Structural Effect of TiO2 on the Performance of MAPbBr3 Solar Cells

doi:10.15541/jim20170384

Abstract

Abstract:

TiO₂ is frequently used as electron transport layer in perovskite solar cells, and its structure can directly affect the performance of MAPbBr₃solar cells. It is necessary to investigate the structural effect of TiO₂ to further understand the working mechanism of such kind solar cells. TiO₂ thin films with different morphology were prepared by spin coating, and MAPbBr₃(MA = CH₃NH₃) thin films were further deposited on it through anti-solvent assisted crystallization approach. Then, energy band alignment between TiO₂ and MAPbBr₃ were characterized by X-ray photoelectron spectroscopy (XPS). According to the experimental results, TiO₂ with different morphology possessed different electronic structures and yield different band alignment after contacting with MAPbBr₃ perovskite layer. The difference of conduction band value between TiO₂ and MAPbBr₃ can directly affect the transport and collection feature of electrons, thereby governing the performance of the photovoltaic device.

Key words: band alignment, XPS, MAPbBr3, perovskite solar cell

CLC Number:

TQ174

ZHANG Min, WANG Zeng-Hua, ZHENG Xiao-Jia, ZHANG Wen-Hua. Structural Effect of TiO₂ on the Performance of MAPbBr₃ Solar Cells[J]. Journal of Inorganic Materials, 2018, 33(2): 245-250.

Figures/Tables 5

Fig. 1 SEM images for (a) TiO2, (b) MAPbBr3 on FTO, (c) super thin MAPbBr3 on cp TiO2 and (d) super thin MAPbBr3 on mp TiO2

Fig. 2 XPS spectra for (a) cp TiO2, (b) mp TiO2, (c) MAPbBr3, (d) thin MAPbBr3 on cp TiO2 and (e) thin MAPbBr3 on mp TiO2

Fig. 3 Energy band diagram of MAPbBr3/TiO2 heterointerface obtained from XPS measurements

Table 1 Photovoltaic parameters of MAPbBr3 solar cells with different electron transport layers

Sample	V_oc/V	J_sc/(mA∙cm^-2)	FF/%	η/%
cp TiO₂	0.91	0.34	61.41	0.19
mp TiO₂	1.39	7.13	75.88	7.52

Fig. 4 Performance of the solar cells based on different electron transport layers

References 15

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Structural Effect of TiO₂ on the Performance of MAPbBr₃ Solar Cells

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