Effect of Sulfur-Rich Precursor Solution on Photovoltaic Performance of CuPbSbS3 Solar Cells

Abstract

Abstract: Owing to the excellent optoelectronic characteristics, such as high absorption coefficient and suitable bandgap, CuPbSbS₃ semiconductor materials have a wide application prospect in solar cells. In this paper, CuPbSbS₃ films were deposited in the annealing process of tube furnace through butyldithiocarbamic acid (BDCA) solution method. CuPbSbS₃ film is regulated deposited by adjusting the proportion of CS₂ in BDCA solution. The effect of the proportion of CS₂ in BDCA solution on the surface morphology and crystal structure of CuPbSbS₃ films was analyzed by scanning electron microscopy and X-ray diffractometer. The results indicate that deposited CuPbSbS₃ film exhibits good crystalline morphology by fixing the volume ratio of ethanol, n-butylamine, and carbon disulfide of 7.4∶9.6∶6. Then, solar cells with the structure of FTO/SnO₂/CuPbSbS₃/Spiro-OMeTAD/Ag were fabricated. The interfacial charge transport kinetics of CuPbSbS₃ solar cells were further investigated by Mott-Schottky curves, Nyquist impedance spectra, dark current density-voltage curves, and current-voltage curves of symmetrical devices in the dark state. The results from the above electrical measurements demonstrate that the defect recombination center density and charge transport resistance of the deposited CuPbSbS₃ films is effectively reduced, decreasing the non-radiative recombination of photogenerated carriers and improving the carrier transport ability. Finally, the CuPbSbS₃ solar cell shows a photoelectric conversion efficiency of 0.81% (a short-circuit current density of 9.08 mA·cm^-2 and an open-circuit voltage of 250 mV). The relevant research results provide an experimental basis for the fabrication of high-quality CuPbSbS₃ films.

Key words: CuPbSbS₃ film, sulfur-rich precursor solution, butyldithiocarbamic acid solution method, annealing, photoelectric conversion efficiency, solar cell

CLC Number:

TM914.4

ZHAO Ya, ZHUANG Zhong, WEI Mengyuan, JIANG Qingsong, YANG Xiao, XUN Wei, LIU Yuhao. Effect of Sulfur-Rich Precursor Solution on Photovoltaic Performance of CuPbSbS₃ Solar Cells[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(9): 1640-1647.

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Effect of Sulfur-Rich Precursor Solution on Photovoltaic Performance of CuPbSbS₃ Solar Cells

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