The coupling and competition of crystallization and phase separation, correlating thermodynamics and kinetics in OPV morphology and performances

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

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Author(s)

  • Zaiyu Wang
  • Ke Gao
  • Yuanyuan Kan
  • Ming Zhang
  • Chaoqun Qiu
  • Lei Zhu
  • Zhe Zhao
  • Xiaobin Peng
  • Wei Feng
  • Zhiyuan Qian
  • Xiaodan Gu
  • Ben Zhong Tang
  • Yong Cao
  • Yongming Zhang
  • Feng Liu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number332
Journal / PublicationNature Communications
Volume12
Online published12 Jan 2021
Publication statusPublished - 2021

Abstract

The active layer morphology transition of organic photovoltaics under non-equilibrium conditions are of vital importance in determining the device power conversion efficiency and stability; however, a general and unified picture on this issue has not been well addressed. Using combined in situ and ex situ morphology characterizations, morphological parameters relating to kinetics and thermodynamics of morphology evolution are extracted and studied in model systems under thermal annealing. The coupling and competition of crystallization and demixing are found to be critical in morphology evolution, phase purification and interfacial orientation. A unified model summarizing different phase diagrams and all possible kinetic routes is proposed. The current observations address the fundamental issues underlying the formation of the complex multi-length scale morphology in bulk heterojunction blends and provide useful morphology optimization guidelines for processing devices with higher efficiency and stability.

Citation Format(s)

The coupling and competition of crystallization and phase separation, correlating thermodynamics and kinetics in OPV morphology and performances. / Wang, Zaiyu; Gao, Ke; Kan, Yuanyuan; Zhang, Ming; Qiu, Chaoqun; Zhu, Lei; Zhao, Zhe; Peng, Xiaobin; Feng, Wei; Qian, Zhiyuan; Gu, Xiaodan; Jen, Alex K.-Y.; Tang, Ben Zhong; Cao, Yong; Zhang, Yongming; Liu, Feng.

In: Nature Communications, Vol. 12, 332, 2021.

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