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- W2038291399 abstract "We have measured continuous-wave (cw) photoinduced absorption (PA) spectra of PbS quantum dot (QD) films with four different sizes over a spectral range of 0.25−0.5 eV at T = 10 K. The PA spectrum shows a strong asymmetric IR absorption peak (IR-PA). Both the peak position and shape of this IR-PA indicate distinct confinement dependence. Combining with results of interband transitions and Stokes shift, we assign this IR-PA to a transition from a well-defined below-gap state to the second excitonic level (1P). By measuring the frequency dependence of this IR-PA, we estimate the lifetime of this below-gap state to be around several microseconds. Possible interpretations of the origin of this below-gap state are given. This transition could potentially be used to monitor photogenerated charge transfer in such QD systems." @default.
- W2038291399 created "2016-06-24" @default.
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- W2038291399 date "2008-07-18" @default.
- W2038291399 modified "2023-10-11" @default.
- W2038291399 title "Confinement-Dependent Below-Gap State in PbS Quantum Dot Films Probed by Continuous-Wave Photoinduced Absorption" @default.
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- W2038291399 doi "https://doi.org/10.1021/jp8047295" @default.
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