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Temperature dependent photoresponse from colloidal PbS quantum dot sensitized inorganic/organic hybrid photodiodes
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Image of FIG. 1.

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FIG. 1.

(a) Sketch of the components included in the photosensitive ternary blend: P3HT (left), PbS quantum dots covered by oleic acid ligands (middle), and PCBM (right). (b) Schematic band diagram of the ternary blend. The light gray bars represent the temperature dependence of the quantum dot band gap energy, and the arrows indicate possible electron and hole transfers after photoexcitation of excitons in the dots. (c) Photocurrent and PL spectra of the used QDs at room temperature.

Image of FIG. 2.

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FIG. 2.

Temperature dependent photoresponse and PL of sample S1 containing 5.2 nm large PbS QDs. (a) I-V characteristics in dark (black lines) and under broadband infrared illumination with a power density of about (gray lines). (b) Photocurrent spectra under reverse bias and an illumination power density of about . (c) PL spectra for various temperatures. (d) Temperature dependence of PL line width and intensity (upper panel) and photocurrent deduced from (b) (lower panel).

Image of FIG. 3.

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FIG. 3.

Photoresponse of sample S2, containing PbS quantum dots, 4.3 nm in size. I-V characteristics (a) in dark and (b) under illumination with broadband infrared light. The inset shows the temperature dependence of the measured current (illuminated and in dark) at a bias of −1 V. (c) Photocurrent spectra (−1 V bias) and (d) temperature dependence of its peak at 1220 nm for −1 V bias and without bias.

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/content/aip/journal/apl/98/5/10.1063/1.3552678
2011-02-04
2014-04-19

Abstract

Inorganic/organic hybrid photodiodes, based on a solution-processed ternary blend containing PbSquantum dots(QDs), a fullerene derivative, and a conjugated polymer, have been reported to exhibit external quantum efficiencies in the infrared of up to 51% [T. Rauch et al., Nat. Photonics3, 332 (2009)]. Temperature dependent experiments reveal the high sensitivity of the photoresponse on the energy level alignment between the QDs and the fullerene derivative, resulting in quenching of the photoresponse at low temperatures for 5.2 nm QDs in size. With smaller QDs the optimum operation temperature is found between room temperature and , making these photodiodes promising for various applications.

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Scitation: Temperature dependent photoresponse from colloidal PbS quantum dot sensitized inorganic/organic hybrid photodiodes
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/5/10.1063/1.3552678
10.1063/1.3552678
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