[18a-A41-1~11] 12.5 Organic and hybrid solar cells

11:45 AM - 12:00 PM JST(2:45 AM - 3:00 AM UTC)English Presentation

[18a-A41-11] Physical vapor co-deposition of lead-free halide perovskite CsSn_1−xZn_xBr₃ and fabrication of inverted solar cell

〇(D)Hanbo Jung¹, Zihao Liu¹, Masato Sotome², Kazutero Nonomura², Gaurav Kapil³, Shuji Hayase³, Takashi Kondo^1,2 (1.School of Eng., Univ. of Tokyo, 2.RCAST, Univ. of Tokyo, 3.Univ. of Electro-Communications)

Keywords:

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 CsSn_1−xZn_xBr₃ thin films with varying Zn content (x = 0, 0.01, 0.02, 0.04). We fabricated inverted solar cells [ITO/PEDOT/CsSn_1-xZn_xBr₃/C₆₀/BCP/Ag] and found that increasing Zn content decreases the ionization energy of the films, enhancing energy level alignment and charge extraction. The CsSn_0.96Zn_0.04Br₃ sample showed improved performance with PCE of 2.59%, V_OC of 0.35 V, J_SC of 13.99 mA/cm², and a fill factor of 54%. Long-term stability tests at ambient air revealed that the CsSn_0.96Zn_0.04Br₃ device maintained 83% of its initial PCE, outperforming previously reported CsSnBr₃ solar cells.