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Conjugated polyelectrolytes (CPEs) are promising hole transport materials for perovskite solar cells, whereas their severe intermolecular aggregation significantly affects the device performance. Here, long-chain alkyl imidazolium ionic liquid (IL) of 1-dodecyl-3-methylimidazolium bromide ([C 12 mim]Br) and conjugated polyelectrolytes of potassium poly[3-(4-carboxylatebutyl)thiophene (P3CT-K) are combined with different mass ratios. The UV–vis spectra and dynamic light scattering studies indicate that the aggregation behavior of P3CT-K is suppressed by IL, thus obtaining a smoother hole transport layer for the latter device fabrication, which efficiently improves the film quality of perovskite absorber and enhances the hole transport at the interface. As a consequence, the inverted PSCs based on P3CT-K/IL film as the HTL show considerable improvement in power conversion efficiency (PCE), from 16.21% to 18.81%, compared with pristine P3CT-K based device. These findings indicate that IL can effectively inhibit the aggregation of CPEs, providing a new pathway to further improve the performance of PSCs based on CPEs interlayer.

Conjugated Polyelectrolyte Combined with Ionic Liquid as the Hole Transport Layer for Efficient Inverted Perovskite Solar Cells