Unraveling High Reproducibility and Broad Composition Tolerance in High-Efficiency Organic Solar Cells via Sequential Deposition

Ruohua Gui, Kaihu Xian, Yu Shi, Wenqing Zhang, Jiawei Qiao, Zhen Fu, Jingjing Wang, Fengzhe Cui, Qian Wang, Vox Kalai Wong, Peng Lu, Shu Kong So, Maojie Zhang, Long Ye*, Gang Li, Xiaotao Hao*, Hang Yin*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

Abstract

The reproducibility issue is impeding the progress of commercialization in organic photovoltaic (OPV) devices, as the difficulty in precise micro-nano structure control in bulk heterojunction films, as well as the ineluctable fluctuations of molecular weight and polydispersity index in the synthetic process. Due to such intrinsic properties, the poor regioregularity significantly affects the batch-to-batch variation in performance of large-area or integrative scattered OPV devices. Seeking alternatives as compensatory strategies is expected to reduce the inevitable problem of reproducibility in the fabrication process. Herein, the application potential of a pseudo-bilayer structure in high-performance OPVs, by using the solution-processed method is thoroughly examined, and it is observed that the sequentially-deposited solar cells enjoy improve device reproducibility in addition to the power conversion efficiency (PCE) enhancement. Importantly, such desirable reproducibility in layer-by-layer structures raised from the film formation process provides new opportunities in ternary OPV devices, and an improved PCE of 18.70% can be achieved in a PM6/L8-BO:PY-IT device, where the counterpart ternary cases exhibit a decreasing trend in performance with the increasing content of PY-IT. This work illustrates the spatial effects of pseudo-bilayer OPV devices in the aspect of charge carrier transport/transfer, morphology and film formation kinetics, and provides a novel perspective to overcome the barriers to commercialization.

Original languageEnglish
Article number2302029
Number of pages9
JournalAdvanced Energy Materials
Volume13
Issue number44
Early online date8 Oct 2023
DOIs
Publication statusPublished - 24 Nov 2023

Scopus Subject Areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

User-Defined Keywords

  • device reproducibility
  • film formation mechanism
  • organic solar cells
  • sequential solution deposition

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