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Cut from the Same Cloth: Enamine-Derived Spirobifluorenes as Hole Transporters for Perovskite Solar Cells

To attain commercial viability, perovskite solar cells (PSCs) have to be reasonably priced, highly efficient, and stable for a long period of time. Although a new record of a certified power conversion efficiency (PCE) value over 25% was achieved, PSC performance is limited by the lack of hole-transporting materials (HTMs), which extract positive charges from the light-absorbing perovskite layer and carry them to the electrode. Here, we report spirobifluorene-based HTMs with finely tuned energy levels, high glass-transition temperature, and excellent charge mobility and conductivity enabled by molecularly engineered enamine arms. HTMs are synthesized using simple condensation chemistry, which does not require costly catalysts, inert reaction conditions, and time-consuming product purification procedures. Enamine-derived HTMs allow the fabrication of PSCs reaching a maximum PCE of 19.2% and stability comparable to spiro-OMeTAD. This work demonstrates that simple enamine condensation reactions could be used as a universal path to obtain HTMs for highly efficient and stable PSCs.
- École Polytechnique Fédérale de Lausanne EPFL Switzerland
- Institute of Chemical and Engineering Sciences Singapore
- Vilnius University Lithuania
- Kaunas University of Technology Lithuania
- King Abdulaziz University Saudi Arabia
hole-transporting materials, enamine arms, Chemical Sciences not elsewhere classified, high-performance, Same Cloth, mobilities, design, reaction conditions, Enamine-Derived Spirobifluorenes, condensation chemistry, low-cost, Hole Transporters, energy levels, 660, layer, light-absorbing perovskite layer, low-cost ; highly efficient ; high-performance ; mobilities ; stability ; design ; layer, PSC performance, report spirobifluorene-based HTMs, stability, PCE, power conversion efficiency, product purification procedures, highly efficient, enamine condensation reactions, charge mobility, glass-transition temperature, Perovskite Solar Cells, Physical Sciences not elsewhere classified, Enamine-derived HTMs, Biotechnology
hole-transporting materials, enamine arms, Chemical Sciences not elsewhere classified, high-performance, Same Cloth, mobilities, design, reaction conditions, Enamine-Derived Spirobifluorenes, condensation chemistry, low-cost, Hole Transporters, energy levels, 660, layer, light-absorbing perovskite layer, low-cost ; highly efficient ; high-performance ; mobilities ; stability ; design ; layer, PSC performance, report spirobifluorene-based HTMs, stability, PCE, power conversion efficiency, product purification procedures, highly efficient, enamine condensation reactions, charge mobility, glass-transition temperature, Perovskite Solar Cells, Physical Sciences not elsewhere classified, Enamine-derived HTMs, Biotechnology
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