Enhanced charge extraction for all-inorganic perovskite solar cells by graphene oxide quantum dots modified TiO<sub>2</sub> layer

doi:10.1007/s11705-022-2238-z

Front. Chem. Sci. Eng.

2023, Vol. 17

Issue (5) : 516-524 https://doi.org/10.1007/s11705-022-2238-z

RESEARCH ARTICLE

Enhanced charge extraction for all-inorganic perovskite solar cells by graphene oxide quantum dots modified TiO₂ layer

Yili Liu¹, Guoliang Che¹, Weizhong Cui¹, Beili Pang¹(

), Qiong Sun¹, Liyan Yu¹(

), Lifeng Dong^1,²(

)

¹. College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
². Department of Physics, Hamline University, St. Paul, MN 55104, USA

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Abstract

All-inorganic cesium lead bromide (CsPbBr₃) perovskite solar cells have been attracting growing interest due to superior performance stability and low cost. However, low light absorbance and large charge recombination at TiO₂/CsPbBr₃ interface or within CsPbBr₃ film still prevent further performance improvement. Herein, we report devices with high power conversion efficiency (9.16%) by introducing graphene oxide quantum dots (GOQDs) between TiO₂ and perovskite layers. The recombination of interfacial radiation can be effectively restrained due to enhanced charge transfer capability. GOQDs with C-rich active sites can involve in crystallization and fill within the CsPbBr₃ perovskite film as functional semiconductor additives. This work provides a promising strategy to optimize the crystallization process and boost charge extraction at the surface/interface optoelectronic properties of perovskites for high efficient and low-cost solar cells.

Keywords all inorganic perovskite solar cells graphene oxide quantum dots high performance stability

Corresponding Author(s): Beili Pang,Liyan Yu,Lifeng Dong

About author:

*These authors equally shared correspondence to this manuscript.

Online First Date: 20 February 2023 Issue Date: 28 April 2023

Cite this article:

Yili Liu,Guoliang Che,Weizhong Cui, et al. Enhanced charge extraction for all-inorganic perovskite solar cells by graphene oxide quantum dots modified TiO₂ layer[J]. Front. Chem. Sci. Eng., 2023, 17(5): 516-524.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-022-2238-z
https://academic.hep.com.cn/fcse/EN/Y2023/V17/I5/516

Scheme1 Schematic illustration for constructing a PSC device.

Fig.1 TEM images of GOQDs at (a) low and (b) high magnifications; (c) the optical properties of GOQDs (inset: photographs taken under room light and 365 nm UV light); (d) AFM image of GOQDs.

Tab.1 Photovoltaic parameters of CsPbBr₃ fabricated with or without GOQDs

Fig.2 (a) Schematic representation of a typical full device structure; (b) cross-sectional SEM image of a complete photovoltaic device; (c) the energy band alignment relative to vacuum; (d) current density-voltage curves for the best-performing solar cells.

Fig.3 (a) XRD spectra of perovskite films with various multistep solution-processes; (b) XPS of the PSCs with and without GOQDs; SEM images of perovskite film (c) without GOQDs and (d) with GOQDs.

Fig.4 (a) UV–Vis absorption spectra of CsPbBr₃ films (inset: (ahv)² versus hv plot); (b) IPCE spectra, (c) steady power output, and (d) J–V curves in dark of PSCs with and without GOQDs.

Fig.5 Long-term stability of un-encapsulated CsPbBr₃ PSCs with or without GOQDs layer.

Fig.6 The normal distribution of 62 devices fabricated with PSCs.

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