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Optoelectronic conversion by polarization current, triggered by space charges at organic-based interfaces
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FIG. 1.

(a) A schematic display of a double-layer model for an anode/BL/CSL/cathode photosensor, in which photogenerated electrons in the CSL are collected by the cathode and the accumulated holes at the BL/CSL interface, triggering a polarization current in the BL. The inset shows the chemical structures of PVDF and donor-acceptor (1:1) systems. (b) The photoresponse of an ITO/PVDF (30 nm)/Al photocell under illumination from a modulated 532 nm laser (300 Hz) with different intensities. The sample was illuminated from the ITO side under a bias voltage of 0 V.

Image of FIG. 2.

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FIG. 2.

Simulations for the positive TPC based on (a) Eq. (1) and (b) Eq. (S5) with an RC time constant of at 100 Hz. The red lines are theoretical data and the blue points are experimental data from Fig. 1(b).

Image of FIG. 3.

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FIG. 3.

The dielectric constant dependence of the TPC under an illumination (532 nm) of . (a)–(c) show the short-circuit TPC in the MISM photosensor with PVDF, polystyrene, and vacuum gap as BLs, respectively. The thickness of the BLs and CSLs are and 20 nm, respectively.

Image of FIG. 4.

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FIG. 4.

Impulse response of the ITO/PVDF (20 nm)/Al photosensor under a zero bias voltage. The RC constant in this circuit was estimated to be . A nanosecond laser (10 Hz; 600 nm; ) with a pulse width of was utilized. The inset is a magnified version of the recovery process.

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/content/aip/journal/apl/96/24/10.1063/1.3454915
2010-06-16
2014-04-23

Abstract

We report that a highly efficient optoelectronic conversion can be achieved by photogenerated space charges, which usually damp photocurrent. Theoretical analysis of metal-organic insulator-organic semiconductor-metal photocells indicates the generation of a large transient current that is triggered by photogenerated space charges and governed by the dielectric properties of the insulator layer. We experimentally demonstrated this mechanism with model photocells, revealing that the quantum efficiency can be dramatically increased by increasing the dielectric constant of the insulator.

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Scitation: Optoelectronic conversion by polarization current, triggered by space charges at organic-based interfaces
http://aip.metastore.ingenta.com/content/aip/journal/apl/96/24/10.1063/1.3454915
10.1063/1.3454915
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