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Synthesis of thiophene‐benzodithiophene wide bandgap polymer and GIWAXS evaluation of thermal annealing with potential for application in ternary polymer solar cells
Author(s) -
Rubio Arias Jose Jonathan,
Mota Isabela Custódio,
Vieira Marques Maria De Fátima
Publication year - 2021
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.5187
Subject(s) - materials science , polymer solar cell , polymer , band gap , ternary operation , thiophene , homo/lumo , annealing (glass) , chemical engineering , absorption (acoustics) , solar cell , optoelectronics , polymer chemistry , organic chemistry , composite material , chemistry , molecule , computer science , engineering , programming language
Conjugated polymers are a special type of material responsible for light absorption in polymer solar cells. The absorption of these materials plays an important role in photon harvesting and energy conversion. Ternary organic solar cells are a type of OPV that combines two‐electron donors with complementary absorption in a single layer. The present work deals with the synthesis and characterization of a high‐bandgap polymer prepared through the alternation of two high‐electron density aromatic units (thiophene‐benzodithiophene). This polymer presented high bandgap (2.1 eV) with potential for complementary absorption in a ternary device, as well as high V oc when applied in a single junction inverted OPV device in heterojunction with PC 70 BM (0.95 V), which agrees with the relatively large energy difference between its HOMO and the LUMO of PC 70 BM determined through CV and UV‐vis. A dynamic GIWAXS study was performed and demonstrated that for this polymer, increasing annealing temperature to 80°C can increase its crystalline organization by up to 50%.