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

作者：Saliba, Michael; Orlandi, Simonetta; Matsui, Taisuke; Aghazada, Sadig; Cavazzini, Marco; Correa-Baena, Juan-Pablo; Gao, Peng; Scopelliti, Rosario; Mosconi, Edoardo; Dahmen, Klaus-Hermann; De Angelis, Filippo; Abate, Antonio; Hagfeldt, Anders; Pozzi, Gianluca; Graetzel, Michael; Nazeeruddin, Mohammad Khaja^*

来源：Nature Energy, 2016, 1(2): 15017.

DOI：10.1038/NENERGY.2015.17

• HIGHLY EFFICIENT
• SPIRO-OMETAD
• PERFORMANCE

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.

• 出版日期2016-1-18