Hot Hole
Transfer Increasing Polaron Yields in Hybrid
Conjugated Polymer/PbS Blends
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Abstract
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