All-perovskite tandem solar cells with improved grain surface passivation - Nature

1/18/2022 2:31:00 PM

Nature research paper: All-perovskite tandem solar cells with improved grain surface passivation

Photovoltaics, Solar Cells

Nature research paper: All-perovskite tandem solar cells with improved grain surface passivation

Nature - <ArticleTitle Language="En" xml:lang="en">All-perovskite tandem solar cells with improved grain surface...

1–3; however, until now, the best-performing all-perovskite tandems have exhibited lower certified efficiency than have single-junction perovskite solar cells4,5. A thick mixed Pb-Sn narrow-bandgap subcell is needed to achieve high photocurrent density in tandems

6; yet this is challenging owing to the short carrier diffusion length within Pb-Sn perovskites. Here we develop ammonium-cation-passivated Pb-Sn perovskites with long diffusion lengths, enabling subcells having an absorber thickness of ~1.2 μm. Molecular dynamics simulations suggest that widely-used phenethylammonium (PEA) cations are only partially adsorbed on the surface defective sites at perovskite crystallization temperatures. The passivator adsorption is predicted to be enhanced using 4-trifluoromethyl-phenylammonium (CF3-PA), which exhibits a stronger perovskite surface-passivator interaction than does PEA. By adding a small amount of CF3-PA into precursor solution, we increase the carrier diffusion length within Pb-Sn perovskites by 2x, to over 5 μm, and increase the efficiency of Pb-Sn perovskite solar cells to over 22%. We report a certified efficiency of 26.4% in all-perovskite tandem solar cells, exceeding that of the best-performing single-junction perovskite solar cells. Encapsulated tandem devices retain >90% of initial performance following 600 hours of operation at the maximum power point under one-sun illumination in ambient conditions.

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All-perovskite tandem solar cells with improved grain surface passivation - NatureNature - &lt;ArticleTitle Language=&quot;En&quot; xml:lang=&quot;en&quot;&gt;All-perovskite tandem solar cells with improved grain surface...

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All-perovskite tandem solar cells hold the promise of surpassing the efficiency limits of single-junction solar cells 1–3 ; however, until now, the best-performing all-perovskite tandems have exhibited lower certified efficiency than have single-junction perovskite solar cells 4,5 .All-perovskite tandem solar cells hold the promise of surpassing the efficiency limits of single-junction solar cells 1–3 ; however, until now, the best-performing all-perovskite tandems have exhibited lower certified efficiency than have single-junction perovskite solar cells 4,5 .Download references Acknowledgements This study was supported by the Leverhulme Trust (‘Nature and impacts of Middle Pleistocene volcanism in the Ethiopian Rift’, 2016–21) and the Cambridge-Africa ALBORADA Research Fund (‘Volcanic tie-lines between records of past climates and early modern humans in Ethiopia, 2019–21’).Return to List   Nature Research is a flagship portfolio of journals, products and services including Nature and the Nature-branded journals, dedicated to serving the scientific community.

A thick mixed Pb-Sn narrow-bandgap subcell is needed to achieve high photocurrent density in tandems 6 ; yet this is challenging owing to the short carrier diffusion length within Pb-Sn perovskites. Here we develop ammonium-cation-passivated Pb-Sn perovskites with long diffusion lengths, enabling subcells having an absorber thickness of ~1. Here we develop ammonium-cation-passivated Pb-Sn perovskites with long diffusion lengths, enabling subcells having an absorber thickness of ~1.2 μm. We acknowledge the local and regional authorities in Ethiopia for facilitating fieldwork and sample export, including the School of Earth Sciences Addis Ababa University, the Oromiya Regional State, the Ngangatom Woreda Local Administration and the FDRE Ministry of Mines, Petroleum and Natural Gas. Molecular dynamics simulations suggest that widely-used phenethylammonium (PEA) cations are only partially adsorbed on the surface defective sites at perovskite crystallization temperatures. Molecular dynamics simulations suggest that widely-used phenethylammonium (PEA) cations are only partially adsorbed on the surface defective sites at perovskite crystallization temperatures. The passivator adsorption is predicted to be enhanced using 4-trifluoromethyl-phenylammonium (CF3-PA), which exhibits a stronger perovskite surface-passivator interaction than does PEA. You will cultivate sources within the government and biomedical research community to generate enterprise stories.

By adding a small amount of CF3-PA into precursor solution, we increase the carrier diffusion length within Pb-Sn perovskites by 2x, to over 5 μm, and increase the efficiency of Pb-Sn perovskite solar cells to over 22%. By adding a small amount of CF3-PA into precursor solution, we increase the carrier diffusion length within Pb-Sn perovskites by 2x, to over 5 μm, and increase the efficiency of Pb-Sn perovskite solar cells to over 22%. We thank D. We report a certified efficiency of 26.4% in all-perovskite tandem solar cells, exceeding that of the best-performing single-junction perovskite solar cells.4% in all-perovskite tandem solar cells, exceeding that of the best-performing single-junction perovskite solar cells. Encapsulated tandem devices retain &gt;90% of initial performance following 600 hours of operation at the maximum power point under one-sun illumination in ambient conditions. Buisman and J. This is a preview of subscription content Access options . This is a preview of subscription content Access options. Your stories will be published online and in print.