Research Progress of Cs2AgBiBr6 Perovskite Solar Cell

doi:10.15541/jim20230049

Abstract

Abstract:

In recent years, organic-inorganic hybrid perovskite solar cells have received a lot of attention for their excellent performance and low manufacturing cost. However, the toxicity of lead in organic-inorganic hybrid perovskite solar cells and instability inhibits its further commercialization. Double perovskite Cs₂AgBiBr₆ possess excellent stability, low toxicity, long carrier lifetime, and small effective carrier mass, and is considered as a promising photovoltaic material. It has been applied in solar cells and displayed superior performance. However, the power conversion efficiency of Cs₂AgBiBr₆ perovskite solar cell still lags behind organic-inorganic hybrid perovskite solar cells, and its development faces various challenges. This review firstly introduces the crystal structure and the structural parameters such as tolerance factor of Cs₂AgBiBr₆. And then, the progress of thin film preparation technologies such as solution processing method, anti-solvent assisted film forming method, vapor deposition processing method, vacuum-assisted film forming method, spray-coating method are summarized, and the advantages and disadvantages of various preparation technologies are discussed. The performance optimization strategies of Cs₂AgBiBr₆ perovskite solar cells are analyzed from three aspects: element doping, additive engineering, and interface engineering (interface energy level matching and interface defect passivation), and the research progress in recent years is reviewed. Finally, the challenges faced by Cs₂AgBiBr₆ perovskite solar cells are pointed out, and future research directions are prospected from three aspects: precursor solvent engineering, bandgap engineering, and device degradation mechanism.

Key words: Cs₂AgBiBr₆, solar cell, power conversion efficiency, double perovskites, review

CLC Number:

TM914

ZHANG Lun, LYU Mei, ZHU Jun. Research Progress of Cs₂AgBiBr₆ Perovskite Solar Cell[J]. Journal of Inorganic Materials, 2023, 38(9): 1044-1054.

Figures/Tables 8

Fig. 1 (a) Crystal structure diagrams of perovskite ABX3 and (b) double perovskite A2B+B3+X6[30]

Fig. 2 Value range of τ in Eq. (3)[32]

Fig. 3 Fabrication processes of Cs2AgBiBr6 films (a) Solution processing method[19]; (b) Anti-solvent assisted film forming method[8]; (c) Vapor deposition processing method[35]; (d) Vacuum-assisted film forming method[37]; (e) Spray-coating method[38]

Fig. 4 SEM images of Cs2AgBiBr6 films deposited using (a) DMSO and (b) DMSO+DMF as precursor solvents[34] and prepared by (c) vapor deposition and (d) solution processing[36]

Fig. 5 Ion doped Cs2AgBiBr6 perovskite solar cells (a) SEM images of Cs2AgBiBr6, Cs1.99Li0.01AgBiBr6(Cs), Cs1.99Na0.01AgBiBr6(Cs-Li), Cs1.99K0.01AgBiBr6(Cs-Na), and Cs1.99Rb0.01AgBiBr6(Cs-K) films; (b) J-V curves of Cs2AgBiBr6 perovskite solar cells (w/o: Cs2AgBiBr6, w Li+: Cs1.99Li0.01AgBiBr6, w Na+: Cs1.99Na0.01AgBiBr6, w K+: Cs1.99K0.01AgBiBr6, w Rb+: Cs1.99Rb0.01AgBiBr6)[54]; (c) Band structure diagram for Cs2AgBiBr6[57]; (d) Tauc plots of Cs2AgSbxBi1-xBr6 (x=0, 0.25, 0.50, 0.75) films[58]; (e) Crystal structure diagram of Cs2AgBiBr6-2xSx; (f) UV-Vis absorption spectra with inset showing corresponding Tauc plots (right) of Cs2AgBiBr6-2xSx film[60]. Colorful figures are available on website

Fig. 6 Additive engineering optimization of Cs2AgBiBr6 films (a) Schematic illustration of MABr additive assisted Cs2AgBiBr6 crystallization process; (b) SEM images of Cs2AgBiBr6 films prepared (left) without and (right) with MABr[66]; (c) Schematic diagram of the mechanism of additive GuaSCN in the formation process of Cs2AgBiBr6 film; (d) SEM images of Cs2AgBiBr6 films prepared (left) without and (right) with GuaSCN [67]; (e) Schematic illustration of BMPyr+-Br- interaction between ionic liquid BMPyrCl and Cs2AgBiBr6 perovskite; (f) SEM images of Cs2AgBiBr6 films prepared (left) without and (right) with BMPyrCl[70]. Colorful figures are available on website

Fig. 7 Schematic diagrams of the interface energy level alignments in Cs2AgBiBr6 solar cells (a) Cu2O[71] and (b) HTL-1, HTL-2 or HTL-3[72] as hole transport layers; (c) C60/TiO2 as electron transport layers[73]

Fig. 8 Schematic diagrams of interface defect passivation in Cs2AgBiBr6 solar cells (a) PMMA[74], (b) Y-6[75] and (c) N719[76] passivating Cs2AgBiBr6/HTL interfaces; (d) MXene passivating Cs2AgBiBr6/ETL interface[77]. Colorful figures are available on website

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Research Progress of Cs₂AgBiBr₆ Perovskite Solar Cell

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