biostudies-literatureUnknown16(41)Ravi MDeveloping novel, cost-effective hole-transporting materials (HTMs) with tailored chemical/electronic properties is critical for high-performance, stable planar perovskite solar cells (PSCs). Herein, we design three HTMs based on a di-trifluoromethyl-substituted phenoxazine core linked to distinct peripheral end groups: pcz-SM-DM, pcz-DM, and pcz-SM. The polyfluorinated core effectively passivates interfacial defects, while peripheral dimethyl fluorene units modulate HTM energy levels and charge carrier mobilities. Among these reported HTMs, pcz-SM exhibits the most suitable energy alignment and enhanced hole transport. Devices using pcz-SM as the HTM achieve an exceptional power conversion efficiency (PCE) of 25.3% and maintain 81% initial stability after 1000 hours of ambient aging. ThesChemical science19205-19214https://www.ebi.ac.uk/biostudies/studies/S-EPMC12444427biostudies-literatureBoosting planar perovskite solar cell performance <i>via</i> peripheral end-group engineering of phenoxazine-core hole transport materials.PMC12444427Kumar DXia ZRavi MTian YRavichandran BCheng MWang HChen CfalseBoosting planar perovskite solar cell performance <i>via</i> peripheral end-group engineering of phenoxazine-core hole transport materials.Developing novel, cost-effective hole-transporting materials (HTMs) with tailored chemical/electronic properties is critical for high-performance, stable planar perovskite solar cells (PSCs). Herein, we design three HTMs based on a di-trifluoromethyl-substituted phenoxazine core linked to distinct peripheral end groups: pcz-SM-DM, pcz-DM, and pcz-SM. The polyfluorinated core effectively passivates interfacial defects, while peripheral dimethyl fluorene units modulate HTM energy levels and charge carrier mobilities. Among these reported HTMs, pcz-SM exhibits the most suitable energy alignment and enhanced hole transport. Devices using pcz-SM as the HTM achieve an exceptional power conversion efficiency (PCE) of 25.3% and maintain 81% initial stability after 1000 hours of ambient aging. Thes2025-01-01T00:00:00Z2025 Oct2026-06-04T16:25:32.123Z2026-06-02T03:08:46.755ZS-EPMC124444274097987910.1039/d5sc04399a