What question did this study set out to answer?

To determine the electronic density of states and understand carrier transport mechanisms in bulk heterojunction organic solar cells.

April 25, 2011Physical Review B

Photoconductivity measurements of the electronic structure of organic solar cells

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Authors

RSR. A. StreetAustralian National University KSKatherine SongDelft University of Technology JNJohn E. NorthrupPalo Alto Research Center

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Implication

Spectroscopic study reveals exponential band tail states in organic solar cells, indicating that interfacial structural disorder dictates carrier transport dynamics.

Key Points

To determine the electronic density of states and understand carrier transport mechanisms in bulk heterojunction organic solar cells.
Measured the photoconductivity spectral response from the band-gap energy down to 1 eV to evaluate interfacial charge-transfer excitation.
Performed temperature-dependent transient photoconductivity experiments to evaluate carrier mobility and dispersive transport dynamics in bulk heterojunction structures.
Formulated theoretical density-of-states models and multiple trapping simulations incorporating structural disorder within polymer chain pi-pi spacing.
Detected a low-energy sub-bandgap optical absorption band extending down to 1 eV, evidencing an exponential band tail of localized electronic states at the polymer-fullerene interface.
Observed temperature-dependent carrier dispersion during transient transport that aligns with a multiple trapping model operating over the localized band tail states.
Demonstrated that theoretical modeling of pi-pi stacking disorder reproduces an exponential density-of-states distribution matching experimental absorption and transport findings.

Cite This Study

Street et al. (2011) studied this question.

synapsesocial.com/papers/6a812ad5d433ecbb06e1b2a3 https://doi.org/10.1103/physrevb.83.165207

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Implication

Spectroscopic study reveals exponential band tail states in organic solar cells, indicating that interfacial structural disorder dictates carrier transport dynamics.

Photoconductivity measurements of the electronic structure of organic solar cells

Discussion

Member takes

Implication

Key Points

Cite This Study

Photoconductivity measurements of the electronic structure of organic solar cells

Discussion

Member takes

Implication

Key Points

Cite This Study

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