TY - JOUR
T1 - Light-induced degradation of a push–pull copolymer for ITO-free organic solar cell application
AU - Tegegne, Newayemedhin A.
AU - Wendimu, Hailemariam
AU - Abdissa, Zelalem
AU - Mammo, Wendimagegn
AU - Andersson, Mats R.
AU - Hone, Fekadu Gashaw
AU - Andoshee, Dinsefa M.
AU - Olaoye, Olufemi
AU - Bosman, Gurthwin
PY - 2020/12
Y1 - 2020/12
N2 - A push–pull copolymer-P1 was successfully designed and synthesized by coupling ter-thiophene donor (D) and isoindigo acceptor (A) units by a direct arylation polycondensation method. The optical bandgap of the copolymer was 1.51 eV. The copolymer showed a weak intramolecular charge transfer due to steric hindrance between the D and A units. An ITO-free organic solar cell was fabricated based on P1 donor and PC71BM acceptor. An almost complete bleaching of absorption in less than 50 h of light exposure was found in pristine P1 film. This fast light-induced degradation is due to chain scissioning and intramolecular bond breaking within the single copolymer unit. This degradation is suppressed with the addition of PC71BM. However, the addition of a 3% v/v 1,8-diiodooctane solvent additive in the processing solvent reduces the life time of the P1:PC71BM-based active layer that the remaining absorbance decreases from 30 to 10% after 80 h of light exposure.
AB - A push–pull copolymer-P1 was successfully designed and synthesized by coupling ter-thiophene donor (D) and isoindigo acceptor (A) units by a direct arylation polycondensation method. The optical bandgap of the copolymer was 1.51 eV. The copolymer showed a weak intramolecular charge transfer due to steric hindrance between the D and A units. An ITO-free organic solar cell was fabricated based on P1 donor and PC71BM acceptor. An almost complete bleaching of absorption in less than 50 h of light exposure was found in pristine P1 film. This fast light-induced degradation is due to chain scissioning and intramolecular bond breaking within the single copolymer unit. This degradation is suppressed with the addition of PC71BM. However, the addition of a 3% v/v 1,8-diiodooctane solvent additive in the processing solvent reduces the life time of the P1:PC71BM-based active layer that the remaining absorbance decreases from 30 to 10% after 80 h of light exposure.
UR - http://www.scopus.com/inward/record.url?scp=85092767753&partnerID=8YFLogxK
U2 - 10.1007/s10854-020-04642-7
DO - 10.1007/s10854-020-04642-7
M3 - Article
AN - SCOPUS:85092767753
SN - 0957-4522
VL - 31
SP - 21303
EP - 21315
JO - Journal of Materials Science: Materials in Electronics
JF - Journal of Materials Science: Materials in Electronics
IS - 23
ER -