講演情報
[18a-A41-11]Physical vapor co-deposition of lead-free halide perovskite CsSn1−xZnxBr3 and fabrication of inverted solar cell
〇(D)Hanbo Jung1, Zihao Liu1, Masato Sotome2, Kazutero Nonomura2, Gaurav Kapil3, Shuji Hayase3, Takashi Kondo1,2 (1.School of Eng., Univ. of Tokyo, 2.RCAST, Univ. of Tokyo, 3.Univ. of Electro-Communications)
キーワード:
Tin halide perovskite solar cells、New alloy、physical vapor co-deposition
Metal halide perovskites (MHPs) have gained research interest since the advent of CH3NH3PbI3 solar cells. However, lead (Pb) toxicity limits their practical application. Replacing Pb with tin (Sn) has shown promise, with Sn-based MHP solar cells, particularly CH(NH2)2SnI3, achieving power conversion efficiencies (PCEs) of 14%.However, due to poor thermal stability of organic cations in MHPs, all-inorganic perovskites like CsSnX3 (X= Cl, Br, I) are being explored as alternatives. In previous study, zinc (Zn) ions have improved the environmental stability of CsSnI3 films by acting as reducing agents. Our study successfully synthesized CsSn1−xZnxBr3 thin films with varying Zn content (x = 0, 0.01, 0.02, 0.04). We fabricated inverted solar cells [ITO/PEDOT/CsSn1-xZnxBr3/C60/BCP/Ag] and found that increasing Zn content decreases the ionization energy of the films, enhancing energy level alignment and charge extraction. The CsSn0.96Zn0.04Br3 sample showed improved performance with PCE of 2.59%, VOC of 0.35 V, JSC of 13.99 mA/cm², and a fill factor of 54%. Long-term stability tests at ambient air revealed that the CsSn0.96Zn0.04Br3 device maintained 83% of its initial PCE, outperforming previously reported CsSnBr3 solar cells.
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