Durable Organic Photovoltaics Enabled by a Morphology-Stabilizing Hole-Selective Self-Assembled Monolayer

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

  • Yiwen Wang
  • Wenlin Jiang
  • Shi-Chun Liu
  • Chieh-Ting Lin
  • Baobing Fan
  • Yanxun Li
  • Huanhuan Gao
  • Ming Liu
  • Francis R. Lin

Detail(s)

Original languageEnglish
Article number2303354
Journal / PublicationAdvanced Energy Materials
Volume14
Issue number5
Online published8 Dec 2023
Publication statusPublished - 2 Feb 2024

Abstract

Organic photovoltaics (OPVs) have recently achieved efficiencies of over 19% and are well underway toward practical applications. However, issues concerning operational stability remain a major challenge ahead of OPV commercialization. Here, when replacing the conventional hole-transporting layer PEDOT:PSS with a self-assembled monolayer of [2-(3,6-dichloro-9H-carbazol-9-yl)ethyl]phosphonic acid (3,6-Cl-2PACz) or [2-(4,5-dichloro-9H-carbazol-9-yl)ethyl]phosphonic acid (4,5-Cl-2PACz) it is found that the T80 lifetime of PM6:BTP-eC9-based devices can be improved from ~100 to ~470 and over 800 h, respectively. The power conversion efficiency is also improved from 17.29% to 18.17% and 18.67%, respectively. The improved performance and prolonged photostability in 4,5-Cl-2PACz-based devices stem from the stabilized vertical distribution of donor and acceptor components, reducing the energetic disorder and thus alleviating non-radiative recombination losses. It is further found that the surface energy of 4,5-Cl-2PACz-modified substrates stays constant under prolonged illumination due to the improved intrinsic photostability of 4,5-Cl-2PACz, supporting the robust active layer morphology. Applying 4,5-Cl-2PACz in a ternary device of PM6:BTP-eC9:L8-BO-F delivered an efficiency of 19.05% and a T80 lifetime over 1140 h. © 2023 Wiley-VCH GmbH.

Research Area(s)

  • energy losses, organic solar cells, self-assembled monolayer, stability, vertical phase distribution

Citation Format(s)

Durable Organic Photovoltaics Enabled by a Morphology-Stabilizing Hole-Selective Self-Assembled Monolayer. / Wang, Yiwen; Jiang, Wenlin; Liu, Shi-Chun et al.
In: Advanced Energy Materials, Vol. 14, No. 5, 2303354, 02.02.2024.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review