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https://pdf.sciencedirectasse ts.com/280655/AIP/1-s2.0-S2211285522012149/main.pdf?X-Amz-Security-Toke
Reducing the number of interface defect states and enhancing the charge transfer capability of the charge transport layer have become important strategies to improve the efficiency and stability of perovskite solar cells . In this study, the authors used a holistic interfacial strategy using three-dimensional (3D) triphenylamine-based nanographene (NG) precursors with well-defined molecular structures and various functional groups (F, Br, and OMe) to achieve efficient trans-PSCs. The three-dimensional NG precursor forms a bridge between the perovskite film and the poly(3,4-ethylenedioxythiophene):polystyrenesulfonic acid (PEDOT:PSS) hole transport layer (HTL), reducing the interface defect state and also passivating the defect state of the bulk perovskite through automatic bottom-up passivation. Computational simulations and experimental results show that the functional groups of the three-dimensional NG precursor anchor the perovskite by forming strong F··Pb, Br··Pb and OMe···Pb coordination bonds . Through these synergistic properties, the photovoltaic performance characteristics of trans-PSCs are greatly improved, with an increase in absolute efficiency of more than 3%. This new practical approach to interface engineering of trans-PSCs can enhance their PCEs and heat and light immersion and long-term stability.
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