journal article·2020-11-23

Ternary Blending Driven Molecular Reorientation of Non-Fullerene Acceptor IDIC with Backbone Order

Yiqun Xiao, Ruijie Ma, Guodong Zhou, Jingshuai Zhu, Tsz-Ki Lau, Shuixing Dai, Jeromy James Rech, Ni Zhao, Wei You, He Yan, Xiaowei Zhan, Xinhui Lu

ACS Applied Energy Materials· Volume 3· Issue 11
Publisher page

Abstract

The bulk-heterojunction morphology of organic solar cells is well recognized to be critical to the device performance and has received extensive research efforts in developing viable morphology tuning strategies. In this work, we present a morphology tuning approach for the molecular packing orientation, that is, through the ternary mixing of a donor polymer FTAZ with two distinctly oriented non-fullerene acceptors, IDIC and INIC3. By changing the incorporation concentration of INIC3, the originally bimodal oriented IDIC gradually reoriented to the dominant edge-on orientation. Remarkably, because of the strong backbone order induced from the end group π–π stacking of IDIC, ternary devices with strong edge-on order and appropriate phase separation domain sizes still exhibited good electron mobility in the out-of-plane direction. It suggests that the backbone order could bridge in-plane and out-of-plane electron transfer in the ternary devices, facilitating charge collection and suppressing bimolecular recombination.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, China

Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, China

Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States

Funding

Research Grants Council, University Grants Committee · Division of Chemical, Bioengineering, Environmental, and Transport Systems · National Natural Science Foundation of China · Chinese University of Hong Kong

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