Perovskite‐Coupled NIR Organic Hybrid Solar Cells Achieving an 84.2% Fill Factor and a 25.2% Efficiency: A Comprehensive Mechanistic Exploration

Angewandte Chemie, Journal Year: 2025, Volume and Issue: unknown

Published: March 12, 2025

Abstract The integration of organic dyes in perovskite solar cells (PSCs) to utilize near‐infrared (NIR) photons remains a challenge. In this study, selenium‐incorporated ortho‐benzodipyrrole‐based NIR dye CB‐2Se was developed. CB‐2Se, featuring lower bandgap 1.35 eV, blended with PCBM form bulk‐heterojunction layer PSCs for electron extraction and transport. Compared Y6‐16 acceptor, the removal Tz unit suppresses self‐aggregation, improving its compatibility PCBM. A CB‐2Se:PCBM‐incorporated PSC achieved remarkable power conversion efficiency (PCE) 25.18% V OC 1.164 V, J SC 25.71 mA/cm 2 , Fill Factor 84.15%, outperforming that PCBM‐only reference device (24.35%) PCBM:Y6‐16‐based (24.49%). PCBM:CB‐2Se enhanced long‐term stability PSCs, retaining 88% initial after 1000 h under ambient air thermal conditions. photophysical interactions between have been comprehensively investigated by using femtosecond transient absorption spectroscopy. Ultrafast exciton separation into free charges occurs within 200 femtoseconds at interfaces CB‐2Se. For first time, transfer holes from back detected, providing valuable insights charge dynamics utilizing dyes.

Language: Английский

Regioregular Alternating Polychalcogenophenes‐Block‐Poly(3‐hexylthiophene): Synthesis, Structural Characterizations, Molecular Properties, and Transistors

Chemistry - An Asian Journal, Journal Year: 2025, Volume and Issue: unknown

Published: April 10, 2025

Abstract Sequence‐controlled polychalcogenophenes have attracted considerable attention in polymer science, particularly terms of their synthesis, structure, and functionality. In this work, we designed a new series alternating block conjugated copolymers, denoted as poly( alt ‐AB) b (3HT), where one consists an copolymer the other is poly(3‐hexylthiophene) (P3HT). To construct three sequence‐controlled polychalcogenophenes, utilized 3‐hexylthiophene (S), 3‐hexylselenophene (Se), 3‐hexyltellurophene (Te) A B units, yielding P(SSe) P(STe) P(SeTe) respectively. These polymers were synthesized via nickel‐catalyzed Kumada polymerization by sequentially introducing two different Grignard monomers. Through catalyst‐transfer polycondensation (CTP), achieved precise control over molecular weight, dispersity, length, main chain sequence. The structures with high side regioregularity both blocks definitively confirmed using ¹H ¹ 3 C NMR analyses. Grazing‐incidence wide‐angle X‐ray scattering (GIWAXS) revealed that all predominantly adopt edge‐on orientation solid state. organic field‐effect transistor (OFET) measurements, (3HT) exhibited highest hole mobility 4.4 × 10⁻ 2 cm V⁻¹ s⁻¹, attributed to its highly ordered packing thin films. Notably, 2.9 among reported for tellurophene‐containing polychalcogenophenes.

Language: Английский

Perfluorophenyl-Incorporated Ferrocene: A Non-Volatile Solid Additive for Boosting Efficiency and Stability in Organic Solar Cells

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: May 20, 2025

In this study, we designed and synthesized a new non-volatile solid additive FcF10 by integrating two pentafluorophenyl (C6F5) groups into the cyclopentadienyl (CP) rings of ferrocene (Fc) through ester linkages. The with three-dimensional (3D) framework facilitated morphological optimization in PM6:Y6 system combination π···π, F···π, F···F interactions between CP C6F5 C6F2 Y6. FcF10-incorporated (3.75 wt %) PM6:Y6-based solar cell device achieved higher power conversion efficiency (PCE) 17.00%, Voc 0.85 V, Jsc 27.35 mA cm-2, an FF 73.29%, compared to pristine device. These improvements are attributed formation favorable active layer morphology, which enhances exciton dissociation charge transport while reducing bimolecular trap-assisted recombination. facilitates non-covalent Y6, such as F···F, π···π Cp FIC end supramolecular improve molecular stacking crystallinity within Y6 domain, evidenced red-shifted absorption, reduced π-π d-spacing, increased coherence lengths Furthermore, PM6:Y6:FcF10 demonstrates superior thermal stability, retaining 88% its initial PCE after prolonged annealing at 85 °C. Overall, incorporation achieves optimized stable donor-acceptor offering promising approach for high-performance thermally organic photovoltaics.

Language: Английский