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Title: Synthetic control over orientational degeneracy of spacer cations enhances solar cell efficiency in two-dimensional perovskites

Journal Article · · Nature Communications
 [1];  [2]; ORCiD logo [3];  [3];  [4];  [4];  [4]; ORCiD logo [4];  [4];  [4];  [5]; ORCiD logo [5];  [5]; ORCiD logo [5];  [4];  [3];  [2]; ORCiD logo [6]
  1. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry; DOE/OSTI
  2. Colorado State Univ., Fort Collins, CO (United States). Dept. of Chemistry
  3. North Carolina State Univ., Raleigh, NC (United States). Dept. of Physics
  4. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry
  5. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Applied Physical Sciences
  6. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry; Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Applied Physical Sciences

Two-dimensional perovskites have emerged as more intrinsically stable materials for solar cells. Chemical tuning of spacer organic cations has attracted great interest due to their additional functionalities. However, how the chemical nature of the organic cations affects the properties of two-dimensional perovskites and devices is rarely reported. Here we demonstrate that the selection of spacer cations (i.e., selective fluorination of phenethylammonium) affects the film properties of two-dimensional perovskites, leading to different device performance of two-dimensional perovskite solar cells (average n = 4). Structural analysis reveals that different packing arrangements and orientational disorder of the spacer cations result in orientational degeneracy and different formation energies, largely explaining the difference in film properties. This work provides key missing information on how spacer cations exert influence on desirable electronic properties and device performance of two-dimensional perovskites via the weak and cooperative interactions of these cations in the crystal lattice.

Research Organization:
Colorado State Univ., Fort Collins, CO (United States); Univ. of California, Oakland, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; SC0016083
OSTI ID:
1612398
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Fluorinated Low‐Dimensional Ruddlesden–Popper Perovskite Solar Cells with over 17% Power Conversion Efficiency and Improved Stability journal July 2019
Optimization of Low‐Dimensional Components of Quasi‐2D Perovskite Films for Deep‐Blue Light‐Emitting Diodes journal September 2019
Reversible Thermochromism and Strong Ferromagnetism in Two‐Dimensional Hybrid Perovskites journal November 2019
Steric Mixed‐Cation 2D Perovskite as a Methylammonium Locker to Stabilize MAPbI 3 journal December 2019
Reversible Thermochromism and Strong Ferromagnetism in Two-Dimensional Hybrid Perovskites journal November 2019
Steric Mixed‐Cation 2D Perovskite as a Methylammonium Locker to Stabilize MAPbI 3 journal January 2020
An Effective Strategy for Photoelectric Performance Enhancement of 2D Perovskite via Halogenating Organic Cation: A Theoretical Prediction journal January 2020
Vertical Orientated Dion–Jacobson Quasi‐2D Perovskite Film with Improved Photovoltaic Performance and Stability journal December 2019
Enhancing Photovoltaic Performance of Aromatic Ammonium‐based Two‐Dimensional Organic‐Inorganic Hybrid Perovskites via Tuning CH···π Interaction journal October 2019
Interlayer Cross‐Linked 2D Perovskite Solar Cell with Uniform Phase Distribution and Increased Exciton Coupling journal April 2020
Influence of organic cation planarity on structural templating in hybrid metal-halides journal January 2019
Searching for stability at lower dimensions: current trends and future prospects of layered perovskite solar cells journal January 2019
Solvation effect in precursor solution enables over 16% efficiency in thick 2D perovskite solar cells journal January 2019