journal article·2024-05-06

Design of Halogenated Donors for Efficient All-Small-Molecular Organic Solar Cells

Chenyang Zhang, Meijia Chang, Yuanyuan Zhang, Bin Hu, Guanghao Lu, Yun-Tao Ding, Shuiren Liu, Xuying Liu, Lingxian Meng

ACS Materials Letters· Volume 6· Issue 5
Publisher page

Abstract

Precise adjustment of the nanoscale morphology within the active layers is crucial for optimizing the photovoltaic performance of all-small-molecule organic solar cells (ASM-OSCs), and the halogen substituent strategy for photovoltaic materials plays a vital role in the development of the morphology evolution. In this work, we systematically study a series of acceptor–donor–acceptor (A-D-A) type small-molecule donors by incorporating halogenation at the thienyl benzo[1,2-b:4,5-b′]dithiophene (BDT-T) donor core unit named BSTR-F, BSTR-Cl, and BSTR-Br. Such halogenation is demonstrated to induce a significant increase in the ionization potential, i.e., deeper HOMO, and more ordered packing property. Using N3 as the acceptor, the BSTR-F-based devices achieve a power conversion efficiency (PCE) up to 15.93%, compared with the control nonhalogenated donor BSTR-H-based devices of 13.80%, indicating that the suitable halogenation strategy could effectively promote the high performance of ASM-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 Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China

School of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471023, China

Frontier Institute of Science and Technology, State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710054, China

State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Special Function Materials and Structure Design (MOE), College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China

Funding

National Postdoctoral Program for Innovative Talents · Zhengzhou University · China Postdoctoral Science Foundation · Science and Technology Department of Henan Province · National Natural Science Foundation of China · Heluo Young Scholar Program

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