Hot Hole Transfer Increasing Polaron Yields in Hybrid Conjugated Polymer/PbS Blends.
We use quasi-steady-state photoinduced absorption (PIA) to study charge generation in blends of poly(3-hexylthiophene-2,5-diyl) (P3HT) with PbS nanocrystal quantum dots as a function of excitation energy. We find that, per photon absorbed, the yield of photogenerated holes present on the conjugated polymer increases with pump energy, even at wavelengths where only the quantum dots absorb. We interpret this result as direct evidence for transfer of hot holes in these conjugated polymer/quantum dot blends. These results help understand the operation of hybrid organic/inorganic photovoltaics.
Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States.
Elisabeth
E
Strein
Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States.
Dane W
DW
deQuilettes
Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States.
Stephen T
ST
Hsieh
Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States.
Adam E
AE
Colbert
Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States.
David S
DS
Ginger
charge transfer; exciton; photoinduced absorption spectroscopy; quantum dots; solar cell