journal article·2022-03-28

A–D–A–D–A-Type Oligomer versus A–D–A-Type Small Molecule: Synthesis and Advanced Effect of the D–A Repeat Unit on Morphology and Photovoltaic Properties

Hao Xia, Xiaopeng Xu, Can Qian, Jiali Guo, Jinhui Zhao, Kai Zhang, Hua Tan, Qiang Peng, Weiguo Zhu

ACS Applied Energy Materials· Volume 5· Issue 3
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Abstract

In organic solar cells (OSCs), donors have a significant impact on the performance of the cells. An appropriate structure of donor and reasonable assembly between donor and acceptor are significant factors to obtain high-efficiency OSCs. Here, an A–D–A–D–A-type oligomer of 5BDDBDT and A–D–A-type small molecule of 3BDDBDT were designed and synthesized. Their crystallinity, absorption, mobility, morphology, and photovoltaic properties were primarily investigated. It was found that 5BDDBDT exhibited better photovoltaic properties than 3BDDBDT in the nonfullerene OSCs using either ITIC or IDIC as an acceptor material. The highest power conversion efficiency (PCE) of 8.78% was achieved for the 5BDDBDT:IDIC-based OSCs, which is 1.86 times higher than that obtained for the 3BDDBDT:IDIC-based OSCs. More reasonable assembly between 5BDDBDT and IDIC caused the active layer to form a more ideal phase separation morphology, which further promoted the solar cells to exhibit better photovoltaic properties. This study demonstrated that simply increasing the D–A repeat unit to construct an oligomer is one of the effective methods to improve the photovoltaic properties of donor materials.
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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

School of Materials Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou 213164, P. R. China

Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemical Engineering, and State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, P. R. China

Funding

Major Basic Research Project of the Natural Science Foundation of the Jiangsu Higher Education Institutions · National Natural Science Foundation of China · Priority Academic Program Development of Jiangsu Higher Education Institutions · Top-notch Academic Programs Project of Jiangsu Higher Education Institutions · Research Innovation Program for Postgraduate of Jiangsu Province · Jiangsu Provincial Talents Project of High-Level Innovation and Entrepreneurship

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