Jump to main content
Jump to site search

Issue 74, 2017, Issue in Progress

Effects of bromination of poly(3-hexylthiophene) on the performance of bulk heterojunction solar cells

Author affiliations

Abstract

We examined the effects of delocalized π-electrons in poly(3-hexylthiophene) (P3HT) on the photovoltaic properties of a bulk heterojunction (BHJ) solar cell. The π-conjugated length of P3HT was controlled by modification of P3HT through partial bromination at the 4-position of thiophene units. We investigated correlation between the degree of P3HT bromination (2, 11, 22, 37, 66, 84, 100%) and the photovoltaic properties of Br-P3HT:phenyl-C61-butyric acid methyl ester (PCBM) BHJ solar cells. The power conversion efficiency of the 11% Br-P3HT:PCBM solar cell decreased to 56% of that of a pristine P3HT:PCBM solar cell. The main factor contributing to this decrease was lower short circuit currents. The photo absorption spectrum and the X-ray diffraction pattern of the 11% Br-P3HT film showed only slight differences to those of pristine P3HT, indicating the interchain π-stacking of the polymers was almost unaffected by the 11% bromination. These results suggest that an intrachain π-conjugation across more than 10 thiophene rings in the P3HT backbone is necessary to realize efficient charge transport in polymer domains. The 37% Br-P3HT:PCBM cell showed only weak photovoltaic properties; both inter- and intrachain delocalization of π-electrons were disturbed by bromination.

Graphical abstract: Effects of bromination of poly(3-hexylthiophene) on the performance of bulk heterojunction solar cells

Supplementary files

Article information


Submitted
06 Jul 2017
Accepted
29 Sep 2017
First published
04 Oct 2017

This article is Open Access

RSC Adv., 2017,7, 46874-46880
Article type
Paper

Effects of bromination of poly(3-hexylthiophene) on the performance of bulk heterojunction solar cells

S. Tanaka, S. K. B. Rosli, K. Takada, N. Taniai, T. Yoshitomi, H. Ando and K. Matsumoto, RSC Adv., 2017, 7, 46874 DOI: 10.1039/C7RA07454A

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, 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 commercial 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

Search articles by author

Spotlight

Advertisements