Energy level modulation of non-fullerene acceptors enables efficient organic solar cells with small energy loss

Qiaoshi An; Wei Gao; Fujun Zhang; Jian Wang; Miao Zhang; Kailong Wu; Xiaoling Ma; Zhenghao Hu; Chaoqun Jiao; Chuluo Yang

doi:10.1039/c7ta10763c

Energy level modulation of non-fullerene acceptors enables efficient organic solar cells with small energy loss

Qiaoshi An, Wei Gao, Fujun Zhang^*, Jian Wang, Miao Zhang, Kailong Wu, Xiaoling Ma, Zhenghao Hu, Chaoqun Jiao, Chuluo Yang

^*Corresponding author for this work

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

145 Citations (Scopus)

Abstract

Two new non-fullerene (NF) acceptors, namely BDTIT-M and BDTThIT-M, were rationally designed to optimize the energy levels and optical bandgap. BDTIT-M is derived by changing the end-group of NFBDT into slightly weak DCI-M, and BDTThIT-M is obtained by adding two conjugated thiophene side-chains into a ladder-type core of BDTIT-M. By incorporating with the polymer donor PBDB-T, BDTIT-M based organic solar cells (OSCs) deliver a higher PCE of 11.31% compared to that of NFBDT based cells, which is mainly attributed to the increased V_OC and FF. A higher PCE of 12.12% with a small energy loss of ∼0.588 eV is achieved compared with BDTThIT-M based OSCs, benefiting from the elevated LUMO level, narrowed bandgap, and enhanced absorption coefficient and electron mobility of BDTThIT-M compared with BDTIT-M. The combination of a methyl-modified end-group and conjugated side-chain should be an efficient strategy to elevate the LUMO and HOMO levels with different amplitudes for realizing simultaneous improvement in V_OC and J_SC.

Original language	English
Pages (from-to)	2468-2475
Number of pages	8
Journal	Journal of Materials Chemistry A
Volume	6
Issue number	6
DOIs	https://doi.org/10.1039/c7ta10763c
Publication status	Published - 2018
Externally published	Yes

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title = "Energy level modulation of non-fullerene acceptors enables efficient organic solar cells with small energy loss",

abstract = "Two new non-fullerene (NF) acceptors, namely BDTIT-M and BDTThIT-M, were rationally designed to optimize the energy levels and optical bandgap. BDTIT-M is derived by changing the end-group of NFBDT into slightly weak DCI-M, and BDTThIT-M is obtained by adding two conjugated thiophene side-chains into a ladder-type core of BDTIT-M. By incorporating with the polymer donor PBDB-T, BDTIT-M based organic solar cells (OSCs) deliver a higher PCE of 11.31% compared to that of NFBDT based cells, which is mainly attributed to the increased VOC and FF. A higher PCE of 12.12% with a small energy loss of ∼0.588 eV is achieved compared with BDTThIT-M based OSCs, benefiting from the elevated LUMO level, narrowed bandgap, and enhanced absorption coefficient and electron mobility of BDTThIT-M compared with BDTIT-M. The combination of a methyl-modified end-group and conjugated side-chain should be an efficient strategy to elevate the LUMO and HOMO levels with different amplitudes for realizing simultaneous improvement in VOC and JSC.",

author = "Qiaoshi An and Wei Gao and Fujun Zhang and Jian Wang and Miao Zhang and Kailong Wu and Xiaoling Ma and Zhenghao Hu and Chaoqun Jiao and Chuluo Yang",

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year = "2018",

doi = "10.1039/c7ta10763c",

language = "English",

volume = "6",

pages = "2468--2475",

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TY - JOUR

T1 - Energy level modulation of non-fullerene acceptors enables efficient organic solar cells with small energy loss

AU - An, Qiaoshi

AU - Gao, Wei

AU - Zhang, Fujun

AU - Wang, Jian

AU - Zhang, Miao

AU - Wu, Kailong

AU - Ma, Xiaoling

AU - Hu, Zhenghao

AU - Jiao, Chaoqun

AU - Yang, Chuluo

PY - 2018

Y1 - 2018

N2 - Two new non-fullerene (NF) acceptors, namely BDTIT-M and BDTThIT-M, were rationally designed to optimize the energy levels and optical bandgap. BDTIT-M is derived by changing the end-group of NFBDT into slightly weak DCI-M, and BDTThIT-M is obtained by adding two conjugated thiophene side-chains into a ladder-type core of BDTIT-M. By incorporating with the polymer donor PBDB-T, BDTIT-M based organic solar cells (OSCs) deliver a higher PCE of 11.31% compared to that of NFBDT based cells, which is mainly attributed to the increased VOC and FF. A higher PCE of 12.12% with a small energy loss of ∼0.588 eV is achieved compared with BDTThIT-M based OSCs, benefiting from the elevated LUMO level, narrowed bandgap, and enhanced absorption coefficient and electron mobility of BDTThIT-M compared with BDTIT-M. The combination of a methyl-modified end-group and conjugated side-chain should be an efficient strategy to elevate the LUMO and HOMO levels with different amplitudes for realizing simultaneous improvement in VOC and JSC.

AB - Two new non-fullerene (NF) acceptors, namely BDTIT-M and BDTThIT-M, were rationally designed to optimize the energy levels and optical bandgap. BDTIT-M is derived by changing the end-group of NFBDT into slightly weak DCI-M, and BDTThIT-M is obtained by adding two conjugated thiophene side-chains into a ladder-type core of BDTIT-M. By incorporating with the polymer donor PBDB-T, BDTIT-M based organic solar cells (OSCs) deliver a higher PCE of 11.31% compared to that of NFBDT based cells, which is mainly attributed to the increased VOC and FF. A higher PCE of 12.12% with a small energy loss of ∼0.588 eV is achieved compared with BDTThIT-M based OSCs, benefiting from the elevated LUMO level, narrowed bandgap, and enhanced absorption coefficient and electron mobility of BDTThIT-M compared with BDTIT-M. The combination of a methyl-modified end-group and conjugated side-chain should be an efficient strategy to elevate the LUMO and HOMO levels with different amplitudes for realizing simultaneous improvement in VOC and JSC.

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U2 - 10.1039/c7ta10763c

DO - 10.1039/c7ta10763c

M3 - Article

AN - SCOPUS:85041947184

SN - 2050-7488

VL - 6

SP - 2468

EP - 2475

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 6

ER -

Energy level modulation of non-fullerene acceptors enables efficient organic solar cells with small energy loss

Abstract

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