Chemical Research in Chinese Universities ›› 2021, Vol. 37 ›› Issue (6): 1309-1316.doi: 10.1007/s40242-021-1340-y

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Graphdiyne Oxide Modified NiOx for Enhanced Charge Extraction in Inverted Planar MAPbI3 Perovskite Solar Cells

TANG Jin1,2, ZHAO Min1, CAI Xu1, LIU Le1, LI Xiaofang2, JIU Tonggang1   

  1. 1. Science Center for Material Creation and Energy Conversion, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao 266237, P. R. China;
    2. Key Laboratory of Theoretical Organic Chemistry and Functional Molecules, Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
  • Received:2020-08-29 Revised:2020-09-18 Online:2021-11-23 Published:2021-11-23
  • Contact: JIU Tonggang E-mail:tgjiu@sdu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No.21975273), the Scientific Research Starting Foundation of Outstanding Young Scholar of Shandong University, China, and the Fundamental Research Funds of Shandong University, China.

Abstract: The interface defects and nickel vacancies of the NiOx lead to interface charge recombination, which limits its application in perovskite solar cells. Here, graphdiyne oxide(GDYO) was added to NiOx as an inorganic hole transporting material. It is found that the average carrier lifetime declined from 29.2 ns to 5.4 ns and the recombination resistance increased significantly after the GDYO adding determined by the time-resolved photoluminescence and electrochemical impedance spectroscopy analysis. We further demonstrated that the GDYO adding to NiOx effectively improved the charge extraction, accelerated the charge transportation and suppressed the charge recombination. Consequently, the optimized NiOx(GDYO)-based cell showed superior performance with a higher fill factor(81.99%) and improved stability with respect to the reference device. This method provides a new method for property regulation of NiOx in inverted planar MAPbI3 perovskite solar cells.

Key words: Graphdiyne oxide, Nickel oxide, MAPbI3 perovskite solar cell, Charge extraction