Synergistic construction of ternary postprocessing-free organic solar cells using a volatile solid additive containing σ-hole and Y6 isomer

TY - GEN

T1 - Synergistic construction of ternary postprocessing-free organic solar cells using a volatile solid additive containing σ-hole and Y6 isomer

AU - Mao, Peng

AU - Zhang, Bao

AU - An, Qiaoshi

N1 - Publisher Copyright: © 2025 SPIE.

PY - 2025/8/19

Y1 - 2025/8/19

N2 - Postprocessing-free organic solar cells (OSCs) with great potential for low-cost commercial production are still at a backward stage of development. Here, we designed and synthesised Iso-Y6, an isomer of the classical non-fullerene receptor Y6, by introducing F-EG with a benzothiadiazole (BTP) core and an F-substituted end group to tune the performance parameters in ternary OSCs. Its UV-vis absorption spectrum covers the visible region (400-760 nm) and extends up to the near-infrared band with a narrow optical band gap and broad absorption bands. Given the weak interactions between the S atoms of the thiophene on the backbone and the O atoms of the carbonyl group at the end-group position form a conformational lock, leading to a reduction in structural disorder, an increase in molecular planarity, and an enhancement of crystallinity. Eventual, we have constructed ternary postprocessing-free OSCs with efficiency exceeding 17.6% by combining them with the conjugated polymer donor PM6 and acceptor Y6 using the solid additive DFBB, which is capable of producing σ-hole interactions with the active layer material.

AB - Postprocessing-free organic solar cells (OSCs) with great potential for low-cost commercial production are still at a backward stage of development. Here, we designed and synthesised Iso-Y6, an isomer of the classical non-fullerene receptor Y6, by introducing F-EG with a benzothiadiazole (BTP) core and an F-substituted end group to tune the performance parameters in ternary OSCs. Its UV-vis absorption spectrum covers the visible region (400-760 nm) and extends up to the near-infrared band with a narrow optical band gap and broad absorption bands. Given the weak interactions between the S atoms of the thiophene on the backbone and the O atoms of the carbonyl group at the end-group position form a conformational lock, leading to a reduction in structural disorder, an increase in molecular planarity, and an enhancement of crystallinity. Eventual, we have constructed ternary postprocessing-free OSCs with efficiency exceeding 17.6% by combining them with the conjugated polymer donor PM6 and acceptor Y6 using the solid additive DFBB, which is capable of producing σ-hole interactions with the active layer material.

KW - isomer

KW - organic solar cells

KW - postprocessing-free

KW - solid additive

UR - https://www.scopus.com/pages/publications/105024754794

U2 - 10.1117/12.3072676

DO - 10.1117/12.3072676

M3 - Conference contribution

AN - SCOPUS:105024754794

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - International Conference on Optoelectronic Information and Functional Materials, OIFM 2025

A2 - Hussain, Shahid

A2 - Ding, Jupeng

PB - SPIE

T2 - International Conference on Optoelectronic Information and Functional Materials, OIFM 2025

Y2 - 18 April 2025 through 20 April 2025

ER -