Ligand chemistry of titania precursor affects transient photovoltaic behavior in inverted organic solar cells
- Ligand chemistry of titania precursor affects transient photovoltaic behavior in inverted organic solar cells
- 김종복; 안석훈; 강석주; Colin Nuckolls; Yueh-Lin Loo
- solar cells; photovoltaic
- Issue Date
- Applied physics letters
- VOL 102, NO 10, 103302-1-103302-4
- The chemistry of the precursor from which charge transport layers are formed can significantly
affect the device performance of organic solar cells. Here, we compare two common precursors
that are used to generate titania electron transport layers and elucidate their effects on the transient
characteristics of inverted bulk-heterojunction polymer solar cells comprising poly(3-hexyl
hiophene) and [6,6]-phenyl-C61-butyric acid methyl ester. Substituting the isopropyl ligands of
titanium isopropoxide with 2-methoxyethanol leads to electron transport layers that require a
shorter illumination time to fill shallow electron traps. Furthermore, organic solar cells with titania
electron transport layers prepared with such pre-modified titania precursor exhibit higher powerconversion
efficiencies stemming from lower trap densities.
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