Tuning the amount of oxygen vacancies in sputter-deposited SnOx films for enhancing the performance of perovskite solar cells

Ali, Fawad and Pham, Ngoc Duy and Bradford, H. Jonathan and Khoshsirat, Nima and Ostrikov, Ken and Bell, John M and Wang, Hongxia and Tesfamichael, Tuquabo (2018) Tuning the amount of oxygen vacancies in sputter-deposited SnOx films for enhancing the performance of perovskite solar cells. ChemSusChem, 11 (18). pp. 3096-3103. ISSN 1864-5631


Abstract

This work demonstrates the effect of oxygen vacancies in SnOx thin films on the performance of perovskite solar cells. Various SnOx films with different amounts of oxygen vacancies were deposited by sputtering at different substrate temperatures (25–300 °C). The transmittance of the films decreased from 82 to 66 % with increasing deposition temperature from 25 to 300 °C. Both X-ray photoelectron spectroscopy and electron-spin resonance spectroscopy confirmed that a higher density of oxygen vacancies was created within the SnOx film at a high substrate temperature, which caused narrowing of the SnOx bandgap from 4.1 (25 °C) to 3.74 eV (250 °C). Combined ultraviolet photoelectron spectroscopy and UV/Vis spectroscopy showed an excellent conduction band position alignment between the methylammonium lead iodide perovskite layer (3.90 eV) and the SnOx electron transport layer deposited at 250 °C (3.92 eV). As a result, a significant enhancement of the open-circuit voltage from 0.82 to 1.0 V was achieved, resulting in an increase of the power conversion efficiency of the perovskite solar cells from 11 to 14 %. This research demonstrated a facile approach for controlling the amount of oxygen vacancies in SnOx thin films to achieve a desirable energy alignment with the perovskite absorber layer for enhanced device performance.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Research and Innovation Division (12 Jul 2012 -)
Faculty/School / Institute/Centre: Current - Research and Innovation Division (12 Jul 2012 -)
Date Deposited: 04 Sep 2020 01:36
Last Modified: 11 Sep 2020 02:48
Uncontrolled Keywords: band alignment; oxygen vacancies; sputtering; substrate temperature; tin oxide
Fields of Research (2008): 09 Engineering > 0999 Other Engineering > 099999 Engineering not elsewhere classified
Identification Number or DOI: https://doi.org/10.1002/cssc.201801541
URI: http://eprints.usq.edu.au/id/eprint/39347

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