[24p-E206-1~12] 12.5 Organic solar cells

▲ [24p-E206-5] Tin-lead perovskite solar cells fabricated on co-absorbed phosphonic acid monolayers

〇(P)Gaurav Kapil^1,2, Takeru Bessho², Qing Shen¹, Hiroshi Segawa², Shuzi Hayase¹ (1.Uni. of Elect.com., 2.The Uni. of Tokyo)

Keywords:Perovskite solar cells, Narrow bandgap, hole selective monolayer

Recently, tin-lead (Sn-Pb) perovskite solar cells (PSCs) are getting a good deal of attention because of their ideal bandgap that lies in the high-efficiency zone of Shockley-Queisser (SQ) limit plot for the single-junction solar cells [1]. To date, efficient Sn-Pb PSCs are fabricated on the conventional hole transport layer, PEDOT: PSS, which is acidic and hygroscopic and hence not an ideal candidate for the long-term stability of these solar cells. We have already reported the power conversion efficiency (PCE) of 21.74% in Sn-Pb PSCs using Cs_0.025FA_0.475MA_0.5Sn_0.5Pb_0.5I₃Br_3-x (1.25 eV) absorber layers [2]. To further enhance the PCE, in this work, we have realized that replacement of PEDOT: PSS is necessary to increase the PCE and stability of these solar cells. Therefore, we replaced PEDOT: PSS completely with hole selective monolayers (HSMs), which is the first report of using HSMs in Sn-Pb PSCs. The idea is partly inspired by the recent development in Pb-PSCs as well [3]. Moreover, we have reported that the junction between transparent conducting oxide (TCO) electrode and HSM plays a very important role in reducing the open-circuit voltage (Voc) loss. Finally, we have achieved the PCE of 23.3% which is also among the highest reported PCEs in the field of PSCs using inverted p-i-n configuration.
References
1. W. Shockley, H. J. Queisser, J. Appl. Phys. 1961, 32, 510.
2. G. Kapil and S. Hayase et al., Adv. Energy. Mat., 2021, 11, 2101069.
3. A. Al-Ashouri and S. Albrecht et al. Energy Environ. Sci., 2019, 12, 3356-3369.