Enhanced planar perovskite solar cells with efficiency exceeding 16% via reducing the oxygen vacancy defect state in titanium oxide electrode

Physical Chemistry Chemical Physics : PCCP
Yangyang DuJianjun Zhang

Abstract

In this work, the influence of oxygen vacancy defect (OVD) in compact titanium oxide (c-TiO2) on the performance of planar perovskite solar cells (p-PSCs) is investigated, and the possible mechanisms are also proposed. To meet our objective, anatase c-TiO2 thin films with various OVD concentrations are prepared by changing the oxygen flux during the DC magnetron sputtering process and are characterized by the intensity of defect signals in the X-ray photoelectron spectra. We conclude that abundant OVDs can trigger an obviously increased majority carrier accumulation zone at the metal oxide/perovskite interface and enhanced capacitance, thereby greatly deteriorating photogenerated carrier collection efficiency. A detailed analysis of the study results also reveals that the presence of OVD in the bulk and surface of c-TiO2 can slow down electronic carrier transport and lower its electron quasi-Fermi level under illumination, leading to the detrimental charge recombination in p-PSCs. Furthermore, we report a remarkably enhanced p-PSC efficiency via preparing c-TiO2 using high oxygen flux and subsequent ultraviolet ozone treatment. As a consequence, repeatable power conversion efficiency (PCE) is propelled to as high as 16.62%, cou...Continue Reading

References

Aug 12, 2015·The Journal of Physical Chemistry Letters·Osbel AlmoraGermà Garcia-Belmonte
Feb 20, 2014·The Journal of Physical Chemistry Letters·Emilio J Juarez-PerezIvan Mora-Sero
Jan 15, 2016·Science Advances·Dongqin BiAnders Hagfeldt
Mar 11, 2016·ACS Applied Materials & Interfaces·Xingyue ZhaoHong Lin
Jul 5, 2016·Journal of the American Chemical Society·Martin SetvinUlrike Diebold
Dec 16, 2016·The Journal of Physical Chemistry Letters·Isaac ZarazuaGermà Garcia-Belmonte

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