journal article·2024-05-06

Regulating Crystallinity and Miscibility via Ternary Strategy Triggers Efficient All-Small-Molecule Organic Solar Cells

Yixuan Xu, Chunyan Liu, Wentao Zou, Nailiang Qiu, Xinyue Jiang, Huajun Xu, Ping Cai, Renqiang Yang, Xunchang Wang, Can Shen, Liaohui Ni, Longlong Geng, Yuanyuan Kan, Yanna Sun, Ke Gao

ACS Materials Letters· Volume 6· Issue 5
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Abstract

All-small-molecule OSCs (ASM-OSCs) have garnered significant attention for their inherent advantages, including low batch-to-batch variations and well-defined molecular structures. However, their power conversion efficiencies (PCEs) are relatively inferior, mainly imputed to the challenges in controlling active layer morphologies. Herein, FSBTSeHR, a small-molecule donor (SMD) was added to the B1:BTP-eC9 blend. FSBTSeHR exhibits high crystallinity, improving the molecular packing in the ternary blend. Furthermore, FSBTSeHR has better miscibility with the host donor B1 than with BTP-eC9, leading to a proper nanoscale phase separation morphology in the ternary active layer. The optimized active layer morphology facilitates charge transport and extraction while suppressing charge recombination in ternary devices. Transient absorption spectroscopy (TAS) reveals a rapid exciton dissociation and diffusion process in the blend of B1:FSBTSeHR:BTP-eC9, which is consistent with its improved morphology. Thus, the ternary device obtained a remarkable PCE (17.04%), which is one of the highest values in ASM-OSCs to date.
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Research context

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

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

Affiliations

Shenzhen Research Institute of Shandong University, A301 Virtual University Park in South District of Shenzhen, Shenzhen 518057, P. R. China

Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion, Science Center for Material Creation and Energy Conversion, Institute of Frontier Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Qingdao 266237, P. R. China

School of Materials Science and Engineering & Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, P. R. China

School of Chemistry, Chemical Engineering and Materials, Jining University, Qufu 273155, P. R. China

Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), School of Optoelectronic Materials & Technology, Jianghan University, Wuhan 430056, China

Shandong Provincial Key Laboratory of Monocrystalline Silicon Semiconductor Materials and Technology, College of Chemistry and Chemical Engineering, Dezhou University, Dezhou 253023, China

Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, P.R. China

Funding

National Key Research and Development Program of China · Jiangxi University of Science and Technology · Basic and Applied Basic Research Foundation of Guangdong Province · Natural Science Foundation of Guangxi Zhuang Autonomous Region · Fundamental Research Fund of Shandong University · National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Natural Science Foundation of Shandong Province · Qingdao New Energy Shandong Laboratory

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