Stepwise heating in Stille polycondensation toward no batch-to-batch variations in polymer solar cell performance.

Citation data:

Nature communications, ISSN: 2041-1723, Vol: 9, Issue: 1, Page: 1867

Publication Year:
2018
Captures 17
Readers 17
Citations 2
Citation Indexes 2
Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/23999
PMID:
29760443
DOI:
10.1038/s41467-018-03718-7
Author(s):
Lee, Sang Myeon; Park, Kwang Hyun; Jung, Seungon; Park, Hyesung; Yang, Changduk
Publisher(s):
Springer Nature; NATURE PUBLISHING GROUP
Tags:
Chemistry; Biochemistry, Genetics and Molecular Biology; Physics and Astronomy
article description
For a given π-conjugated polymer, the batch-to-batch variations in molecular weight (M) and polydispersity index (Ð) can lead to inconsistent process-dependent material properties and consequent performance variations in the device application. Using a stepwise-heating protocol in the Stille polycondensation in conjunction with optimized processing, we obtained an ultrahigh-quality PTB7 polymer having high M and very narrow Ð. The resulting ultrahigh-quality polymer-based solar cells demonstrate up to 9.97% power conversion efficiencies (PCEs), which is over 24% enhancement from the control devices fabricated with commercially available PTB7. Moreover, we observe almost negligible batch-to-batch variations in the overall PCE values from ultrahigh-quality polymer-based devices. The proposed stepwise polymerization demonstrates a facile and effective strategy for synthesizing high-quality semiconducting polymers that can significantly improve device yield in polymer-based solar cells, an important factor for the commercialization of organic solar cells, by mitigating device-to-device variations.