Achieving Highly Efficient Nonfullerene Organic Solar Cells with Improved Intermolecular Interaction and Open-Circuit Voltage

Huifeng Yao; Long Ye; Junxian Hou; Bomee Jang; Guangchao Han; Yong Cui; Gregory M Su; Cheng Wang; Bowei Gao; Runnan Yu; Hao Zhang; Yuanping Yi; Han Young Woo; Harald Ade; Jianhui Hou

doi:10.1002/adma.201700254

Achieving Highly Efficient Nonfullerene Organic Solar Cells with Improved Intermolecular Interaction and Open-Circuit Voltage

Adv Mater. 2017 Jun;29(21). doi: 10.1002/adma.201700254. Epub 2017 Mar 29.

Authors

Huifeng Yao^{1

2}, Long Ye³, Junxian Hou⁴, Bomee Jang⁵, Guangchao Han^{2

6}, Yong Cui^{1

2}, Gregory M Su⁷, Cheng Wang⁷, Bowei Gao^{1

2}, Runnan Yu^{1

2}, Hao Zhang^{1

2}, Yuanping Yi^{2

6}, Han Young Woo⁵, Harald Ade³, Jianhui Hou^{1

2}

Affiliations

¹ Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics and Chemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
² University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ Department of Physics and Organic and Carbon Electronics Lab (ORaCEL), North Carolina State University, Raleigh, NC, 27695, USA.
⁴ Department of Composite Materials and Engineering, College of Materials Science and Engineering, Hebei University of Engineering, Handan, 056038, P. R. China.
⁵ Department of Chemistry, Korea University, Seoul, 136-701, Republic of Korea.
⁶ Beijing National Laboratory for Molecular Science, Key Laboratory of Organic Solids Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
⁷ Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.

PMID: 28370383
DOI: 10.1002/adma.201700254

Abstract

A new acceptor-donor-acceptor-structured nonfullerene acceptor ITCC (3,9-bis(4-(1,1-dicyanomethylene)-3-methylene-2-oxo-cyclopenta[b]thiophen)-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d':2,3-d']-s-indaceno[1,2-b:5,6-b']-dithiophene) is designed and synthesized via simple end-group modification. ITCC shows improved electron-transport properties and a high-lying lowest unoccupied molecular orbital level. A power conversion efficiency of 11.4% with an impressive V _OC of over 1 V is recorded in photovoltaic devices, suggesting that ITCC has great potential for applications in tandem organic solar cells.

Keywords: end-group modification; intermolecular π-π stacking; molecular energy levels; nonfullerene acceptors; organic solar cells.