Citation: Fei Pan, Xiaojun Li, Song Bai, Tianhao Liu, Xian Wei, Yingfen Li, Shanshan Chen, Changduk Yang, Xiwen Chen, Menglan Lv, Yongfang Li. High electron mobility fluorinated indacenodithiophene small molecule acceptors for organic solar cells[J]. Chinese Chemical Letters, ;2021, 32(3): 1257-1262. doi: 10.1016/j.cclet.2020.08.051 shu

High electron mobility fluorinated indacenodithiophene small molecule acceptors for organic solar cells

Fei Pan ^{a, 1} ,
Xiaojun Li ^{b, c, 1} ,
Song Bai ^{a, 1} ,
Tianhao Liu ^{a, d} ,
Xian Wei ^a ,
Yingfen Li ^a ,
Shanshan Chen ^{e, f} ,
Changduk Yang ^f ,
Xiwen Chen ^g ,
Menglan Lv ^{a, *,} ,
Yongfang Li ^{b, c, **,}

a.
School of Chemical Engineering, Guizhou Institute of Technology, Guiyang 550003, China
b.
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
c.
School of Chemical Science, University of Chinese Academy of Sciences, Beijing 100049, China
d.
School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China
e.
MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, CQU-NUS Renewable Energy Materials & Devices Joint Laboratory, School of Energy & Power Engineering, Chongqing University, Chongqing 400044, China
f.
Department of Energy Engineering, School of Energy and Chemical Engineering, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, South Korea
g.
Guangzhou Polyforte Chemical Technology Co. Ltd., Guangzhou 510520, China

^**

lvmenglan@git.edu.cn

liyf@iccas.ac.cn

Received Date: 15 July 2020
Revised Date: 19 August 2020
Accepted Date: 2 September 2020
Available Online: 2 September 2020

Figures(4)

Indacenodithiophene (IDT) derivatives are kinds of the most representative and widely used cores of small molecule acceptors (SMAs) in organic solar cells (OSCs). Here we systematically investigate the influence of end-group fluorination density and position on the photovoltaic properties of the IDT-based SMAs IDIC-nF (n=0, 2, 4). The absorption edge of IDIC-nF red-shifts with the π-π stacking and crystallinity improvement, and their electronic energy levels downshift with increasing n. Due to the advantages of J_sc and FF as well as acceptable V_oc, the difluorinated IDIC-2F acceptor based OSCs achieve the highest power conversion efficiency (PCE) of 13%, better than the OSC devices based on IDIC and IDIC-4F as acceptors. And the photovoltaic performance of the PTQ10: IDIC-2F OSCs is insensitive to the active layer thickness: PCE still keep high values of 12.00% and 11.46% for the devices with active layer thickness of 80 and 354nm, respectively. This work verifies that fine and delicate modulation of the SMAs molecular structure could optimize photovoltaic performance of the corresponding OSCs. Meanwhile, the thickness-insensitivity property of the OSCs has potential for large-scale and printable fabrication technology.
- Organic solar cells,
- Indacenodithiophene,
- Electron mobility,
- Fluorination,
- π-π stacking,
- Crystallinity
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