Journal
NATURE ENERGY
Volume 1, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NENERGY.2015.17
Keywords
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Funding
- European Union [604032, ENERGY.2012.10.2.1, 308997]
- Swiss National Science Foundation [407040_154056]
- MG Nanotera
- Swiss National Science Foundation (SNF) [407040_154056] Funding Source: Swiss National Science Foundation (SNF)
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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.
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