TY - JOUR
T1 - High-performing random terpolymer-based nonfullerene polymer solar cells fabricated using solvent additive-free as-cast blend films
AU - Hoang, Mai Ha
AU - Park, Gi Eun
AU - Phan, Dinh Long
AU - Ngo, Trinh Tung
AU - Nguyen, Tuyen Van
AU - Park, Su Hong
AU - Cho, Min Ju
AU - Choi, Dong Hoon
N1 - Funding Information:
This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 104.02–2015.89. This research was also supported by the National Research Foundation of Korea (NRF20100020209). Authors are grateful to Pohang Accelerator Laboratory (Pohang, Korea) for allowing us to conduct the grazing incidence wide angle X-ray scattering (GIWAXS) measurements.
Publisher Copyright:
© 2018 Wiley Periodicals, Inc.
PY - 2018/7/15
Y1 - 2018/7/15
N2 - Two new random terpolymers containing 4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene (BDT) as a donating unit, methyl-3-thiophenecarboxylate (3MT) as a weak accepting unit, and the more electron-deficient benzo[c][1,2,5]thiadiazole (BTz) or 5,5′-bis(2-ethylhexyl)-4H,4′H-1,1′-bithieno[3,4-c]pyrrole-4,4′,6,6′(5H,5′H)-tetraone (BiTPD) unit as a third monomer (respectively yielding 3MTB and 3MTT) were synthesized in order to achieve improved physical and optoelectronic properties relative to the 3MT-Th copolymer bearing only BDT and 3MT. The UV–vis absorption spectra and optical bandgap energies of these terpolymers were broader and smaller than those of the 3MT-Th copolymer. In thin films, the terpolymers displayed the face-on polymer chain orientation, indicating that the BTz or BiTPD unit in the terpolymer backbones did not affect the molecular arrangement on the substrate. In comparison with 3MT-Th-based polymer solar cells (PSCs) as control devices, the PSCs employing blend films of these terpolymers as the donor and 2,2′-[[6,6,12,12-Tetrakis(4-hexylphenyl)-6,12-dihydrodithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene-2,8-diyl]bis[methylidyne(3-oxo-1H-indene-2,1(3H)-diylidene)]]bis[propanedinitrile] (ITIC) as the acceptor exhibited higher power conversion efficiencies (>8.0%) for the same device configuration. In addition, the 3MTB- and 3MTT-based PSC devices displayed excellent shelf-life even after aging for over 1000 h.
AB - Two new random terpolymers containing 4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene (BDT) as a donating unit, methyl-3-thiophenecarboxylate (3MT) as a weak accepting unit, and the more electron-deficient benzo[c][1,2,5]thiadiazole (BTz) or 5,5′-bis(2-ethylhexyl)-4H,4′H-1,1′-bithieno[3,4-c]pyrrole-4,4′,6,6′(5H,5′H)-tetraone (BiTPD) unit as a third monomer (respectively yielding 3MTB and 3MTT) were synthesized in order to achieve improved physical and optoelectronic properties relative to the 3MT-Th copolymer bearing only BDT and 3MT. The UV–vis absorption spectra and optical bandgap energies of these terpolymers were broader and smaller than those of the 3MT-Th copolymer. In thin films, the terpolymers displayed the face-on polymer chain orientation, indicating that the BTz or BiTPD unit in the terpolymer backbones did not affect the molecular arrangement on the substrate. In comparison with 3MT-Th-based polymer solar cells (PSCs) as control devices, the PSCs employing blend films of these terpolymers as the donor and 2,2′-[[6,6,12,12-Tetrakis(4-hexylphenyl)-6,12-dihydrodithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene-2,8-diyl]bis[methylidyne(3-oxo-1H-indene-2,1(3H)-diylidene)]]bis[propanedinitrile] (ITIC) as the acceptor exhibited higher power conversion efficiencies (>8.0%) for the same device configuration. In addition, the 3MTB- and 3MTT-based PSC devices displayed excellent shelf-life even after aging for over 1000 h.
KW - high stability
KW - miscibility
KW - morphology
KW - polymer solar cell
KW - random terpolymer
KW - spin coating
UR - http://www.scopus.com/inward/record.url?scp=85048310661&partnerID=8YFLogxK
U2 - 10.1002/pola.29034
DO - 10.1002/pola.29034
M3 - Article
AN - SCOPUS:85048310661
VL - 56
SP - 1528
EP - 1535
JO - Journal of Polymer Science, Part A: Polymer Chemistry
JF - Journal of Polymer Science, Part A: Polymer Chemistry
SN - 0887-624X
IS - 14
ER -