Phenanthroline-carbolong interface suppress chemical interactions with active layer enabling long-time stable organic solar cells

Xue Lai,, Shiyan Chen,, Xiaoyu Gu,, Hanjian Lai,, Yunpeng Wang,, Yulin Zhu,, Hui Wang,, Jianfei Qu,, Aung Ko Ko Kyaw, Haiping Xia () and Feng He ()
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Xue Lai,: Harbin Institute of Technology
Shiyan Chen,: Southern University of Science and Technology Shenzhen
Xiaoyu Gu,: Southern University of Science and Technology
Hanjian Lai,: Southern University of Science and Technology Shenzhen
Yunpeng Wang,: Southern University of Science and Technology Shenzhen
Yulin Zhu,: Southern University of Science and Technology Shenzhen
Hui Wang,: Southern University of Science and Technology Shenzhen
Jianfei Qu,: Southern University of Science and Technology Shenzhen
Aung Ko Ko Kyaw: Southern University of Science and Technology
Haiping Xia: Southern University of Science and Technology Shenzhen
Feng He: Southern University of Science and Technology Shenzhen

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract To restrain the chemical reaction at cathode interface of organic solar cells, two cathode interfacial materials are synthesized by connecting phenanthroline with carbolong unit. Consequently, the D18:L8-BO based organic solar cell with double-phenanthroline-carbolong achieve the highest efficiency of 18.2%. Double-phenanthroline-carbolong with larger steric hindrance and stronger electron-withdrawing property confirms to suppress the interfacial reaction with norfullerene acceptor, resulting the most stable device. Double-phenanthroline-carbolong based device can sustain 80% of its initial efficiency for 2170 h in dark N2 atmosphere, 96 h under 85 oC and keep 68% initial efficiency after been illuminated for 2200 h, which are significantly better than bathocuproin based devices. Moreover, superb interfacial stability of double-phenanthroline-carbolong cathode interface enables thermal posttreatment of organic sub-cell in perovskite/organic tandem solar cells and obtained a remarkable efficiency of 21.7% with excellent thermal stability, which indicates the potentially wide application of phenanthroline-carbolong materials for stable and efficient solar device fabrications.

Date: 2023
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DOI: 10.1038/s41467-023-39223-9

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