Pyrazine based pi-conjugated polymers for dopant free Green Solvent Processed Hole Transport Material enabled efficient perovskite solar cells
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The new Polymer is designed and synthesized for fabrication of perovskite solar cells (PSCs) application. BDTTN-PTEH used as dopant-free Green solvent processed hole transport material (HTM). The thermal, photophysical and electrochemical properties of BDTN-PDTEH were systematically investigated. BDTN-PDTEH exhibited a band gap of 1.96 eV with highest occupied molecular orbital (HOMO) of -5.596eV and Lowest unoccupied molecular orbital (LUMO) of -3.636eV. The electron withdrawing nature of pyrazine results in better intermolecular interactions, affording high hole mobility and charge transfer properties. Thus, optimized BDTN-PDTEH based device showed the power conversion efficiency of 21.2% with open-circuit voltage of 1.07V, a short-circuit current density of 25.07mA/cm2and a fill factor of 78.96%. This result indicated that pyrazine based polymer have great to further development of HTM.