Issue 47, 2014

Highly efficient imide functionalized pyrrolo[3,4-c]pyrrole-1,3-dione-based random copolymer containing thieno[3,4-c]pyrrole-4,6-dione and benzodithiophene for simple structured polymer solar cells

Abstract

As an effort to improve the photovoltaic properties of a highly efficient large band gap (2.11 eV) alternating copolymer, P(BDT-TDPPDT), comprised of electron rich benzodithiophene (BDT) and novel electron accepting pyrrole-based imide functionalized 4,6-bis(thiophen-2-yl)-2,5-dioctylpyrrolo[3,4-c]pyrrole-1,3-dione (TDPPDT) derivatives, we incorporated a relatively strong electron accepting thiophene-based imide functionalized thieno[3,4-c]pyrrole-4,6-dione (TPD) unit in its main chain via random copolymerization between BDT, TDPPDT and TPD units to give polymer P1. The incorporation of a TPD unit resulted in significant improvement in the optoelectrical and photovoltaic properties. P1 exhibits lower optical band gap (1.91 eV) and a deeper lowest unoccupied molecular orbital (LUMO) energy level compared to those of P(BDT-TDPPDT). The hole mobility of P1 was 3.66 × 10−4 cm2 V−1 s−1 and the PSC made with a simple device structure of ITO/PEDOT:PSS/P1:PC70BM(1 : 2.25 wt%) + 3 vol%/Al gave a maximum power conversion efficiency (PCE) of 7.03% with high photovoltaic parameters, such as an open-circuit voltage (Voc) of 0.87 V, a short-circuit current (Jsc) of 11.52 mA cm−2 and a fill factor (FF) of 70%. Interestingly, P1-based PSCs exhibited a high incident photon to current efficiency (IPCE) of a maximum of 78% at 410 nm and a more than 70% response between 370–590 nm. The PCE achieved in this study is the highest value reported thus far among PSCs made with random copolymers.

Graphical abstract: Highly efficient imide functionalized pyrrolo[3,4-c]pyrrole-1,3-dione-based random copolymer containing thieno[3,4-c]pyrrole-4,6-dione and benzodithiophene for simple structured polymer solar cells

Article information

Article type
Paper
Submitted
25 Sep 2014
Accepted
13 Oct 2014
First published
13 Oct 2014

J. Mater. Chem. A, 2014,2, 20126-20132

Author version available

Highly efficient imide functionalized pyrrolo[3,4-c]pyrrole-1,3-dione-based random copolymer containing thieno[3,4-c]pyrrole-4,6-dione and benzodithiophene for simple structured polymer solar cells

V. Tamilavan, K. H. Roh, R. Agneeswari, D. Y. Lee, S. Cho, Y. Jin, S. H. Park and M. H. Hyun, J. Mater. Chem. A, 2014, 2, 20126 DOI: 10.1039/C4TA05086J

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