Thickness-dependent photovoltaic performance of TiO2 blocking layer for perovskite solar cells

In this work, organic-inorganic hybrid perovskite solar cells (PSCs) were fabricated under air atmosphere with high humidity condition around 55%. A modified method was demonstrated for forming the TiO2 blocking layers (BL-TiO2) with various thickness by spin-coating the mixed precursor solutions of...

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Bibliographic Details
Published in:Journal of alloys and compounds 2018-03, Vol.736, p.87-92
Main Authors: Liu, Huijing, Bala, Hari, Zhang, Bo, Zong, BeiBei, Huang, Liwen, Fu, Wuyou, Sun, Guang, Cao, Jianliang, Zhan, Zhanying
Format: Article
Language:English
Subjects:
Diethanolamine
Electrical impedance
Electron transport
Ethanol
Humidity
Morphology
Open circuit voltage
Perovskite
Perovskite solar cells
Photoelectric effect
Photoelectric emission
Photovoltaic cells
Photovoltaic performance
Short circuits
Solar cells
Spin coating
Thickness
TiO2 blocking layer
Titanium
Titanium oxides
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Summary:In this work, organic-inorganic hybrid perovskite solar cells (PSCs) were fabricated under air atmosphere with high humidity condition around 55%. A modified method was demonstrated for forming the TiO2 blocking layers (BL-TiO2) with various thickness by spin-coating the mixed precursor solutions of ethanol (CH3CH2OH), diethanolamine (DEA) and titanium n-butoxide (Ti(OC4H9)4) with different volume ratios (CH3CH2OH: DEA: Ti(OC4H9)4 = 24: 1: R). The thickness of BL-TiO2 increased from 16 to 54 nm with a rise of R from 1.5 to 4.0. We demonstrated that suitable thickness of BL-TiO2 was beneficial to enhancing the photovoltaic performance of PSCs. The kinetic parameter of electron transport was investigated by the electrical impedance measurements, and then the influence of BL-TiO2 thickness on electron transport performance in PSCs was further discussed. The optimized PSCs delivered a short-circuit photocurrent density (JSC) of 20.61 mA/cm3, open-circuit voltage (Voc) of 939.4 mV, fill factor of (FF) of 0.661 and overall conversion efficiency (η) of 12.80% when the thickness of BL-TiO2 was about 31 nm (R = 2.4). The photovoltaic performance of mesoporous PSCs was extremely dependent on the thickness and morphology of blocking layer. [Display omitted] •The perovskite solar cells (PSCs) was fabricated under highly humidity condition.•The quality of blocking layer (BL) affected significantly performance of the PSCs.•The modified method for blocking layers can be widely employed as a fabrication platform.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.11.081