Issue 12, 2018

Fullerene derivative anchored SnO2 for high-performance perovskite solar cells

Abstract

A fullerene derivative, 9-(1-(6-(3,5-bis(hydroxymethyl)phenoxy)-1-hexyl)-1H-1,2,3-triazol-4-yl)-1-nonyl [60]fullerenoacetate (C9), is employed to anchor the surface of a SnO2 electron transport layer (ETL) in planar heterojunction perovskite solar cells (PSCs). C9 suppresses charge recombination due to efficient passivation of oxygen-vacancy-related defects on the surface of the SnO2 ETL through the formation of a Lewis adduct between the under-coordinated Sn in SnO2 and hydroxyl terminal groups in C9. The C9 modifying layer enhances the extraction of photogenerated charge carriers due to the negligible injection barrier and strong electron affinity. C9 can also improve the quality of the perovskite film with enlarged grain size, reduced grain boundary and improved crystallinity. The PSCs based on C9-modified SnO2 exhibit improved photovoltaic performance with efficiency up to 21.3% with negligible hysteresis, which is superior to the control devices based on bare SnO2 (20.0%). Moreover, the ambient, photo and electric-field stability of the modified devices is also enhanced.

Graphical abstract: Fullerene derivative anchored SnO2 for high-performance perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
26 Jul 2018
Accepted
28 Sep 2018
First published
29 Sep 2018

Energy Environ. Sci., 2018,11, 3463-3471

Fullerene derivative anchored SnO2 for high-performance perovskite solar cells

K. Liu, S. Chen, J. Wu, H. Zhang, M. Qin, X. Lu, Y. Tu, Q. Meng and X. Zhan, Energy Environ. Sci., 2018, 11, 3463 DOI: 10.1039/C8EE02172D

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