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This content will become publicly available on January 25, 2019

Title: Effect of the Molecular Configuration of Perylene Diimide Acceptors on Charge Transfer and Device Performance

Three perylene diimides (PDI)-based small molecules, T2-SePDI2, T3B-SePDI3, and T4B-SePDI4, with different molecular configurations are synthesized. Due to a large steric hindrance, the molecular configuration of T3B-SePDI3 is the most distorted, followed by T4BSePDI4, while T2-SePDI2 shows the smallest steric hindrance. Inverted bulk heterojunction solar cells based on T3B-SePDI3 and PBDB-T show the highest power conversion efficiency (PCE) of 5.82% with an open-circuit voltage of 0.98 V, a high short-circuit current density of 10.52 mA/cm2, and a fill factor of 56.31%. The PCEs of the T2-SePDI2- and T4B-SePDI4- based devices are 4.10% and 5.10%, respectively. Furthermore, the results demonstrate that the molecular configuration of the PDI-based small molecule acceptor is critical and that increasing the steric hindrance is helpful in suppressing aggregation and improving device performance.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ; ORCiD logo [1] ; ORCiD logo [3] ; ORCiD logo [1]
  1. Southern Univ. of Science and Technology, Shenzhen (People's Republic of China)
  2. Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, P. R. China
  3. Argonne National Lab. (ANL), Lemont, IL (United States); The Univ. of Chicago, Chicago, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
ACS Applied Energy Materials
Additional Journal Information:
Journal Volume: 1; Journal Issue: 2; Journal ID: ISSN 2574-0962
Publisher:
American Chemical Society (ACS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NNSFC)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; charge transfer; molecular configuration; non-fullerene acceptor; organic solar cells; perylene diimides; steric hindrance
OSTI Identifier:
1440754