[11p-Z11-1~14] 12.5 Organic solar cells

▲ [11p-Z11-8] Surface passivation to reduce the voltage loss in tin-lead mixed perovskite solar cells

〇(P)Gaurav Kapil¹, Qing Shen¹, Hiroshi Segawa², Shuzi Hayase¹ (1.Uni. of Elec-Comm, 2.Uni. of Tokyo)

Keywords:Tin-lead perovskite, Surface passivation, Low voltage loss

Tin-lead (Sn-Pb) perovskite solar cells (PSCs) are the potential candidate to achieve the high efficiency for the single-junction solar cells as estimated by Shockley-Queisser (SQ) limit due to their ideal bandgap of 1.2-1.3 eV [1]. Also, the low bandgap of these materials makes them suitable for their implementation as the bottom cell in the tandem solar cell. Other advantages of these perovskite materials are their broad photon harvesting capability until 1060nm allowing them to use in the development of PSCs with high short circuit current density (Jsc) [2,3]. Despite all the above advantages, it is well known that these materials suffer from rapid oxidation of Sn²⁺ to Sn⁴⁺ leading to high voltage loss that finally results in poor performance of the PSCs based on these materials. To circumvent such problems, many researchers have recently focused on the use of different strategies such as the use of different reducing agents, the addition of large organic cations into the lattice to form quasi 2D-3D Sn-Pb perovskites, or the use of passivation layers to inhibit the rapid oxidation [2]. In this work, we will report the use of an organic cation which partially includes the effect of all the above-mentioned strategies that led us to improve the reproducibility and stability of the Sn-Pb based PSCs.
References
W. Shockley, H. J. Queisser, J. Appl. Phys. 1961, 32, 510.
J. Tong and K. Zhu et al. DOI: 10.1126/science.aav7911.
G. Kapil and S. Hayase et al., Nanoletters, 2018, 18, 3600-3607.