Structural engineering of pyrrolo[3,4-: F] benzotriazole-5,7(2 H,6 H)-dione-based polymers for non-fullerene organic solar cells with an efficiency over 12%
Artikel i vetenskaplig tidskrift, 2019

In this work, we have synthesized two wide band gap donor polymers based on benzo[1,2-b:4,5-b′]dithiophene (BDT) and pyrrolo[3,4-f]benzotriazole-5,7(2H,6H)-dione (TzBI), namely, PBDT-TzBI and PBDT-F-TzBI and studied their photovoltaic properties by blending them with ITIC as an acceptor. Polymer solar cell devices made from PBDT-TzBI:ITIC and PBDT-F-TzBI:ITIC exhibited power conversion efficiencies (PCEs) of 9.22% and 11.02% and while annealing at 160 °C, improved the device performances to 10.24% and 11.98%, respectively. Upon solvent annealing with diphenyl ether (DPE) (0.5%) and chlorobenzene (CB), the PCE of the PBDT-F-TzBI-based device increased to 12.12%. The introduction of the fluorinated benzodithiophene (BDT-F) moiety on the backbone of PBDT-F-TzBI improved the open circuit voltage, short circuit current and fill factor simultaneously. The high PCEs of the PBDT-F-TzBI:ITIC-based devices were supported by comparison and analysis of the optical and electronic properties, the charge carrier mobilities, exciton dissociation probabilities, and charge recombination behaviors of the devices.


Birhan Alkadir Abdulahi

Chalmers, Kemi och kemiteknik

Addis Ababa University

Xiaoming Li

Hebei University of Science and Technology

Mariza Mone

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

Bisrat Kiros

Addis Ababa University

Zewdneh Genene

Ambo University

Shanlin Qiao

Hebei University of Science and Technology

R. Yang

Chinese Academy of Sciences

Ergang Wang

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

W. Mammo

Addis Ababa University

Journal of Materials Chemistry A

20507488 (ISSN) 20507496 (eISSN)

Vol. 7 33 19522-19530





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