Unifying Charge Generation, Recombination, and Extraction in Low‐Offset Non‐Fullerene Acceptor Organic Solar Cells

Abstract

Even though significant breakthroughs with over 18% power conversion efficiencies (PCEs) in polymer:non‐fullerene acceptor (NFA) bulk heterojunction organic solar cells (OSCs) have been achieved, not many studies have focused on acquiring a comprehensive understanding of the underlying mechanisms governing these systems. This is because it can be challenging to delineate device photophysics in polymer:NFA blends comprehensively, and even more complicated to trace the origins of the differences in device photophysics to the subtle differences in energetics and morphology. Here, a systematic study of a series of polymer:NFA blends is conducted to unify and correlate the cumulative effects of i) voltage losses, ii) charge generation efficiencies, iii) non‐geminate recombination and extraction dynamics, and iv) nuanced morphological differences with device performances. Most importantly, a deconvolution of the major loss processes in polymer:NFA blends and their connections to the complex BHJ morphology and energetics are established. An extension to advanced morphological techniques, such as solid‐state NMR (for atomic level insights on the local ordering and donor:acceptor ππ interactions) and resonant soft X‐ray scattering (for donor and acceptor interfacial area and domain spacings), provide detailed insights on how efficient charge generation, transport, and extraction processes can outweigh increased voltage losses to yield high PCEs.

Document Details

Document Type
Pub Defense Publication
Publication Date
Jun 18, 2020
Source ID
10.1002/aenm.202001203

Entities

People

  • Akchheta Karki
  • Alana L. Dixon
  • Alexander J Gillett
  • Bradley F Chmelka
  • Franz Schauer
  • Guillermo C. Bazan
  • Harald Ade
  • Jaewon Lee
  • Joachim Vollbrecht
  • Max Schrock
  • Nora Schopp
  • Philipp Selter
  • Richard Friend
  • Thuc‐quyen Nguyen
  • Vojtech Nádaždy
  • Zhengxing Peng

Organizations

  • Alexander von Humboldt Foundation
  • Chungnam National University
  • Institute of Physics
  • National Science Foundation
  • North Carolina State University
  • Office of Naval Research
  • Schlumberger (Netherlands)
  • Simons Foundation
  • Tomas Baťa University in Zlín
  • University of California, Santa Barbara
  • University of Cambridge

Tags

Readers

  • Distributed Systems and Data Platform Development
  • Materials Science and Engineering.
  • Solar Photovoltaics and Thermoelectric Devices.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster