A molecularly engineered hole-transporting material for efficient perovskite solar cells

Michael Saliba, Simonetta Orlandi, Taisuke Matsui, Sadig Aghazada, Marco Cavazzini, Juan-Pablo Correa-Baena, Peng Gao, Rosario Scopelliti, Edoardo Mosconi, Klaus-Hermann Dahmen, Filippo De Angelis, Antonio Abate, Anders Hagfeldt, Gianluca Pozzi, Michael Graetzel and Mohammad Khaja Nazeeruddin ()
Additional contact information
Michael Saliba: Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, EPFL VALAIS, Rue de l’industrie 17, CP 440
Simonetta Orlandi: Istituto di Scienze e Tecnologie Molecolari del Consiglio Nazionale delle Ricerche
Taisuke Matsui: Materials Research Laboratory, Panasonic Corporation
Sadig Aghazada: Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, EPFL VALAIS, Rue de l’industrie 17, CP 440
Marco Cavazzini: Istituto di Scienze e Tecnologie Molecolari del Consiglio Nazionale delle Ricerche
Juan-Pablo Correa-Baena: Laboratory for Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne
Peng Gao: Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, EPFL VALAIS, Rue de l’industrie 17, CP 440
Rosario Scopelliti: Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, EPFL VALAIS, Rue de l’industrie 17, CP 440
Edoardo Mosconi: Computational Laboratory for Hybrid Organic Photovoltaics (CLHYO)
Klaus-Hermann Dahmen: Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University
Filippo De Angelis: Computational Laboratory for Hybrid Organic Photovoltaics (CLHYO)
Antonio Abate: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne
Anders Hagfeldt: Laboratory for Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne
Gianluca Pozzi: Istituto di Scienze e Tecnologie Molecolari del Consiglio Nazionale delle Ricerche
Michael Graetzel: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne
Mohammad Khaja Nazeeruddin: Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, EPFL VALAIS, Rue de l’industrie 17, CP 440

Nature Energy, 2016, vol. 1, issue 2, 1-7

Abstract: Abstract Solution-processable perovskite solar cells have recently achieved certified power conversion efficiencies of over 20%, challenging the long-standing perception that high efficiencies must come at high costs. One major bottleneck for increasing the efficiency even further is the lack of suitable hole-transporting materials, which extract positive charges from the active light absorber and transmit them to the electrode. In this work, we present a molecularly engineered hole-transport material with a simple dissymmetric fluorene–dithiophene (FDT) core substituted by N,N-di-p-methoxyphenylamine donor groups, which can be easily modified, providing the blueprint for a family of potentially low-cost hole-transport materials. We use FDT on state-of-the-art devices and achieve power conversion efficiencies of 20.2% which compare favourably with control devices with 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD). Thus, this new hole transporter has the potential to replace spiro-OMeTAD.

Date: 2016
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DOI: 10.1038/nenergy.2015.17

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