Over 15.7% Efficiency of Ternary Organic Solar Cells by Employing Two Compatible Acceptors with Similar LUMO Levels

Zhenghao Hu; Linqiang Yang; Wei Gao; Jinhua Gao; Chunyu Xu; Xiaoli Zhang; Zhi Wang; Weihua Tang; Chuluo Yang; Fujun Zhang

doi:10.1002/smll.202000441

Over 15.7% Efficiency of Ternary Organic Solar Cells by Employing Two Compatible Acceptors with Similar LUMO Levels

Small. 2020 Apr;16(17):e2000441. doi: 10.1002/smll.202000441. Epub 2020 Apr 3.

Authors

Zhenghao Hu¹, Linqiang Yang², Wei Gao^{3

4}, Jinhua Gao¹, Chunyu Xu¹, Xiaoli Zhang⁵, Zhi Wang¹, Weihua Tang², Chuluo Yang^{3

4}, Fujun Zhang¹

Affiliations

¹ Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing, 100044, P. R. China.
² School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, P. R. China.
³ Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
⁴ Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan, 430072, P. R. China.
⁵ State Centre for International Cooperation on Designer Low-Carbon and Environmental Materials, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China.

PMID: 32243095
DOI: 10.1002/smll.202000441

Abstract

Efficient organic solar cells (OSCs) are fabricated using polymer PM6 as donor, and IPTBO-4Cl and MF1 as acceptors. The power conversion efficiency (PCE) of IPTBO-4Cl based and MF1 based binary OSCs individually arrive to 14.94% and 12.07%, exhibiting markedly different short circuit current density (J_SC ) of 23.18 mA cm^-2 versus 17.01 mA cm^-2 , fill factor (FF) of 72.17% versus 78.18% and similar open circuit voltage (V_OC ) of 0.893 V versus 0.908 V. The two acceptors, IPTBO-4Cl and MF1, have similar lowest unoccupied molecular orbital levels, which is beneficial for efficient electron transport in the ternary active layer. The PCE of optimized ternary OSCs arrives to 15.74% by incorporating 30 wt% MF1 in acceptors, resulting from the simultaneously increased J_SC of 23.20 mA cm^-2 , V_OC of 0.897 V, and FF of 75.64% in comparison with IPTBO-4Cl based binary OSCs. The gradually increased FFs of ternary OSCs indicate the well-optimized phase separation and molecular arrangement with MF1 as morphology regulator. This work may provide a new viewpoint for selecting an appropriate third component to achieve efficient ternary OSCs from materials and photovoltaic parameters of two binary OSCs.

Keywords: compatible acceptors; morphology regulators; organic solar cells; ternary strategy.

Abstract

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