Understanding effects of two different acceptors in one small molecule for solution processable organic solar cells

Yifan Zhao; Liu Yuan; Jianqi Zhang; Lingyun Zhu; Kun Lu; Wei Yan; Zhixiang Wei

doi:10.1039/c5ra12462j

Understanding effects of two different acceptors in one small molecule for solution processable organic solar cells

Yifan Zhao
, Liu Yuan
, Jianqi Zhang
, Lingyun Zhu
, Kun Lu
, Wei Yan
, Zhixiang Wei

School of Energy and Power Engineering

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

Abstract

Introducing two different electron-withdrawing groups into the molecular backbone is one of the effective methods to extend absorption and lower the highest occupied molecular orbital (HOMO) energy level for a high open-circuit voltage (V_oc). However, examples of two-acceptor type small molecules are less studied. In order to understand the effect of two acceptors, two kinds of small molecules named as BDT(dFBT-TT)₂ with a single acceptor unit and BDT(dFBT-ON)₂ with two acceptor units have been synthesized, respectively. However, the power conversion efficiency (PCE) of the BDT(dFBT-ON)₂ device is lower (3.54%) than that of BDT(dFBT-TT)₂ (5.55%). Grazing incidence wide angle X-ray scattering (GIWAXS) and the intensity dependence of current-voltage characteristics were used to study the spatially periodic order and charge recombination of these small molecules. Although the V_oc of BDT(dFBT-ON)₂ is higher than that of BDT(dFBT-TT)₂, the short circuit current (J_sc) of BDT(dFBT-ON)₂ is lower due to a higher ratio of charge carrier recombination. For the sake of getting a high V_oc and J_sc simultaneously in the future, this work would supply valuable insights for designing multi-acceptor-type small molecules.

Original language	English
Pages (from-to)	61703-61709
Number of pages	7
Journal	RSC Advances
Volume	5
Issue number	76
DOIs	https://doi.org/10.1039/c5ra12462j
State	Published - 2015

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@article{8d92192789864717a50ff46cfdddeb3d,

title = "Understanding effects of two different acceptors in one small molecule for solution processable organic solar cells",

abstract = "Introducing two different electron-withdrawing groups into the molecular backbone is one of the effective methods to extend absorption and lower the highest occupied molecular orbital (HOMO) energy level for a high open-circuit voltage (Voc). However, examples of two-acceptor type small molecules are less studied. In order to understand the effect of two acceptors, two kinds of small molecules named as BDT(dFBT-TT)2 with a single acceptor unit and BDT(dFBT-ON)2 with two acceptor units have been synthesized, respectively. However, the power conversion efficiency (PCE) of the BDT(dFBT-ON)2 device is lower (3.54\%) than that of BDT(dFBT-TT)2 (5.55\%). Grazing incidence wide angle X-ray scattering (GIWAXS) and the intensity dependence of current-voltage characteristics were used to study the spatially periodic order and charge recombination of these small molecules. Although the Voc of BDT(dFBT-ON)2 is higher than that of BDT(dFBT-TT)2, the short circuit current (Jsc) of BDT(dFBT-ON)2 is lower due to a higher ratio of charge carrier recombination. For the sake of getting a high Voc and Jsc simultaneously in the future, this work would supply valuable insights for designing multi-acceptor-type small molecules.",

author = "Yifan Zhao and Liu Yuan and Jianqi Zhang and Lingyun Zhu and Kun Lu and Wei Yan and Zhixiang Wei",

note = "Publisher Copyright: {\textcopyright} 2015 The Royal Society of Chemistry.",

year = "2015",

doi = "10.1039/c5ra12462j",

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T1 - Understanding effects of two different acceptors in one small molecule for solution processable organic solar cells

AU - Zhao, Yifan

AU - Yuan, Liu

AU - Zhang, Jianqi

AU - Zhu, Lingyun

AU - Lu, Kun

AU - Yan, Wei

AU - Wei, Zhixiang

PY - 2015

Y1 - 2015

N2 - Introducing two different electron-withdrawing groups into the molecular backbone is one of the effective methods to extend absorption and lower the highest occupied molecular orbital (HOMO) energy level for a high open-circuit voltage (Voc). However, examples of two-acceptor type small molecules are less studied. In order to understand the effect of two acceptors, two kinds of small molecules named as BDT(dFBT-TT)2 with a single acceptor unit and BDT(dFBT-ON)2 with two acceptor units have been synthesized, respectively. However, the power conversion efficiency (PCE) of the BDT(dFBT-ON)2 device is lower (3.54%) than that of BDT(dFBT-TT)2 (5.55%). Grazing incidence wide angle X-ray scattering (GIWAXS) and the intensity dependence of current-voltage characteristics were used to study the spatially periodic order and charge recombination of these small molecules. Although the Voc of BDT(dFBT-ON)2 is higher than that of BDT(dFBT-TT)2, the short circuit current (Jsc) of BDT(dFBT-ON)2 is lower due to a higher ratio of charge carrier recombination. For the sake of getting a high Voc and Jsc simultaneously in the future, this work would supply valuable insights for designing multi-acceptor-type small molecules.

AB - Introducing two different electron-withdrawing groups into the molecular backbone is one of the effective methods to extend absorption and lower the highest occupied molecular orbital (HOMO) energy level for a high open-circuit voltage (Voc). However, examples of two-acceptor type small molecules are less studied. In order to understand the effect of two acceptors, two kinds of small molecules named as BDT(dFBT-TT)2 with a single acceptor unit and BDT(dFBT-ON)2 with two acceptor units have been synthesized, respectively. However, the power conversion efficiency (PCE) of the BDT(dFBT-ON)2 device is lower (3.54%) than that of BDT(dFBT-TT)2 (5.55%). Grazing incidence wide angle X-ray scattering (GIWAXS) and the intensity dependence of current-voltage characteristics were used to study the spatially periodic order and charge recombination of these small molecules. Although the Voc of BDT(dFBT-ON)2 is higher than that of BDT(dFBT-TT)2, the short circuit current (Jsc) of BDT(dFBT-ON)2 is lower due to a higher ratio of charge carrier recombination. For the sake of getting a high Voc and Jsc simultaneously in the future, this work would supply valuable insights for designing multi-acceptor-type small molecules.

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U2 - 10.1039/c5ra12462j

DO - 10.1039/c5ra12462j

M3 - 文章

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SN - 2046-2069

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JO - RSC Advances

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ER -

Understanding effects of two different acceptors in one small molecule for solution processable organic solar cells

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