A new type of hole transporting material (HTMs) with an incorporated planar amine or triphenylamine as a core unit have been prepared. The two amine derivatives were demonstrated to be efficient hole transporting materials in fabricating solid-state organic-inorganic hybrid solar cells. Perovskite-based solar cells with a planar amine derivative gave a short circuit photocurrent density (Jsc) of 20.98 m Acm(-2), an open circuit voltage (Voc) of 0.972 V, and a fill factor of 0.67, corresponding to an overall conversion efficiency of 13.63 %. The photovoltaic performance is comparable to that of the standard spiro-OMeTAD. Moreover, the device showed good stability under light soaking for 500 h. These HTMs hold promise to replace the expensive spiro-OMeTAD because of their high efficiency, excellent stability, synthesis from simple and inexpensive materials.
High-performance
organic semiconductors based on an electron-rich alkylsilylethynyl
benzodithiophene (TIPSBDT) core were newly synthesized and characterized
for use in solution-processed small-molecule organic solar cells.
The rigid and extended π-conjugation of the TIPSBDT motifs facilitates
intramolecular charge transfer and intermolecular π–π
packing interactions of semiconducting small molecules in the BHJ
film enhanced by processing additives and induces deep HOMO levels
producing high open-circuit voltage of ∼1.0 V, exhibiting notable
power conversion efficiency of 5.84% from a bulk-heterojunction film
with PC61BM.
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