Monolithic perovskite/silicon tandem solar cell with >29% efficiency by enhanced hole extraction

By A. Al‐Ashouri, E. Köhnen, Bor Li, A. Magomedov, H. Hempel, P. Caprioglio, J. Márquez, Anna Belen Morales Vilches, Ernestas Kasparavičius, Joel A. Smith and 20 more. Science, 2020

1,596 citations recorded by the source corpus.

Efficiency from hole-selective contacts Perovskite/silicon tandem solar cells must stabilize a perovskite material with a wide bandgap and also maintain efficient charge carrier transport. Al-Ashouri et al. stabilized a perovskite with a 1.68–electron volt bandgap with a self-assembled monolayer that acted as an efficient hole-selective contact that minimizes nonradiative carrier recombination. In air without encapsulation, a tandem silicon cell retained 95% of its initial power conversion efficiency of 29% after 300 hours of operation. Science, this issue p. 1300 A hole-selective self-assembled monolayer rapidly extracts charge in highly efficient perovskite/silicon tandem solar cells. Tandem solar cells that pair silicon with a metal halide perovskite are a promising option for surpassing the single-cell efficiency limit. We report a monolithic perovskite/silicon tandem with a certified power conversion efficiency of 29.15%. The perovskite absorber, with a bandgap of 1.68 electron volts, remained phase-stable under illumination through a combination of fast hole extraction and minimized nonradiative recombination at the hole-selective interface. These features were made possible by a self-assembled, methyl-substituted carbazole monolayer as the hole-selective layer in the perovskite cell. The accelerated hole extraction was linked to a low ideality factor of 1.26 and single-junction fill factors of up to 84%, while enabling a tandem open-circuit voltage of as high as 1.92 volts. In air, without encapsulation, a tandem retained 95% of its initial efficiency after 300 hours of operation.

Subfields: Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/f732364606aa81963da8ed2740ff94563de8b5c0

Citations in the corpus

• Buried interface molecular hybrid for inverted perovskite solar cells (2024, neutral): “Methylamine hydrochloride (MACl), [4-(3,6-dimethyl-9 H -carbazol-9-yl)butyl]phosphonic acid (Me-4PACz), caesium iodide (CsI) and bathocuproine (BCP) were obtained from TCI America.”
• Surface reaction for efficient and stable inverted perovskite solar cells (2022, neutral): “An ideal surface engineering approach for p–i–n PSCs should: (1) not negatively affect the bulk quality of the perovskite film; (2) not produce materials hindering charge transfer; (3) reduce the density of unwanted defects; and/or (4) have a surface region that creates a built-in electric field, en”