Switching From Acceptor to FRET Donor: How the Organic Solar Cell Architecture Can Change the Role of a Chromophore

IF 18.5 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Advanced Functional Materials Pub Date : 2025-01-17 DOI:10.1002/adfm.202420416
Hui Jin, Neil Mallo, Guanran Zhang, Oliver Lindsay, Ronan Chu, Mile Gao, Shaun McAnally, Isaac M. Etchells, Paul L. Burn, Ian R. Gentle, Paul E. Shaw
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Abstract

The third component in a ternary organic solar cell (OSC) is generally selected to maximize absorption of the solar spectrum. The fused ring non-fullerene acceptor 2,2′-[({4,4,9,9-tetra-n-octyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl}bis{benzo[c][1,2,5]thiadiazole-7,4-diyl})bis(methaneylylidene)]dimalononitrile (o-IDT-BT-DCV) was investigated for use in binary and ternary OSCs. The optimized binary device with o-IDT-BT-DCV as the acceptor and PM6 as the donor had a maximum power conversion efficiency (PCE) of 10.8%. Incorporation of o-IDT-BT-DCV into a donor:acceptor PM6:Y6 blend delivered a ternary OSC with a maximum PCE of 16.2%. Femtosecond transient absorption spectroscopy (fs-TAS), transient photovoltage (TPV), and transient photocurrent (TPC) measurements in combination showed that o-IDT-BT-DCV in the ternary blend did not behave as an acceptor. Instead, it contributed to charge carrier generation through a sub-picosecond energy transfer process to Y6, followed by a photoinduced hole transfer mechanism with PM6 and/or spontaneous exciton dissociation within the Y6 phase. Encapsulated ternary blend devices were found to be more stable than the binary blend solar cells. Under 1-sun illumination and maximum power point (MPP) tracking, excluding the initial burn-in loss, the ternary device retained ≈80% of its MPP over 1200 h compared to the 40% retained by the PM6:Y6 devices.

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来源期刊
Advanced Functional Materials
Advanced Functional Materials 工程技术-材料科学:综合
CiteScore
29.50
自引率
4.20%
发文量
2086
审稿时长
2.1 months
期刊介绍: Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.
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