Advanced Functional Materials
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Photovoltaic and Amplified Spontaneous Emission Studies of High-Quality Formamidinium Lead Bromide Perovskite Films

Authors

  • Neha Arora,

    1. Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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  • M. Ibrahim Dar,

    Corresponding author
    1. Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
    2. Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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  • Mahmoud Hezam,

    1. King Abdullah Institute for Nanotechnology, King Saud University, Riyadh, Saudi Arabia
    2. Laboratory of Quantum Optoelectronics, Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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  • Wolfgang Tress,

    1. Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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  • Gwénolé Jacopin,

    1. Laboratory of Quantum Optoelectronics, Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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  • Thomas Moehl,

    1. Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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  • Peng Gao,

    1. Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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  • Abdulah Saleh Aldwayyan,

    1. Physics and Astronomy Dept, Photonics Lab, College of Science, King Saud University, Riyadh, Saudi Arabia
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  • Benoit Deveaud,

    1. Laboratory of Quantum Optoelectronics, Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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  • Michael Grätzel,

    1. Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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  • Mohammad Khaja Nazeeruddin

    Corresponding author
    1. Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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Abstract

This study demonstrates the formation of extremely smooth and uniform formamidinium lead bromide (CH(NH2)2PbBr3 = FAPbBr3) films using an optimum mixture of dimethyl sulfoxide and N,N-dimethylformamide solvents. Surface morphology and phase purity of the FAPbBr3 films are thoroughly examined by field emission scanning electron microscopy and powder X-ray diffraction, respectively. To unravel the photophysical properties of these films, systematic investigation based on time-integrated and time-dependent photoluminescence studies are carried out which, respectively, bring out relatively lower nonradiative recombination rates and long lasting photogenerated charge carriers in FAPbBr3 perovskite films. The devices based on FTO/TiO2/FAPbBr3/spiro-OMeTAD/Au show highly reproducible open-circuit voltage (Voc) of 1.42 V, a record for FAPbBr3-based perovskite solar cells. Voc as a function of illumination intensity indicates that the contacts are very selective and higher Voc values are expected to be achieved when the quality of the FAPbBr3 film is further improved. Overall, the devices based on these films reveal appreciable power conversion efficiency of 7% under standard illumination conditions with negligible hysteresis. Finally, the amplified spontaneous emission (ASE) behavior explored in a cavity-free configuration for FAPbBr3 perovskite films shows a sharp ASE threshold at a fluence of 190 μJ cm−2 with high quantum efficiency further confirming the high quality of the films.

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DOI

10.1002/adfm.201504977

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© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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Keywords

  • amplified spontaneous emission;
  • formamidinium lead bromide;
  • perovskite;
  • photovoltage;
  • solar cells

Publication History

  • Issue online:
  • Version of record online:
  • Manuscript Revised:
  • Manuscript Received:

Funded by

  • Swiss confederation
  • European Community's Seventh Framework Programme. Grant Numbers: 281063, 604032
  • National Plan for Science, Technology and Innovation
  • King Abdulaziz City for Science and Technology
  • Kingdom of Saudi Arabia. Grant Number: ENE1474-02

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