Issue 9, 2020

The effect of aggregation behavior on photovoltaic performances in benzodithiophene-thiazolothiazole-based wide band-gap conjugated polymers with side chain position changes

Abstract

Two conjugated donor polymers (PBTz-1 and PBTz-2) based on benzo[1,2-b:4,5-b′]dithiophene and thiazolothiazole (TzTz) with different side chain (2-hexyldecyl) positions were designed and synthesized. Both polymers had similar optical and electrochemical bandgaps as well as deep HOMO levels, but significantly different aggregation behaviors in solution and photovoltaic performances in NF PSCs. Combining their absorption spectra, atomic force microscopy and X-ray diffraction measurements, we found that PBTz-1 exhibited stronger aggregation in solution and crystallization in film than PBTz-2. When they were blended with a non-fullerene acceptor (IT-4F), their blend films showed large differences in organizations and morphologies. In PSCs, the power conversion efficiency (PCE) of the PBTz-1:IT-4F-based PSC was only 6.2%, while the PCE of the PBTz-2:IT-4F-based PSC was up to 12.4%.

Graphical abstract: The effect of aggregation behavior on photovoltaic performances in benzodithiophene-thiazolothiazole-based wide band-gap conjugated polymers with side chain position changes

Supplementary files

Article information

Article type
Paper
Submitted
24 sep 2019
Accepted
24 dec 2019
First published
26 dec 2019

Polym. Chem., 2020,11, 1629-1636

The effect of aggregation behavior on photovoltaic performances in benzodithiophene-thiazolothiazole-based wide band-gap conjugated polymers with side chain position changes

P. Wan, C. An, T. Zhang, K. Ma, N. Liang, Y. Xu, S. Zhang, B. Xu, J. Zhang and J. Hou, Polym. Chem., 2020, 11, 1629 DOI: 10.1039/C9PY01438A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements