Annealing-induced phase separation in small-molecular bulk heterojunctions

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

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)2810-2816
Journal / PublicationOrganic Electronics: physics, materials, applications
Volume15
Issue number11
Publication statusPublished - Nov 2014

Abstract

Morphology optimization of donor-acceptor bulk heterojunctions at microscopic scale is critical for improving performance of organic photovoltaic devices. Here, effects of thermal annealing on phase separation processes in small-molecular bulk heterojunctions with different geometrical structures (i.e., PTCDA, TiOPc, CuPc and C60) are investigated with ultraviolet and X-ray photoemission spectroscopies. It was identified that post-annealing treatment caused the different degrees of vertical diffusions at the bulk heterojunctions, leading to non-uniform composition distributions. Variations in phase separations are mainly due to the differences in surface energy of the involved materials, which play a crucial role in the intermolecular interactions and the molecular diffusion. Low-surface-energy materials were found to segregate preferentially on the surface for minimizing total energy of the systems. © 2014 Elsevier B.V. All rights reserved.

Research Area(s)

  • Bulk heterojunction, Donor-acceptor interface, Phase separation, Self-organization, Thermal annealing

Citation Format(s)

Annealing-induced phase separation in small-molecular bulk heterojunctions. / Wei, Huai-Xin; Li, Yan-Qing; Chen, Xiang-Yu; Lee, Chun-Sing; Tang, Jian-Xin.

In: Organic Electronics: physics, materials, applications, Vol. 15, No. 11, 11.2014, p. 2810-2816.

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