[18p-P09-1~54] 12.5 Organic and hybrid solar cells

English Presentation

[18p-P09-16] Influence of Excess Tin (II) Iodide on Photovoltaic Performance of 1.4 eV Wide Bandgap Sn-Pb Perovskite Solar Cells

〇(P)Suraya Shaban¹, Kapil Gaurav¹, Shahrir Sahamir¹, Safalmani Pradhan¹, Shuzi Hayase¹ (1.UEC-Tokyo)

Keywords:

perovskite Solar cells,tin-lead perovskite,wide-bandgap

Perovskite solar cells (PSCs) have emerged as promising candidates for next-generation photovoltaic technology due to their high efficiency potential and relatively low production costs. Among various compositions, tin-lead (Sn-Pb) mixed perovskites offer a compelling balance of optical and electronic properties, especially when engineered with a wide bandgap of 1.4 eV. This study focuses on investigating how excess tin (II) iodide (SnI2) influences the photovoltaic performance of 1.4 eV wide bandgap Sn-Pb perovskite solar cells. The introduction of SnI2 in different concentrations (0, 0.25, 0.5, and 0.75 mmol) into the precursor solutions allowed for a systematic evaluation of its impact on device efficiency. Current-voltage (J-V) measurements showed that the PSCs with 0.25 mmol excess SnI2 achieved the highest PCE of 15.88%, with Voc at 0.86 V, Jsc at 24.02 mA/cm², and FF at 0.77 during forward scans. This concentration of SnI2 was found to promote enhanced crystallinity, improved charge carrier transport properties, and minimized recombination losses, aligning well with the principles outlined in the Shockley-Queisser limit, which posits the maximum theoretical efficiency based on the bandgap of the material. In conclusion, this study provides valuable insights into the optimization of 1.4 eV wide bandgap Sn-Pb perovskite solar cells through the controlled addition of excess SnI2. The optimal concentration of 0.25 mmol SnI2 was identified as crucial for maximizing device performance, emphasizing improved crystallinity, enhanced charge transport, and minimized recombination losses. These findings contribute to the ongoing efforts to develop efficient and stable PSCs, guided by the principles of the Shockley-Queisser limit and informed by advancements in perovskite materials research.