemical composition, morphology, thickness, dopants, and deposition conditions of CBL and their effects on device performance are discussed. The best performing CBLs are summarized and their chemical structures are examined.