The effect of molecular geometry on the photovoltaic property of diketopyrrolopyrrole based non-fullerene acceptors

Fei Zhang, Rasmus Guldbæk Brandt, Zhuowei Gu, Shasha Wu, Thomas Rieks Andersen, Minmin Shi, Donghong Yu, Hongzheng Chen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The non-fullerene acceptors with different geometric structures have great impact on light absorption, exciton dissociation, and charge transportation in the active layer of organic solar cells (OSCs). In this paper, we designed and synthesized two diketopyrrolopyrrole based non-fullerene acceptors, Ph(DPP)2 and PhDMe(DPP)2 with similar chemical components but different molecular geometries. Due to its more twisted molecular conformation, PhDMe(DPP)2 shows more blue-shifted absorption bands, higher electron mobility, and better miscibility with the polymer donor poly(3-hexylthiophene) (P3HT) while compared to Ph(DPP)2. Therefore, the resulting P3HT:PhDMe(DPP)2 based OSCs shows a better power conversion efficiency (PCE) of 0.65%, higher than that from P3HT:Ph(DPP)2 based OSCs (0.48%), which can be ascribed to more efficient exciton dissociation and electron transportation in the active layer of P3HT:PhDMe(DPP)2.
Original languageEnglish
JournalSynthetic Metals
Volume203
Pages (from-to)249-254
Number of pages6
ISSN0379-6779
DOIs
Publication statusPublished - 2015

Keywords

  • Diketopyrrolopyrrole
  • Geometric structure
  • Non-fullerene acceptors
  • Organic solar cells
  • Dissociation
  • Electromagnetic wave absorption
  • Excitons
  • Fullerenes
  • Light absorption
  • Molecular structure
  • Photovoltaic effects
  • Solar cells
  • Diketopyrrolopyrroles
  • Electron transportation
  • Molecular conformation
  • Organic solar cell
  • Photovoltaic property
  • Power conversion efficiencies
  • Geometry

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