Performance enhancement of conjugated polymer-small molecule-non fullerene ternary organic solar cells by tuning recombination kinetics and molecular ordering

Ramakant Sharma, Hyunwoo Lee, Martin Seifrid, Vinay Gupta, Guillermo C. Bazan, Seunghyup Yoo

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

We present our study of conjugated polymer-small molecule (SM)-non-fullerene ternary organic solar cells (OSCs), which employs conjugated polymer PTB7-Th and small molecule p-DTS(FBTTh2)2 as donors and non-fullerene molecule IEICO-4F as an acceptor. It is observed that the power conversion efficiency (PCE) of ∼10.9% for PTB7-Th: p-DTS(FBTTh2)2: IEICO-4F ternary OSCs with 15 wt% of p-DTS(FBTTh2)2 SM is higher than PCE of ∼9.8% for PTB7-Th: IEICO-4F OSCs. Morphological studies confirm that the addition of p-DTS(FBTTh2)2 SM in PTB7-Th: IEICO-4F binary blend improves molecular ordering and crystallinity of PTB7-Th due to the favorable interaction with p-DTS(FBTTh2)2 thereby providing 3-D textured structures consisting of a mixture of edge-on and face-on orientations. The improved molecular ordering is shown to enhance exciton generation rate, exciton dissociation, charge collection, and to reduce charge recombination, all of which boosts the PCE.

Original languageBritish English
Pages (from-to)499-507
Number of pages9
JournalSolar Energy
Volume201
DOIs
StatePublished - 1 May 2020

Keywords

  • GIWAXS
  • IEICO-4F
  • Non-fullerene
  • p-DTS(FBTTh)
  • PTB7-Th
  • Ternary

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