Single-junction organic solar cell containing a fluorinated heptacyclic carbazole-based ladder-type acceptor affords over 13% efficiency with solution-processed cross-linkable fullerene as an interfacial layer

Tsung Wei Chen, Chia-Chih Chang, Yu Tang Hsiao, Choon Kee Chan, Ling Hong, Lian Zhong, Wei Tsung Chuang, Jianhui Hou*, Yongfang Li, Chain-Shu Hsu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

In this article, a fluorinated heptacyclic dithienocyclopentacarbazole (DTC)-based non-fullerene acceptor (NFA), DTC(4Ph)-4FIC, is synthesized and blended with J71, PBDB-T, and PBDB-TF, featuring complementary absorption and well-matched energy levels. The DTC(4Ph)-4FIC neat film exhibits face-on preference, whereas the nonfluorinated counterpart, DTC(4Ph)-IC, exhibits edge-on preference; this unique feature owing to fluorination in DTC-based NFAs is observed for the first time. More importantly, DTC(4Ph)-4FIC exhibits improved power conversion efficiencies (PCEs) of 10.92 and 10.41% in J71- and PBDB-T-containing devices, while the devices that employed DTC(4Ph)-IC afford PCEs of 7.76 and 9.48%, respectively. Because PBDB-TF is known to exhibit lower energy levels than J71 and PBDB-T, the corresponding device affords a VOC of 0.95 V, a JSC of 18.29 mA cm-2, a FF of 75.70%, and a PCE of 13.15%, which is 20 and 26% higher than J71- and PBDB-T-containing devices. Furthermore, the inverted device containing the PBDB-TF:DTC(4Ph)-4FIC blend is fabricated using cross-linkable fullerene (C-PCBSD) as the cathode interlayer, affording a decent PCE of 13.36%, with a VOC of 0.94 V, a JSC of 20.20 mA cm-2, and a FF of 70.42%.

Original languageEnglish
Pages (from-to)31069-31077
Number of pages9
JournalACS Applied Materials and Interfaces
Volume11
Issue number34
DOIs
StatePublished - 28 Aug 2019

Keywords

  • carbazole
  • cathode interlayer
  • cross-linkable fullerene
  • fluorination effect
  • non-fullerene acceptor

Fingerprint

Dive into the research topics of 'Single-junction organic solar cell containing a fluorinated heptacyclic carbazole-based ladder-type acceptor affords over 13% efficiency with solution-processed cross-linkable fullerene as an interfacial layer'. Together they form a unique fingerprint.

Cite this