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Research Article

Different mechanisms of improving CH3NH3PbI3 perovskite solar cells brought by fluorinated or nitrogen doped graphdiyne

Huan Huang1,§, Bing Liu1,3,§, Dan Wang1,3, Rongli Cui1, Xihong Guo1, Ying Li1,3, Shouwei Zuo2,3, Zi Yin2,3, Huanhua Wang2, Jing Zhang2( ), Hui Yuan1, Lirong Zheng2, Baoyun Sun1( )
CAS Key Lab for Biomedical Effects of Nanomaterials & Nanosafety Institute of High Energy Physics Chinese Academy of Science Beijing 100049 China
Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China
University of Chinese Academy of Sciences Beijing 100049 China

§ Huan Huang and Bing Liu contributed equally to this work.

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Graphical Abstract

Abstract

Fluorinated and nitrogen-doped graphdiyne (F/N-GDY) have been used in the active layer of perovskite solar cells (PSCs) for the first time. The introduction of heteroatoms turns out to be an effective method for boosted solar cells performance, which increases by 32.8% and 33.0%, better than the pristine or GDY doped PSCs. The enhanced performance can be attributed firstly to the superiority of F/N-GDY originated from the unique structure and optoelectronic properties of GDY. Then, both can further reduce surface defects and improve surface and bulk crystallinity than pristine GDY. What's more, efficiency increase caused by F-GDY is mainly attributed to the improvement of fill factor (FF), while the higher short-circuit current (JSC) plays more important role by N-GDY doping. Most importantly, the detailed mechanism brought about by doping of F-GDY or N-GDY is expounded by systematical characterizations, especially the synchrotron radiation technique. Doping of F-GDY causes PbII+x and forms new Pb–F bonds between F-GDY and Pb ions. Doping of N-GDY or GDY brings about PbII-x (N-GDY doping induces more deviation than that of GDY due to the participation of imine N), improving its electron density and conductivity.

Keywords

perovskite solar cellsgraphdiynegrazing incidence X-ray diffraction (GIXRD)X-ray absorption fine structure (XAFS)synchrotron radiation technique

Electronic Supplementary Material

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Nano Research
Volume 15 Issue 1,
January 2022
Pages 573-580
DOI: 10.1007/s12274-021-3522-9
Cite this article:
Huang H, Liu B, Wang D, et al. Different mechanisms of improving CH3NH3PbI3 perovskite solar cells brought by fluorinated or nitrogen doped graphdiyne. Nano Research, 2022, 15(1): 573-580. https://doi.org/10.1007/s12274-021-3522-9
Topics:
Perovskite solar cells

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Received: 07 January 2021
Revised: 13 April 2021
Accepted: 14 April 2021
Published: 25 May 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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