Broadband absorption in Au nanoparticle-decorated chlorophyll b for biophotonic applications

Mondal, Hasmat; Chakrabarty, Poulomi; Sarkar, Anish; Gangopadhyay, Gaurab; Basori, Rabaya; Ray, S. K.

doi:10.1109/icee44586.2018.8937943

Cited by 1 publication

(2 citation statements)

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“…Optical absorption spectra of different concentrations of Chl-b solution dispersed in methanol are shown in Figure a. The principal absorption peak in the red region at 665 nm corresponds to Q band and confirms the presence of Chl-b. , This peak arises from the direct band gap of the Chl-b molecule. Another intense peak is found toward the blue region and at a slightly different position for different concentrations of Chl-b in the methanol solution.…”

Section: Results and Discussionmentioning

confidence: 84%

“…The reverse saturation current, I 0 , can be expressed as follows , where, ϕ b , A , and A * represent the barrier height value for the fabricated device, effective device area, and the Richardson constant (value ∼ 32 A/cm –2 K –2 for p -type Si), respectively. The barrier height, ϕ b , and ideality factor, n , are two important parameters for such devices and can be calculated using the equations and …”

Section: Results and Discussionmentioning

confidence: 99%

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High-Performance Chlorophyll-b/Si Nanowire Heterostructure for Self-Biasing Bioinorganic Hybrid Photodetectors

Mondal

Ray

Chakrabarty

et al. 2021

ACS Appl. Nano Mater.

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As one kind of ecofriendly organic semiconductor materials, chlorophyll has attracted great attention with useful optical properties. Although pigments such as chlorophyll-a (Chl-a) are explored widely, chlorophyll-b (Chl-b) is rarely studied even though it possesses outstanding optical properties with impressive stability. Here, Chl-b is extracted from spinach leaves using a very simple and cost-effective method to study its potential use on Si nanowire (NW) heterostructures having volume concentration varying from 0 to 6%. In comparison to the control Si NW device, the Chl-b/SiNW heterostructure exhibits superior optoelectronic performances including high on/off ratio (∼10 3 ), good external quantum efficiency (∼208%), high responsivity (∼0.73 A/W), improved detectivity (∼2.2 × 10 12 Jones), and relatively faster response time (<1 s) under 435 nm illumination. In addition, it offers quite promising values of the abovementioned figure of merits of a photodetector over the wide spectral range from 350−1100 nm. This low-cost and high-sensitivity Chl-b/SiNW heterostructure device thus opens up challenging research possibilities for green energy conversion and biophotonic applications on Si-compatible complementary metal−oxide−semiconductor platforms.

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Section: Results and Discussionmentioning

confidence: 84%