Correlation of Dimer-Linker-Induced Conformational Lock with Nonradiative Energy Loss in Organic Solar Cells

Huanhuan Gao; Baobing Fan; Liyang Yu; Yiwen Wang; Ruipeng Li; Wenlin Jiang; Tianqi Chen; Jie Zeng; Francis R. Lin; Bin Kan; Hongxiang Li; Lei Wang; Alex K.-Y. Jen

doi:10.1021/acsenergylett.4c02429

Correlation of Dimer-Linker-Induced Conformational Lock with Nonradiative Energy Loss in Organic Solar Cells

Huanhuan Gao, Baobing Fan^*, Liyang Yu, Yiwen Wang, Ruipeng Li, Wenlin Jiang, Tianqi Chen, Jie Zeng, Francis R. Lin, Bin Kan, Hongxiang Li, Lei Wang, Alex K.-Y. Jen^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

8 Citations (Scopus)

Abstract

The efficiencies of dimer-based devices still lag those of their small molecule-based counterparts. This is primarily due to the considerable dihedrals in the dimer skeleton, which compromises the molecular packing, thus influencing the charge generation and nonradiative voltage loss (ΔV_oc,_nr). Herein, we developed two dimeric acceptors with varied π-linkers to investigate the influence of linker-induced conformational lock on ΔV_oc,_nr. We find that the helically lapped O-shaped dimer delivers better intermolecular packing than the planar S-shaped one that incorporates a bulkier π-linker. However, its planar skeleton is instead more favorable for forming a compact and ordered stacking with the host acceptor in ternary blend. This possibly promotes exciton dissociation, thus reducing the nonradiative decay of excited states. Moreover, its longer exciton lifetime could offer additional charge-transfer channels. These contributions effectively minimize ΔV_oc,_nr to 0.195 eV, while delivering a high efficiency approaching 20% in the derived ternary device. © 2024 American Chemical Society.

Original language	English
Pages (from-to)	5541-5549
Journal	ACS Energy Letters
Volume	9
Issue number	11
Online published	25 Oct 2024
DOIs	https://doi.org/10.1021/acsenergylett.4c02429
Publication status	Published - 8 Nov 2024

Funding

A.K.-Y.J. is thankful for the sponsorship of the Lee Shau-Kee Chair Professor (Materials Science) and the support from the APRC Grant of the City University of Hong Kong (9380086, 9610419, 9610492, 9610508); the TCFS Grant (GHP/018/20SZ) and MRP Grant (MRP/040/21X) from the Innovation and Technology Commission of Hong Kong; the Green Tech Fund (202020164) from the Environment and Ecology Bureau of Hong Kong; the GRF grant (11307621, 11316422) from the Research Grants Council of Hong Kong; the CRF grant (C6023-19GF) from the Research Grants Council of Hong Kong; Shenzhen Science and Technology Program (SGDX20201103095412040); Guangzhou Huangpu Technology Bureau (2022GH02); Guangdong Major Project of Basic and Applied Basic Research (2019B030302007). H.G. acknowledges the financial support of Hong Kong Scholar program (XJ2021-038) and Young Talent Fund of Xi’an Association for Science and Technology (959202313080). The research used the Complex Materials Scattering (CMS) beamline of the National Synchrotron Light Source II (NSLS-II), which is a U.S. DOE Office of Science Facility, at Brookhaven National Laboratory under Contract No. DE-SC0012704.

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title = "Correlation of Dimer-Linker-Induced Conformational Lock with Nonradiative Energy Loss in Organic Solar Cells",

abstract = "The efficiencies of dimer-based devices still lag those of their small molecule-based counterparts. This is primarily due to the considerable dihedrals in the dimer skeleton, which compromises the molecular packing, thus influencing the charge generation and nonradiative voltage loss (ΔVoc,nr). Herein, we developed two dimeric acceptors with varied π-linkers to investigate the influence of linker-induced conformational lock on ΔVoc,nr. We find that the helically lapped O-shaped dimer delivers better intermolecular packing than the planar S-shaped one that incorporates a bulkier π-linker. However, its planar skeleton is instead more favorable for forming a compact and ordered stacking with the host acceptor in ternary blend. This possibly promotes exciton dissociation, thus reducing the nonradiative decay of excited states. Moreover, its longer exciton lifetime could offer additional charge-transfer channels. These contributions effectively minimize ΔVoc,nr to 0.195 eV, while delivering a high efficiency approaching 20% in the derived ternary device. {\textcopyright} 2024 American Chemical Society.",

author = "Huanhuan Gao and Baobing Fan and Liyang Yu and Yiwen Wang and Ruipeng Li and Wenlin Jiang and Tianqi Chen and Jie Zeng and Lin, {Francis R.} and Bin Kan and Hongxiang Li and Lei Wang and Jen, {Alex K.-Y.}",

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language = "English",

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T1 - Correlation of Dimer-Linker-Induced Conformational Lock with Nonradiative Energy Loss in Organic Solar Cells

AU - Gao, Huanhuan

AU - Fan, Baobing

AU - Yu, Liyang

AU - Wang, Yiwen

AU - Li, Ruipeng

AU - Jiang, Wenlin

AU - Chen, Tianqi

AU - Zeng, Jie

AU - Lin, Francis R.

AU - Kan, Bin

AU - Li, Hongxiang

AU - Wang, Lei

AU - Jen, Alex K.-Y.

PY - 2024/11/8

Y1 - 2024/11/8

N2 - The efficiencies of dimer-based devices still lag those of their small molecule-based counterparts. This is primarily due to the considerable dihedrals in the dimer skeleton, which compromises the molecular packing, thus influencing the charge generation and nonradiative voltage loss (ΔVoc,nr). Herein, we developed two dimeric acceptors with varied π-linkers to investigate the influence of linker-induced conformational lock on ΔVoc,nr. We find that the helically lapped O-shaped dimer delivers better intermolecular packing than the planar S-shaped one that incorporates a bulkier π-linker. However, its planar skeleton is instead more favorable for forming a compact and ordered stacking with the host acceptor in ternary blend. This possibly promotes exciton dissociation, thus reducing the nonradiative decay of excited states. Moreover, its longer exciton lifetime could offer additional charge-transfer channels. These contributions effectively minimize ΔVoc,nr to 0.195 eV, while delivering a high efficiency approaching 20% in the derived ternary device. © 2024 American Chemical Society.

AB - The efficiencies of dimer-based devices still lag those of their small molecule-based counterparts. This is primarily due to the considerable dihedrals in the dimer skeleton, which compromises the molecular packing, thus influencing the charge generation and nonradiative voltage loss (ΔVoc,nr). Herein, we developed two dimeric acceptors with varied π-linkers to investigate the influence of linker-induced conformational lock on ΔVoc,nr. We find that the helically lapped O-shaped dimer delivers better intermolecular packing than the planar S-shaped one that incorporates a bulkier π-linker. However, its planar skeleton is instead more favorable for forming a compact and ordered stacking with the host acceptor in ternary blend. This possibly promotes exciton dissociation, thus reducing the nonradiative decay of excited states. Moreover, its longer exciton lifetime could offer additional charge-transfer channels. These contributions effectively minimize ΔVoc,nr to 0.195 eV, while delivering a high efficiency approaching 20% in the derived ternary device. © 2024 American Chemical Society.

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U2 - 10.1021/acsenergylett.4c02429

DO - 10.1021/acsenergylett.4c02429

M3 - RGC 21 - Publication in refereed journal

SN - 2380-8195

VL - 9

SP - 5541

EP - 5549

JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 11

ER -

Correlation of Dimer-Linker-Induced Conformational Lock with Nonradiative Energy Loss in Organic Solar Cells

Abstract

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GRF: Molecular Engineering of 1D Hybrid Perovskites for Improving the Performance and Stability of Metal Halide Perovskite Solar Cells

ITF: Development of Efficient and Stable Perovskite Solar Cell with Safe-to-Use

GTF_EPD: Development of Printable Perovskite Solar Cells for Transformative Clean Energy and Sustainable Society

Cite this

Correlation of Dimer-Linker-Induced Conformational Lock with Nonradiative Energy Loss in Organic Solar Cells

Abstract

Funding

UN SDGs

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Projects

GRF: Molecular Engineering of 1D Hybrid Perovskites for Improving the Performance and Stability of Metal Halide Perovskite Solar Cells

ITF: Development of Efficient and Stable Perovskite Solar Cell with Safe-to-Use

GTF_EPD: Development of Printable Perovskite Solar Cells for Transformative Clean Energy and Sustainable Society

Cite this