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Improved efficiency and stability in polymer solar cells using a Tetra-nuclear Zinc(II) complex interfacial layer
Affiliation:1. Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (Nanjing Tech), Nanjing 211816, China;2. Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), School of Material Science and Engineering, Nanjing University of Posts & Telecommunications, Nanjing 210023, China;3. Key Laboratory for Organic Electronics & Information Displays (KLOEID), Jiangsu Engineering Centre for Plate Displays & Solid State Lighting, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, Nanjing 210023, China;1. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, China;2. Department of Polymer Science and Engineering, University of Massachusetts, Amherst, MA 01003, USA;3. Department of Chemistry, University of Massachusetts, Amherst, MA 01003, USA;4. Department of Chemical Engineering, University of Massachusetts, Amherst, MA 01003, USA;1. School of Physical Science and Technology, Southwest University, Chongqing, 400715, PR China;2. College of Science, Chongqing University of Posts and Telecommunications, Chongqing, 400065, PR China;1. Department of Information Display Engineering, Hanyang University, Seoul, 04763, South Korea;2. Department of Electronics and Computer Engineering, Hanyang University, Seoul, 04763, South Korea;1. School of Science, China University of Petroleum (East China), Qingdao, 266580, China;2. College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, China;1. College of Electrical and Information Engineering, Shaanxi University of Science and Technology, Xi''an, 710021, PR China;2. Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi''an Jiaotong University, Xi''an, 710049, PR China;3. School of Electrical Engineering, Xi''an Jiaotong University, Xi''an, 710049, PR China
Abstract:Tetra-nuclear Zinc(II) complex Zn4O(AID)6 [AID = 7-azaindolate] is a wide band gap luminescent material that exhibits efficient emission matching the absorption spectra of organic donor materials such as polythiophene (P3HT). This work demonstrates polymer solar cells (PSC) based on P3HT:PCBM (phenyl-C61-butyric acid methyl ester) blend active layer with a Zn4O(AID)6 cathode interfacial layer achieving a power conversion efficiency (PCE) significantly higher than that of the reference devices. The energy level and impedance spectroscopy analysis show that the Zn4O(AID)6 cathode interfacial layer acts as an efficient exciton/hole blocking layer, and reduces charge recombination rate with more efficient electron extraction. The Zn4O(AID)6 interfacial layer also helps achieve longer lifetime of PSC devices. The improved efficiency and stability combined with low cost and nontoxicity of Zn4O(AID)6 make it a promising cathode interfacial material for high-performance and stable PSC devices.
Keywords:Polymer solar cells  Cathode interfacial layer  Exciton/hole blocking  Power conversion efficiency
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