Enhanced Photocatalytic and Photovoltaic Performance Arising from Unconventionally Low Donor–Y6 Ratios

• DOI: 10.1002/adma.202309672
• Publication Date: 2024-01-11T14:24:43Z
• Authors: Andrew Dolan; Xun Pan; Matthew J. Griffith; Anirudh Sharma; Jessica M. de la ...; Derya Baran; Gregory F. Metha; David M. Huang; Tak W. Kee; Mats R. Andersson
• Keywords: Ambipolar diffusion; Charge carrier; Acceptor; Electron Mobility

Abstract Development of both organic photovoltaics (OPVs) and photocatalysts has focused on utilizing the bulk heterojunction (BHJ). The BHJ promotes charge separation enhances carrier lifetime, but may give rise to increased traps, hindering performance. Here, high photocatalytic photovoltaic performance is displayed by electron donor–acceptor (D–A) nanoparticles (NPs) films, using nonfullerene acceptor Y6 polymer donor PIDT‐T8BT. In contrast conventional D–A systems, generation in PIDT‐T8BT:Y6 NPs mainly driven Y6, allowing a even at low D:A mass ratio 1:50. attributed amorphous behavior Low ratios are generally thought yield lower efficiency than more ≈1:1 ratio. However, OPVs exhibit peak 1:5. Similarly used for hydrogen evolution show 1:6.7 Interestingly, system, as proportion increases, reduced observed. unconventional provide recombination losses charge‐carrier lifetime with undisrupted ambipolar transport enabling better ratios. This work reports novel light‐harvesting materials which due unfavorable morphology move toward 1:1.2–1:1.