Tin-based Perovskite Solar Cells and All-perovskite Tandem Solar Cells

Shuzi Hayase^a

^aThe University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Tokyo, Japan

Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS Spring 2024 Conference (MATSUS24)

#SusPer - Sustainability of halide perovskites

Barcelona, Spain, 2024 March 4th - 8th

Organizers: Francesca Brunetti and Iris Visoly-Fisher

Invited Speaker, Shuzi Hayase, presentation 010
DOI: https://doi.org/10.29363/nanoge.matsus.2024.010
Publication date: 18th December 2023

Sn-based perovskite solar cells (Sn-based PVK-PV) are attracting attentions, because these bandgaps (1.2 -1.4 eV) are narrower than that of Pb-PVK-PV (wider than 1.55 eV). All-perovskite tandem cells are composed of the top cell having 1.6-1.8 eV band gap (Pb-PVK-PV) and the bottom cell having 1.1-1.3 eV band gap (Sn-based PVK-PV). 28.2 % has been reported as the highest efficiency of the tandem cell [1]. To improve the tandem solar cell efficiency, optimization of the Pb-PVK-PV for the top cell, the Sn-based PVK-PV for the bottom cell, and the interconnecting layer are needed. We have reported Pb-free Sn-PVK-PV with 14.6% efficiency [2,3] and SnPb-PVK-PV with 23.3% efficiency [4]. In this presentation, recent progresses of these two Sn-based PVK-PVs in our Lab and those of all-perovskite solar cells are reported. PEDOT-PSS is commonly employed as the hole transport layer (HTL) for the Sn-based PVK-PV. However, it has been reported that low stability is caused by the PEDOT-PSS. This prompted us to develop PEDPT-PSS-free Sn-based PVK-PV. Recently, we found that SnOx was effective for the HTL of the Sn-PVK-PV, even though SnO2 family is well-known as the electron transport layer. The basic structure is FTO glass/SnOx/Sn-PVK/C60/BCP/Ag. Efficiency over 14% and the carrier dynamics are reported. The direct Sn metal deposition on the perovskite to reduce Sn4+ concentration is included in the presentation[2,3]. As for SnPb-perovskite solar cells, the relationship between the high temperature stability and the cell structures are discussed. The stable SnPb-PVK-PV at 85 ℃ is reported. Finally, All-perovskite tandem solar cells (26-27 % efficiency) consisting of Pb-PVK PV (top cell) and PbSn-PVK PV (bottom cells) are reported [5].

References:

[1] Martin A. Green, Ewan D. Dunlop, Masahiro Yoshita, Nikos Kopidakis, Karsten Bothe, Gerald Siefer, Xiaojing Hao, “Solar cell efficiency tables (version 62)” Prog. Photovolt. Res. Appl, 2023, 31, 651-663.

[2] Wang Liang, Chen Mengmeng, Yang Shuzhang, Uezono Namiki, Miao Qingqing, Kapil Gaurav, Baranwal Ajay, Sanehira Yoshitaka, Wang Dandan, Liu Dong, Ma Tingli, Ozawa Kenichi, Sakurai Takeaki, Zhang Zheng, Shen Qing, Hayase Shuzi, “SnOx as Bottom Hole Extraction Layer and Top In-situ Protection Layer Yields over 14% Efficiency in Sn-based Perovskite Solar Cells”, ACS Energy Lett., 2022, 7, 10, 3703-3708.

[3] Liang Wang, Qingqing Miao, Dandan Wang, Mengmeng Chen, Huan Bi, Jiaqi Liu, Ajay Kumar Baranwal, Gaurav Kapil, Yoshitaka Sanehira, Takeshi Kitamura, Tingli Ma, Zheng Zhang, Qing Shen, Shuzi Hayase, “14.31 % Power Conversion Efficiency of Sn-Based Perovskite Solar Cells via Efficient Reduction of Sn4+”, Angewandte, 2023, 135, e202307228.

[4] Gaurav Kapil, Takeru Bessho, Yoshitaka Sanehira, Shahrir R. Sahamir, Mengmeng Chen, Ajay Kumar Baranwal, Dong Liu, Yuya Sono, Daisuke Hirotani, Daishiro Nomura, Kohei Nishimura, Muhammad Akmal Kamarudin, Qing Shen, Hiroshi Segawa, Shuzi Hayase, “Tin-lead perovskite solar cells fabricated on hole selective monolayers”, ACS Energy Letters, 2022,7, 966-974.

[5] Bi, Huan, Liu, Jiaqi, Zhang, Zheng, Wang, Liang, Beresneviciute, Raminta, Tavgeniene, Daiva, Kapil, Gaurav, Ding, Chao, Baranwal, Ajay, Sahamir, Shahrir Razey, Sanehira, Yoshitaka, Segawa, Hiroshi, Grigalevicius, Saulius, Shen, Qing, Hayase, Shuzi, "All Perovskite Tandem Solar Cells Approach 26.5% Efficiency by Employing Wide Bandgap Lead Perovskite Solar Cells with New Mono-molecular HTL Layer", ACS Energy Letters, 2023, 8, 3852-3859.

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