Monolithic Two-Terminal All-Perovskite Tandem Solar Cells with Power Conversion Efficiency Exceeding 21%

Conference · Thu Feb 06 04:00:00 EST 2020

DOI:https://doi.org/10.1109/PVSC40753.2019.8980866· OSTI ID:1604592

Song, Zhaoning ^[1]; Zhao, Dewei ^[1]; Chen, Cong ^[1]; Ahangharnejhad, Ramez H. ^[1]; Li, Chongwen ^[1]; Ghimire, Kiran ^[1]; Podraza, Nikolas J. ^[1]; Zhu, Kai ^[2]; Heben, Michael J. ^[1]; Yan, Yanfa ^[1]

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1. University of Toledo
2. National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Monolithic two-terminal (2-T) all-perovskite tandem solar cells are a promising candidate for the next generation solar cells with ultrahigh efficiency and low fabrication cost. Here, we report on the fabrication of 2-T all-perovskite tandem solar cells consisting of solution-processed wide-bandgap and low-bandgap perovskite subcells connected by a vacuum processed interconnection layer. We employed a bulk-passivation strategy to enlarge the grain size, increase carrier mobilities, reduce electronic disorder, and suppress trap-assisted recombination in the low bandgap mixed Sn-Pb perovskite films, which leads to improved performance of low bandgap perovskite solar cells with an absorber thickness over 750 nm. This advance in high-quality low-bandgap perovskite layers enables the fabrication of efficient 2-T all-perovskite solar cells with power conversion efficiencies of more than 21% and decent stability. Our approach provides a suitable pathway to realize ultra-high efficiency 2-T all-perovskite tandem solar cells.

• Research Organization: National Renewable Energy Laboratory (NREL), Golden, CO (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: AC36-08GO28308
• OSTI ID: 1604592
• Report Number(s): NREL/CP-5900-76341
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
42 ENGINEERING
passivation
perovskite
photovoltaic
stability
tandem solar cells