Publication date: 5th November 2025
Lead halide perovskite solar cells (LPSCs) have emerged as a promising alternative to silicon solar cells owing to their unique properties, including a high absorption coefficient, long charge carrier diffusion length, low cost, and solution-processable fabrication. Nevertheless, their practical applications are still hindered by several drawbacks such as chemical decomposition and phase segregation under ambient conditions with moisture. In particular, mobile halogen anions accelerate ion migration within the perovskite layer under operational condition of LPSCs. To avoid this limimation, lead chalcogenide (PbX, X = S and Se) layer have been adopted to passivate the interfacial defects between perovskite layer and hole transport layer (Spiro-OMeTAD). However, a systematic study for understanding how lead chalcogenide layer affect ion migration as well as their influence on the absorption and charge transport despite the formation of heterostructure band alignment.
In this study, the interfacial passivation between perovskite and hole transport layer (Spiro-OMeTAD) was controlled by incorporating lead chalcogenide (PbX, X = S, Se, and Te) quantum dots at the interface as well as the grainboundaries of perovskite. The PbX buffer layer effectively suppressed the direct interaction between the perovskite layer and the metal electrode from the high mobility of iodide ions. As a result, the incorporation of the PbX buffer layer reduced ion migration and effectively enhanced the long-term stability of LPSCs.
Keywords: lead halide perovskite, solar cells, lead chalcogenide
This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (RS-2021-NR060128).
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