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Design and synthesis of an amino-functionalized non-fullerene acceptor as a cathode interfacial layer for polymer solar cells

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Abstract

A novel n-type organic small-molecule semiconductor, denoted N-IDTBR, was designed and synthesized by introducing an amine group into the extensively used non-fullerene acceptor O-IDTBR. This new material can be readily dissolved in alcohol, which allowed it to be spin-cast on top of a photoactive layer by processing with an orthogonal solvent for the construction of multilayer polymer solar cells. A poly(3-hexylthiophene):O-IDTBR blend was selected as a model system, which contains N-IDTBR as the cathode interlayer. We adopted non-halogenated anisole/2-methylanisole as the processing solvent to fabricate the active layer and achieve an impressive power conversion efficiency of 6.1%. Of particular interest is the fact that the N-IDTBR functioned not only as a single cathode interfacial layer to facilitate charge collection, but it also presented slight contribution to the light-harvesting capability of the device, thus leading to enhanced current density of the resulting devices. More importantly, the PCEs of the devices remained at 5.85 ± 0.25% as the thickness of the N-IDTBR layer varied from 5 to 30 nm, which demonstrated their great potential for future practical applications.

Graphical abstract: Design and synthesis of an amino-functionalized non-fullerene acceptor as a cathode interfacial layer for polymer solar cells

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Article information


Submitted
24 Jan 2020
Accepted
27 Feb 2020
First published
28 Feb 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Design and synthesis of an amino-functionalized non-fullerene acceptor as a cathode interfacial layer for polymer solar cells

P. Luo, K. An, L. Ying, G. Li, C. Zhu, B. Fan, F. Huang and Y. Cao, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC00435A

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