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Photovoltaic properties of PSi impregnated with eumelanin.

Mula G, Manca L, Setzu S, Pezzella A - Nanoscale Res Lett (2012)

Bottom Line: A bulk heterojunction of porous silicon and eumelanin, where the columnar pores of porous silicon are filled with eumelanin, is proposed as a new organic-inorganic hybrid material for photovoltaic applications.The addition of eumelanin, whose absorption in the near infrared region is significantly higher than porous silicon, should greatly enhance the light absorption capabilities of the empty porous silicon matrix, which are very low in the low energy side of the visible spectral range (from about 600 nm downwards).The experimental results show that indeed the photocarrier collection efficiency at longer wavelengths in eumelanin-impregnated samples is clearly higher with respect to empty porous silicon matrices.

View Article: PubMed Central - HTML - PubMed

Affiliation: Dipartimento di Fisica, Cittadella Universitaria di Monserrato, Università degli Studi di Cagliari, S,P, 8 km 0,7, Monserrato (Ca), 09042, Italy. guido.mula@unica.it.

ABSTRACT
A bulk heterojunction of porous silicon and eumelanin, where the columnar pores of porous silicon are filled with eumelanin, is proposed as a new organic-inorganic hybrid material for photovoltaic applications. The addition of eumelanin, whose absorption in the near infrared region is significantly higher than porous silicon, should greatly enhance the light absorption capabilities of the empty porous silicon matrix, which are very low in the low energy side of the visible spectral range (from about 600 nm downwards). The experimental results show that indeed the photocarrier collection efficiency at longer wavelengths in eumelanin-impregnated samples is clearly higher with respect to empty porous silicon matrices.

No MeSH data available.


Literature absorption coefficients dispersion curves for PSi, Si and eumelanin. Comparison of the absorption coefficients dispersion curves reported in literature for several materials: eumelanin film, thin (80 nm, full squares), and thick (800 nm, empty squares), [16]; 58 % porosity p-type (inverted triangles) and 78 % p+-type (upright triangles) porous Si, [44]; and bulk Si (full circles) [46]. The plot shows how the absorption coefficient of eumelanin is significantly larger than that of PSi, becoming more than one order of magnitude larger for wavelengths longer than about 650 nm. It is worth noting that this is also valid with respect to the undoped bulk Si.
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Figure 6: Literature absorption coefficients dispersion curves for PSi, Si and eumelanin. Comparison of the absorption coefficients dispersion curves reported in literature for several materials: eumelanin film, thin (80 nm, full squares), and thick (800 nm, empty squares), [16]; 58 % porosity p-type (inverted triangles) and 78 % p+-type (upright triangles) porous Si, [44]; and bulk Si (full circles) [46]. The plot shows how the absorption coefficient of eumelanin is significantly larger than that of PSi, becoming more than one order of magnitude larger for wavelengths longer than about 650 nm. It is worth noting that this is also valid with respect to the undoped bulk Si.

Mentions: These results are in agreement with the reported literature absorption coefficients of eumelanin and PSi. To show this, in Figure 6, we plot the absorption coefficients of 78 % p+-type and 58 % p-type porous Si [44], bulk Si [46], and eumelanin [16]. The absorption coefficients dispersion curves for eumelanin have been obtained from thin (80 nm) and thick (800 nm) film. All symbols are explained in the figure caption.


Photovoltaic properties of PSi impregnated with eumelanin.

Mula G, Manca L, Setzu S, Pezzella A - Nanoscale Res Lett (2012)

Literature absorption coefficients dispersion curves for PSi, Si and eumelanin. Comparison of the absorption coefficients dispersion curves reported in literature for several materials: eumelanin film, thin (80 nm, full squares), and thick (800 nm, empty squares), [16]; 58 % porosity p-type (inverted triangles) and 78 % p+-type (upright triangles) porous Si, [44]; and bulk Si (full circles) [46]. The plot shows how the absorption coefficient of eumelanin is significantly larger than that of PSi, becoming more than one order of magnitude larger for wavelengths longer than about 650 nm. It is worth noting that this is also valid with respect to the undoped bulk Si.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3420258&req=5

Figure 6: Literature absorption coefficients dispersion curves for PSi, Si and eumelanin. Comparison of the absorption coefficients dispersion curves reported in literature for several materials: eumelanin film, thin (80 nm, full squares), and thick (800 nm, empty squares), [16]; 58 % porosity p-type (inverted triangles) and 78 % p+-type (upright triangles) porous Si, [44]; and bulk Si (full circles) [46]. The plot shows how the absorption coefficient of eumelanin is significantly larger than that of PSi, becoming more than one order of magnitude larger for wavelengths longer than about 650 nm. It is worth noting that this is also valid with respect to the undoped bulk Si.
Mentions: These results are in agreement with the reported literature absorption coefficients of eumelanin and PSi. To show this, in Figure 6, we plot the absorption coefficients of 78 % p+-type and 58 % p-type porous Si [44], bulk Si [46], and eumelanin [16]. The absorption coefficients dispersion curves for eumelanin have been obtained from thin (80 nm) and thick (800 nm) film. All symbols are explained in the figure caption.

Bottom Line: A bulk heterojunction of porous silicon and eumelanin, where the columnar pores of porous silicon are filled with eumelanin, is proposed as a new organic-inorganic hybrid material for photovoltaic applications.The addition of eumelanin, whose absorption in the near infrared region is significantly higher than porous silicon, should greatly enhance the light absorption capabilities of the empty porous silicon matrix, which are very low in the low energy side of the visible spectral range (from about 600 nm downwards).The experimental results show that indeed the photocarrier collection efficiency at longer wavelengths in eumelanin-impregnated samples is clearly higher with respect to empty porous silicon matrices.

View Article: PubMed Central - HTML - PubMed

Affiliation: Dipartimento di Fisica, Cittadella Universitaria di Monserrato, Università degli Studi di Cagliari, S,P, 8 km 0,7, Monserrato (Ca), 09042, Italy. guido.mula@unica.it.

ABSTRACT
A bulk heterojunction of porous silicon and eumelanin, where the columnar pores of porous silicon are filled with eumelanin, is proposed as a new organic-inorganic hybrid material for photovoltaic applications. The addition of eumelanin, whose absorption in the near infrared region is significantly higher than porous silicon, should greatly enhance the light absorption capabilities of the empty porous silicon matrix, which are very low in the low energy side of the visible spectral range (from about 600 nm downwards). The experimental results show that indeed the photocarrier collection efficiency at longer wavelengths in eumelanin-impregnated samples is clearly higher with respect to empty porous silicon matrices.

No MeSH data available.