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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

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Front. Chem. Sci. Eng.    2021, Vol. 15 Issue (1) : 180-186    https://doi.org/10.1007/s11705-020-1917-x
RESEARCH ARTICLE
Spray-coated SnO2 electron transport layer with high uniformity for planar perovskite solar cells
Yaqin Wang1, Lin Yang1, Chunxiang Dall’Agnese1, Gang Chen1, Ai-Jun Li2(), Xiao-Feng Wang1()
1. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, China
2. College of Physics, Jilin University, Changchun 130012, China
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Abstract

SnO2 has been proven to be an effective electron transport layer (ETL) material for perovskite solar cells (PSCs) owing to its excellent electrical and optical properties. Here, we introduce a viable spray coating method for the preparation of SnO2 films. Then, we employ a SnO2 film prepared using the spray coating method as an ETL for PSCs. The PSC based on the spray-coated SnO2 ETL achieves a power conversion efficiency of 17.78%, which is comparable to that of PSCs based on conventional spin-coated SnO2 films. The large-area SnO2 films prepared by spray coating exhibit good repeatability for device performance. This study shows that SnO2 films prepared by spray coating can be applied as ETLs for stable and high-efficiency PSCs. Because the proposed method involves low material consumption, it enables the low-cost and large-scale production of PSCs.
Keywords spray coating      SnO2 film      ETL      PSCs     
Corresponding Author(s): Ai-Jun Li,Xiao-Feng Wang   
Online First Date: 16 March 2020    Issue Date: 12 January 2021
 Cite this article:   
Yaqin Wang,Lin Yang,Chunxiang Dall’Agnese, et al. Spray-coated SnO2 electron transport layer with high uniformity for planar perovskite solar cells[J]. Front. Chem. Sci. Eng., 2021, 15(1): 180-186.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-020-1917-x
https://academic.hep.com.cn/fcse/EN/Y2021/V15/I1/180
Fig.1  SEM images of SnO2 films prepared by (a) spray coating and (b) spin coating.
Fig.2  AFM images of SnO2 films prepared by (a,b) spray coating and (c,d) spin coating.
Fig.3  XRD patterns of perovskite films deposited on SnO2 films prepared by different methods.
Fig.4  J-V curves of PSCs based on SnO2 prepared at different spraying times.
Spraying time/s Jsc/(mA·cm?2) Voc/V FF PCE/% Rs/W
10 21.61±0.35 1.134±0.009 0.592±0.025 15.42±0.50 240
20 23.35±0.50 1.144±0.010 0.666±0.030 17.78±0.42 156
30 21.69±0.45 1.159±0.011 0.642±0.028 16.14±0.39 196
40 22.03±0.48 1.145±0.011 0.616±0.035 15.73±0.56 233
50 22.51±0.45 1.143±0.010 0.559±0.040 14.37±0.58 266
Tab.1  Photovoltaic parameters of devices based on SnO2 prepared at different spraying times
Fig.5  (a) J-V curves and (b) EQE of PSCs based on SnO2 prepared by spin coating and spray coating.
Item Jsc/(mA·cm−2) Voc/V FF PCE/% Rs/W
Spin coating 22.80±0.48 1.156±0.010 0.679±0.030 17.90±0.39 160
Spray coating 23.35±0.50 1.144±0.010 0.666±0.030 17.78±0.42 156
Tab.2  Photovoltaic parameters of PSCs based on SnO2 prepared by spin coating and spray coating for 20 s
Fig.6  Stability test of devices without any encapsulation.
Fig.7  PCEs of twelve PSCs based on the same batch of spray-coated SnO2 films under the same conditions.
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