Precisely Controlling the Position of Bromine on the End Group Enables Well-Regular Polymer Acceptors for All-Polymer Solar Cells with Efficiencies over 15.
all-polymer solar cells
isomeric end groups
polymer acceptors
power conversion efficiency
small-molecule acceptors
Journal
Advanced materials (Deerfield Beach, Fla.)
ISSN: 1521-4095
Titre abrégé: Adv Mater
Pays: Germany
ID NLM: 9885358
Informations de publication
Date de publication:
Dec 2020
Dec 2020
Historique:
received:
31
08
2020
revised:
24
09
2020
pubmed:
30
10
2020
medline:
30
10
2020
entrez:
29
10
2020
Statut:
ppublish
Résumé
Recent advances in the development of polymerized A-D-A-type small-molecule acceptors (SMAs) have promoted the power conversion efficiency (PCE) of all-polymer solar cells (all-PSCs) over 13%. However, the monomer of an SMA typically consists of a mixture of three isomers due to the regio-isomeric brominated end groups (IC-Br(in) and IC-Br(out)). In this work, the two isomeric end groups are successfully separated, the regioisomeric issue is solved, and three polymer acceptors, named PY-IT, PY-OT, and PY-IOT, are developed, where PY-IOT is a random terpolymer with the same ratio of the two acceptors. Interestingly, from PY-OT, PY-IOT to PY-IT, the absorption edge gradually redshifts and electron mobility progressively increases. Theory calculation indicates that the LUMOs are distributed on the entire molecular backbone of PY-IT, contributing to the enhanced electron transport. Consequently, the PM6:PY-IT system achieves an excellent PCE of 15.05%, significantly higher than those for PY-OT (10.04%) and PY-IOT (12.12%). Morphological and device characterization reveals that the highest PCE for the PY-IT-based device is the fruit of enhanced absorption, more balanced charge transport, and favorable morphology. This work demonstrates that the site of polymerization on SMAs strongly affects device performance, offering insights into the development of efficient polymer acceptors for all-PSCs.
Identifiants
pubmed: 33118246
doi: 10.1002/adma.202005942
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e2005942Subventions
Organisme : National Natural Science Foundation of China
ID : 21572171
Organisme : Innovative Research Group of Hubei Province
ID : 2015CFA014
Organisme : National Key Research and Development Program of China
ID : 2019YFA0705900
Organisme : MOST
Organisme : Hong Kong Research Grants Council
ID : R6021-18
Organisme : Hong Kong Research Grants Council
ID : 16305915
Organisme : Hong Kong Research Grants Council
ID : 16322416
Organisme : Hong Kong Research Grants Council
ID : 606012
Organisme : Hong Kong Research Grants Council
ID : 16303917
Informations de copyright
© 2020 Wiley-VCH GmbH.
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