A polymer acceptor containing a B ← N unit with strong fluorescence for organic photovoltaics

Jiahui Wang; Yuyue Gao; Liuqing Yang; Xiaodong Yin; Lu Zhang; Shumeng Wang; Zhiyuan Xie; Jun Liu; Lixiang Wang

doi:10.1039/d2tc01401g

A polymer acceptor containing a B ← N unit with strong fluorescence for organic photovoltaics

Jiahui Wang, Yuyue Gao, Liuqing Yang, Xiaodong Yin, Lu Zhang, Shumeng Wang, Zhiyuan Xie, Jun Liu^*, Lixiang Wang

^*Corresponding author for this work

School of Chemistry and Chemical Engineering

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

The power conversion efficiency (PCE) of organic solar cells (OSCs) is limited by the large non-radiation energy loss (ΔE_nr), which is due to the low fluorescence quantum efficiency (φ_F) of typical organic/polymer photovoltaic materials. In this manuscript, we report a polymer acceptor containing a B ← N unit with strong red fluorescence. The polymer, PBN-16, is the alternating copolymer of an electron-withdrawing B ← N-bridged bipyridine (BNBP) unit and an electron-donating 2,5-dithienyl-1,4-dichlorophenylene unit. PBN-16 exhibits φ_F of as high as 11% in thin film because of the near-unity φ_F of BNBP itself and the twisted configuration of the polymer backbone. Its all-polymer photovoltaic device shows an open-circuit voltage (V_OC) of 1.33 V and a PCE of 6.0% under AM 1.5G illumination as well as a V_OC of 1.17 V and a PCE of 15.4% under indoor light-emitting diode illumination. Organic light-emitting diode devices using PBN-16 as an emissive material emit pure red light with a luminance efficiency of 0.99 cd A⁻¹ and CIE coordinates of (0.67, 0.32). These results confirm that conjugated polymers or small molecules containing a B ← N unit are promising for organic solar cells with minimized energy loss and high PCE.

Original language	English
Pages (from-to)	10860-10865
Number of pages	6
Journal	Journal of Materials Chemistry C
Volume	10
Issue number	30
DOIs	https://doi.org/10.1039/d2tc01401g
Publication status	Published - 14 Jul 2022

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title = "A polymer acceptor containing a B ← N unit with strong fluorescence for organic photovoltaics",

abstract = "The power conversion efficiency (PCE) of organic solar cells (OSCs) is limited by the large non-radiation energy loss (ΔEnr), which is due to the low fluorescence quantum efficiency (φF) of typical organic/polymer photovoltaic materials. In this manuscript, we report a polymer acceptor containing a B ← N unit with strong red fluorescence. The polymer, PBN-16, is the alternating copolymer of an electron-withdrawing B ← N-bridged bipyridine (BNBP) unit and an electron-donating 2,5-dithienyl-1,4-dichlorophenylene unit. PBN-16 exhibits φF of as high as 11% in thin film because of the near-unity φF of BNBP itself and the twisted configuration of the polymer backbone. Its all-polymer photovoltaic device shows an open-circuit voltage (VOC) of 1.33 V and a PCE of 6.0% under AM 1.5G illumination as well as a VOC of 1.17 V and a PCE of 15.4% under indoor light-emitting diode illumination. Organic light-emitting diode devices using PBN-16 as an emissive material emit pure red light with a luminance efficiency of 0.99 cd A−1 and CIE coordinates of (0.67, 0.32). These results confirm that conjugated polymers or small molecules containing a B ← N unit are promising for organic solar cells with minimized energy loss and high PCE.",

author = "Jiahui Wang and Yuyue Gao and Liuqing Yang and Xiaodong Yin and Lu Zhang and Shumeng Wang and Zhiyuan Xie and Jun Liu and Lixiang Wang",

note = "Publisher Copyright: {\textcopyright} 2022 The Royal Society of Chemistry.",

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T1 - A polymer acceptor containing a B ← N unit with strong fluorescence for organic photovoltaics

AU - Wang, Jiahui

AU - Gao, Yuyue

AU - Yang, Liuqing

AU - Yin, Xiaodong

AU - Zhang, Lu

AU - Wang, Shumeng

AU - Xie, Zhiyuan

AU - Liu, Jun

AU - Wang, Lixiang

PY - 2022/7/14

Y1 - 2022/7/14

N2 - The power conversion efficiency (PCE) of organic solar cells (OSCs) is limited by the large non-radiation energy loss (ΔEnr), which is due to the low fluorescence quantum efficiency (φF) of typical organic/polymer photovoltaic materials. In this manuscript, we report a polymer acceptor containing a B ← N unit with strong red fluorescence. The polymer, PBN-16, is the alternating copolymer of an electron-withdrawing B ← N-bridged bipyridine (BNBP) unit and an electron-donating 2,5-dithienyl-1,4-dichlorophenylene unit. PBN-16 exhibits φF of as high as 11% in thin film because of the near-unity φF of BNBP itself and the twisted configuration of the polymer backbone. Its all-polymer photovoltaic device shows an open-circuit voltage (VOC) of 1.33 V and a PCE of 6.0% under AM 1.5G illumination as well as a VOC of 1.17 V and a PCE of 15.4% under indoor light-emitting diode illumination. Organic light-emitting diode devices using PBN-16 as an emissive material emit pure red light with a luminance efficiency of 0.99 cd A−1 and CIE coordinates of (0.67, 0.32). These results confirm that conjugated polymers or small molecules containing a B ← N unit are promising for organic solar cells with minimized energy loss and high PCE.

AB - The power conversion efficiency (PCE) of organic solar cells (OSCs) is limited by the large non-radiation energy loss (ΔEnr), which is due to the low fluorescence quantum efficiency (φF) of typical organic/polymer photovoltaic materials. In this manuscript, we report a polymer acceptor containing a B ← N unit with strong red fluorescence. The polymer, PBN-16, is the alternating copolymer of an electron-withdrawing B ← N-bridged bipyridine (BNBP) unit and an electron-donating 2,5-dithienyl-1,4-dichlorophenylene unit. PBN-16 exhibits φF of as high as 11% in thin film because of the near-unity φF of BNBP itself and the twisted configuration of the polymer backbone. Its all-polymer photovoltaic device shows an open-circuit voltage (VOC) of 1.33 V and a PCE of 6.0% under AM 1.5G illumination as well as a VOC of 1.17 V and a PCE of 15.4% under indoor light-emitting diode illumination. Organic light-emitting diode devices using PBN-16 as an emissive material emit pure red light with a luminance efficiency of 0.99 cd A−1 and CIE coordinates of (0.67, 0.32). These results confirm that conjugated polymers or small molecules containing a B ← N unit are promising for organic solar cells with minimized energy loss and high PCE.

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A polymer acceptor containing a B ← N unit with strong fluorescence for organic photovoltaics

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