High-Efficiency All-Small-Molecule Organic Solar Cells Based on an Organic Molecule Donor with Alkylsilyl-Thienyl Conjugated Side Chains

Advanced Materials
Haijun BinYongfang Li

Abstract

Two medium-bandgap p-type organic small molecules H21 and H22 with an alkylsily-thienyl conjugated side chain on benzo[1,2-b:4,5-b']dithiophene central units are synthesized and used as donors in all-small-molecule organic solar cells (SM-OSCs) with a narrow-bandgap n-type small molecule 2,2'-((2Z,2'Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IDIC) as the acceptor. In comparison to H21 with 3-ethyl rhodanine as the terminal group, H22 with cyanoacetic acid esters as the terminal group shows blueshifted absorption, higher charge-carrier mobility and better 3D charge pathway in blend films. The power conversion efficiency (PCE) of the SM-OSCs based on H22:IDIC reaches 10.29% with a higher open-circuit voltage of 0.942 V and a higher fill factor of 71.15%. The PCE of 10.29% is among the top efficiencies of nonfullerene SM-OSCs reported in the literature to date.

References

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Citations

Jan 3, 2020·Macromolecular Rapid Communications·Kun WangYongfang Li
Oct 24, 2019·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Limin ChenYunlong Zhou
Jul 17, 2021·Physical Chemistry Chemical Physics : PCCP·Leonardo Evaristo de SousaPedro Henrique de Oliveira Neto
Jan 12, 2019·ACS Applied Materials & Interfaces·Kaili WangShirong Lu
Nov 19, 2020·The Journal of Physical Chemistry Letters·Lingyun ZhuZhixiang Wei
Jul 19, 2020·Journal of Molecular Graphics & Modelling·Abdullah S KhazaalKai Huwig

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