Jump to main content
Jump to site search


Fluorinated D1(0.5)–A–D2(0.5)–A model terpolymer: ultrafast charge separation kinetics and electron transfer at the fluorinated D/A interface for power conversion

Author affiliations

Abstract

A model fluorinated semiconductivity terpolymer, PBTA-PS-F (D1–A–D2–A), was synthesized and used in polymer solar cells (PSCs). This terpolymer possessed optimal energy levels (HOMO and LUMO, −5.48/−3.53 eV) and a complementary absorption region with small molecule acceptor ITIC. Two-dimensional grazing incidence X-ray (2D-GIXD) studies indicated that PBTA-PS-F exhibits strong lamellar stacking and preferable face-on orientation in the pristine film and the film blended with ITIC. A large ground to excited state dipole moment Δμge of 1.84 D was calculated for PBTA-PS-F, which was larger than that of its counterpart copolymer PBTA-PS (0.27 D). Furthermore, ultrafast electron transfer at the fluorinated terpolymer D/A interface was found from the ground state bleach signature (GSB) and excited state absorption signature (ESA) signals. Therefore, a high power conversion efficiency of 13.48% was achieved for the optimized PBTA-PS-F:ITIC device. As a result, employing structurally similar donor moieties as modulators to construct D1–A–D2–A model terpolymers can be used to improve the performance of polymer solar cells.

Graphical abstract: Fluorinated D1(0.5)–A–D2(0.5)–A model terpolymer: ultrafast charge separation kinetics and electron transfer at the fluorinated D/A interface for power conversion

Back to tab navigation

Supplementary files

Article information


Submitted
25 Sep 2019
Accepted
05 Dec 2019
First published
09 Dec 2019

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

Fluorinated D1(0.5)–A–D2(0.5)–A model terpolymer: ultrafast charge separation kinetics and electron transfer at the fluorinated D/A interface for power conversion

X. Li, Z. Liang, H. Wang, S. Qiao, Z. Liu, H. Jiang, W. Chen and R. Yang, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA10610C

Social activity

Search articles by author

Spotlight

Advertisements