Blade-Coated Carbon Electrode Perovskite Solar Cells to Exceed 20% Efficiency Through Protective Buffer Layers |
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Authors: | Yaqing Li Xiayao Lu Yantao Mei Chen Dong Deepak Thrithamarassery Gangadharan Kong Liu Zhijie Wang Shengchun Qu Makhsud I. Saidaminov Weifeng Zhang Furui Tan |
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Affiliation: | 1. Key Laboratory of Photovoltaic Materials and Laboratory of Low-Dimensional Materials Science, School of Future Technology, Henan University, Zhengzhou, 450046 P. R. China;2. Department of Chemistry, Department of Electrical & Computer Engineering and Centre for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, British Columbia V8P 5C2, Victoria, 3010 Canada;3. Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083 P. R. China |
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Abstract: | Perovskite solar cells with carbon electrode have a commercial impact because of their facile scalability, low-cost, and stability. In these devices, it remains a challenge to design an efficient hole transport layer (HTL) for robust interfacing with perovskite on one side and carbon on another. Herein, an organic/inorganic double planar HTL is constructed based on polythiophene (P3HT) and nickel oxide (NiOx) nanoparticles to address the named challenge. Through adding an alkyl ammonium bromide (CTAB) modified NiOx nanoparticle layer on P3HT, the planar HTL achieves a cascade type-II energy level alignment at the perovskite/HTL interfaces and a preferential ohmic contact at NiOx/carbon electrode, which greatly benefits in charge collection while suppressing charge transfer recombination. Besides, compared with the single P3HT layer, the planar composite enables a robust interfacial contact by protecting perovskite from being corroded by carbon paste during fabrication. As a result, the blade-coated FA0.6MA0.4PbI3 perovskite solar cells (fabricated in ambient air in fume hood) with carbon electrode deliver an efficiency of 20.14%, the highest value for bladed coated carbon and perovskite solar cells, and withstand 275 h maximum power point tracking in air without encapsulation (95% efficiency retained). |
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Keywords: | blade-coatings buffer layers carbon electrodes mechanical contacts perovskite solar cells |
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