Nonconjugated Terpolymer Acceptors with Two Different Fused-Ring Electron-Deficient Building Blocks for Efficient All-Polymer Solar Cells
Artikel i vetenskaplig tidskrift, 2021

The ternary polymerization strategy of incorporating different donor and acceptor units forming terpolymers as photovoltaic materials has been proven advantageous in improving power conversion efficiencies (PCEs) of polymer solar cells (PSCs). Herein, a series of low band gap nonconjugated terpolymer acceptors based on two different fused-ring electron-deficient building blocks (IDIC16 and ITIC) with adjustable photoelectric properties were developed. As the third component, ITIC building blocks with a larger π-conjugation structure, shorter solubilizing side chains, and red-shifted absorption spectrum were incorporated into an IDIC16-based nonconjugated copolymer acceptor PF1-TS4, which built up the terpolymers with two conjugated building blocks linked by flexible thioalkyl chain-thiophene segments. With the increasing ITIC content, terpolymers show gradually broadened absorption spectra and slightly down-shifted lowest unoccupied molecular orbital levels. The active layer based on terpolymer PF1-TS4-60 with a 60% ITIC unit presents more balanced hole and electron mobilities, higher photoluminescence quenching efficiency, and improved morphology compared to those based on PF1-TS4. In all-polymer solar cells (all-PSCs), PF1-TS4-60, matched with a wide band gap polymer donor PM6, achieved a similar open-circuit voltage (Voc) of 0.99 V, a dramatically increased short-circuit current density (Jsc) of 15.30 mA cm-2, and fill factor (FF) of 61.4% compared to PF1-TS4 (Voc = 0.99 V, Jsc = 11.21 mA cm-2, and FF = 55.6%). As a result, the PF1-TS4-60-based all-PSCs achieved a PCE of 9.31%, which is ∼50% higher than the PF1-TS4-based ones (6.17%). The results demonstrate a promising approach to develop high-performance nonconjugated terpolymer acceptors for efficient all-PSCs by means of ternary polymerization using two different A-D-A-structured fused-ring electron-deficient building blocks.

terpolymer

all-polymer solar cells

copolymer

nonconjugated polymer acceptor

power conversion efficiency

Författare

Wenyan Su

Jinan University

Karlstads universitet

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Qunping Fan

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Ishita Jalan

Karlstads universitet

Yufei Wang

Jinan University

Wenhong Peng

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Changzhou University

Tao Guo

Henan University of Technology

Chalmers, Kemi och kemiteknik, Tillämpad kemi

W. G. Zhu

Changzhou University

Donghong Yu

Aalborg Universitet

Sino-Danish Center for Education and Research Denmark

Lintao Hou

Jinan University

Ellen Moons

Karlstads universitet

Ergang Wang

Zhengzhou University

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Ergang Wang Group

ACS Applied Materials & Interfaces

1944-8244 (ISSN) 1944-8252 (eISSN)

Vol. 13 5 6442-6449

Ämneskategorier

Polymerkemi

Annan kemi

Den kondenserade materiens fysik

DOI

10.1021/acsami.0c17722

PubMed

33499588

Mer information

Senast uppdaterat

2021-03-03