期刊
ELECTROCHIMICA ACTA
卷 358, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136883
关键词
Carbon-based PSCs; ZIF-67; Co-NC(HCl) composite; Interface improvement
资金
- key laboratory open project of Xinjiang Uighur Autonomous Region [2019D04006]
- National Natural Science Foundation of China [51662037]
Hole transporting material (HTM)-free carbon-based perovskite solar cells (C-PSCs) have been regarded as one of the most promising solar cell systems owing to their superior long-term stability and low cost. However, using commercial conductive carbon (CC) paste to prepare carbon electrode (CE) usually leads to a large number of defects at the perovskite/CE interface, often resulting in a low fill factor (FF) and poor photoelectric conversion efficiency (PCE). In this paper, by pyrolyzing ZIF-67 and etching with HCl, the Co-NC(HCl) composite with a large specific surface area are prepared. Combining this material with CC paste in different proportions, a series of HTM-free PSCs structured as FTO/SnO2/perovskite/CE are fabricated. Our experimental results demonstrate that the incorporation of Co-NC(HCl) composite efficiently improves interface performance of perovskite/CE, suppresses charge recombination and promotes hole extraction, consequently enhancing the photovoltaic performance of the C-PSC. In particular, the maximum PCE of 10.72% has been achieved in the ambient atmosphere, achieving 43% increasing over the pure CC-based device. The improved performance can be attributed to the significant effect of morphological structure of Co-NC(HCl) composite and the synergistic effect of Co-N co-doping on the performance of C-PSCs. (C) 2020 Elsevier Ltd. All rights reserved.
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