High-Performance Ternary Organic Solar Cells with Controllable Morphology via Sequential Layer-by-Layer Deposition

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Minrun Ren
  • Guichuan Zhang
  • Zhen Chen
  • Jingyang Xiao
  • Xuechen Jiao
  • Yingping Zou
  • Yong Cao

Detail(s)

Original languageEnglish
Pages (from-to)13077-13086
Journal / PublicationACS Applied Materials and Interfaces
Volume12
Issue number11
Online published21 Feb 2020
Publication statusPublished - 18 Mar 2020
Externally publishedYes

Abstract

Ternary blending of light-harvesting materials has been proven to be a potential strategy to improve the efficiency of solution-processed organic solar cells (OSCs). However, the optimization of a ternary system is usually more complicated than that of a binary one as the morphology of conventional ternary blend films is very difficult to control, thus undermining the potential of ternary OSCs. Herein, we report a general strategy for better control of the morphology of ternary blend films composed of a polymer donor and two nonfullerene small-molecule acceptors for high-performance OSCs using the sequential layer-by-layer (LbL) deposition method. The resulting LbL films form a bicontinuous interpenetrating network structure with high crystallinity of both the donor and acceptor materials, showing efficient charge generation, transport, and collection properties. In addition, the power conversion efficiencies (PCEs) of the ternary LbL OSCs are less sensitive to the blending ratio of the third component acceptor, providing more room to optimize the device performance. As a result, optimal PCEs of over 11, 13, and 16% were achieved for the LbL OSCs composed of PffBT4T-2OD/IEICO-4F:FBR, PBDB-T-SF/IT-4F:FBR, and PM6/Y6:FBR, respectively. Our work provides useful and general guidelines for the development of more efficient ternary OSCs with better controlled morphology.

Research Area(s)

  • high performance, morphology control, nonfullerene acceptor, sequential layer-by-layer deposition, ternary organic solar cell

Citation Format(s)

High-Performance Ternary Organic Solar Cells with Controllable Morphology via Sequential Layer-by-Layer Deposition. / Ren, Minrun; Zhang, Guichuan; Chen, Zhen; Xiao, Jingyang; Jiao, Xuechen; Zou, Yingping; Yip, Hin-Lap; Cao, Yong.

In: ACS Applied Materials and Interfaces, Vol. 12, No. 11, 18.03.2020, p. 13077-13086.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review