Detection of trap charge in small molecular organic bulk heterojunction solar cells
| Autor: | Karl Leo, Debdutta Ray, Lorenzo Burtone, Moritz Riede |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Theory of solar cells Organic solar cell business.industry Band gap Computer Science::Computation and Language (Computational Linguistics and Natural Language and Speech Processing) Charge (physics) Condensed Matter Physics Capacitance Polymer solar cell Electronic Optical and Magnetic Materials Semiconductor Electric field Optoelectronics Atomic physics business |
| Popis: | We detect and measure the trap charges in a small molecular bulk heterojunction solar cell under operating conditions. The trap-charge density is estimated from capacitance measurements with light incident on the sample. At high intensities ($\ensuremath{\sim}1\text{ }\text{sun}$, $100\text{ }\text{mW}/{\text{cm}}^{2}$), the trapped charge concentration leads to a spatial distortion of the electric field in the device. The lower limit of the trap-charge density is estimated to be $6\ifmmode\times\else\texttimes\fi{}{10}^{16}\text{ }{\text{cm}}^{\ensuremath{-}3}$. The frequency dependence of the capacitance suggests that the charges are trapped in a manifold of deep states present in the energy gap of the semiconductors. The distortion of the electric field by this trap charge affects the charge-carrier collection efficiency. |
| Databáze: | OpenAIRE |
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