Novel (X‐DADAD)_n Polymers with Phenylene and Fluorene Blocks as Promising Electronic Materials for Organic and Perovskite Solar Cells

Abstract

Herein, the synthesis of two novel (X‐DADAD)n conjugated polymers comprising phenylene or fluorene X blocks coupled with benzothiadiazole acceptor (A) and thiophene donor (D) units is reported. The designed polymers are explored as absorber materials in organic solar cells and hole‐transport materials (HTMs) in perovskite solar cells (PSCs). The encouraging efficiencies of ≈17% are obtained in PSCs when using fluorene‐containing polymer P2 featuring this material as a promising HTM for the state‐of‐the‐art perovskite photovoltaics.

Impact of Synthetic Route on Photovoltaic Properties of Isoindigo‐Containing Conjugated Polymers

“…It is well known that conjugated polymers can be applied as charge transport interlayers in perovskite solar cells (PSCs), which is also valid for the family of ICPs. [ 13–15 ] In particular, ICPs can be considered as promising hole‐transport materials (HTMs) for PSCs. First of all, the electronic properties of ICPs can be easily tuned to fit the energy level alignment criteria (HOMO of the polymer should be in alignment with the perovskite valence band), thus providing efficient and selective hole extraction from the photoactive perovskite material.…”