Structural Effect of TiO 2 on the Performance of MAPbBr 3 Solar Cells

【Author】

ZHANG Min;WANG Zeng-Hua;ZHENG Xiao-Jia;ZHANG Wen-Hua

【Institution】

Sichuan Research Center of New Materials, Institute of Chemical Materials, China Academy of Engineering Physics;Sichuan Research Center of New Materials, Institute of Chemical Materials, China Academy of Engineering Physics;Sichuan Research Center of New Materials, Institute of Chemical Materials, China Academy of Engineering Physics;Sichuan Research Center of New Materials, Institute of Chemical Materials, China Academy of Engineering Physics

【Abstract】

TiO 2 is frequently used as electron transport layer in perovskite solar cells, and its structure can directly affect the performance of MAPbBr 3 solar cells. It is necessary to investigate the structural effect of TiO 2 to further understand the working mechanism of such kind of solar cells. TiO 2 thin films with different morphology were prepared by spin coating, and MAPbBr 3 (MA=CH 3NH 3) thin films were further deposited on them through anti-solvent assisted crystallization approach. Then, energy band alignment between TiO 2 and MAPbBr 3 was characterized by X-ray photoelectron spectroscopy (XPS). According to the experimental results, TiO 2 with different morphology possessed different electronic structures and yielded different band alignment after contacting with MAPbBr 3 perovskite layer. The difference of conduction band value between TiO 2 and MAPbBr 3 can directly affect the transport and collection features of electrons, thereby governing the performance of the photovoltaic device.

【Keywords】

band alignment;XPS;MAPbBr 3;perovskite solar cell

References

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Total: 14 articles

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