journal article·2024-08-05

Enhancing Efficiency and Photo-Stability of Organic Solar Cells via Vertical Phase Separation Morphology Induced by Surface Modification of PEDOT:PSS with Star-Shaped Benzene-Based DFTAB Additive

Xiaokang Sun, Jie Lv, Xiaoman Ding, Chuanlin Gao, Guangye Zhang, Jinfeng Zeng, Chao Zou, Wanli Liu, Shunan Zhao, Xiaoping Ouyang, Chunming Yang, Hanlin Hu, Hu Chen

ACS Materials Letters· Volume 6· Issue 8
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Abstract

As a hole transport layer in organic solar cells (OSCs), many efforts have focused on modifying PEDOT:PSS to augment its hole transport capability. In contrast, instances of utilizing organic molecules are relatively scarce, primarily due to the challenges associated with interface regulation compatibility. Herein, we present a novel approach involving the integration of 3,6-difluoro-octakis(4-methoxyphenyl) benzene-1,2,4,5-tetraamine (DFTAB), featuring star-shaped benzene moieties with an electron-poor core deeply enveloped within electron-rich surroundings. This distinctive molecular architecture prompts a transition from homogeneous to a face-on orientation feature, inducing a distinct vertical phase separation, and enhances crystallization within the active layer. Utilizing DFTAB modification, a remarkable power conversion efficiency (PCE) of 19.14% was yielded based on the PM6:ITOA:BTP-eC9 ternary device. Additionally, it enhanced the photostability of the device, benefiting from the UV absorption capacity of DFTAB. This synergistic enhancement in efficiency and stability underscores the potential of DFTAB-modified PEDOT:PSS as a promising avenue for advancing OSCs.
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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 Physical Sciences, Great Bay University, Dongguan 523000, China

Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic, 7098 Liuxian Boulevard, Shenzhen 518055, China

School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China

Great Bay Institute for Advanced Study, Dongguan 523000, China

Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, P. R. China

University of Chinese Academy of Sciences, Beijing 100049, P. R. China

College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, P. R. China

Functional Coordination Material Group-Frontier Research Center, Songshan Lake Materials Laboratory, Dongguan 523808, Guangdong, P. R. China

Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China

Funding

Basic and Applied Basic Research Foundation of Guangdong Province · Songshan Lake Materials Laboratory · China Postdoctoral Science Foundation · Science, Technology and Innovation Commission of Shenzhen Municipality · Shenzhen Polytechnic · National Natural Science Foundation of China · Dongguan Science and Technology of Social Development Program · Innovation Team Project of Guangdong

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