Solar Energy Materials and Solar Cells, Dec 1, 2015
Abstract A soft chemical route has been employed to synthesize ZnO@CuInS 2 (ZnO@CIS) core–shell h... more Abstract A soft chemical route has been employed to synthesize ZnO@CuInS 2 (ZnO@CIS) core–shell hexagonal nanopyramids using 2-mercaptopropionic acid as a surface-functionalized agent. The core–shell formation was confirmed by the X-ray diffraction, high resolution transmission electron microscope and X-ray photoelectron spectroscopy characterizations. UV–visible absorption spectrum of the core–shell nanopyramids shows a red shift of the band edge of pure ZnO in the visible region along with broadening of the absorption spectrum. ZnO@CIS nanopyramids can be used as an antireflection coating on Silicon solar cell, exhibit lower reflectance and better light trapping ability than the Silicon solar cell with ZnO nanopyramids. Moreover higher photocurrent is obtained for the n-ZnO/n-CIS core–shell junction due to favorable band bending. The efficiency of the p-Si/n-ZnO solar cell (6.6%) is improved to 10% for p-Si/n-ZnO@n-CIS configuration.
We report a robust methodology for synthesizing monodisperse alloyed Bi2S3–xSex nanorods (NRs) to... more We report a robust methodology for synthesizing monodisperse alloyed Bi2S3–xSex nanorods (NRs) to tune optical properties with the variation of Se concentration. The intercalation of Cu(I) into the presynthetic Bi2S3–xSex NRs converted to ternary Cu3BiS3–xSex NRs via cation exchange process. The transformation was monitored through the formation of core/shell Bi2S3–xSex/Cu3BiS3–xSex nanorod heterostructures. Shape anisotropy results in near-infrared bimodal localized surface plasmon resonance (LSPR) in Cu3BiS3–xSex nanorod over a broad range from 600 to 3500 nm with increase of Se:S ratio. The LSPR sensitivity, defined as the change in the LSPR peak wavelength per unit change in the refractive index (RI) of the medium, was estimated to be 250–350 nm/RI unit, much higher than other copper chalcogenides like Cu2S/Cu2Se. A fast photodetector was fabricated by Cu3BiS3–xSex NRs with high photocurrent gain value (∼125) with Se alloying. The intrinsic Cu vacancies and the effective mass of charge carriers play i...
Copper-rich nitride (Cu3N) nanocrystals have been synthesized by thermal decomposition of copper ... more Copper-rich nitride (Cu3N) nanocrystals have been synthesized by thermal decomposition of copper nitrate (Cu(NO3)2, 3H2O) in the presence of oleylamine and 1-octadecene. Thermal- and light-induced ...
A type-II band alignment between Bi2S3 and SnS2 was established by theoretical investigation whic... more A type-II band alignment between Bi2S3 and SnS2 was established by theoretical investigation which accelerates photoinduced charge separation and improved the photocatalytic activity of the Bi2S3/SnS2 heterostructure.
This work reports a flexible and wearable nanocomposite made of nitrogenous carbon dot (N-CD) mod... more This work reports a flexible and wearable nanocomposite made of nitrogenous carbon dot (N-CD) modified PVDF (PCD) nanocomposite assisted piezoelectric device (PPNCD) that can harvest different forms of mechanical energy and convert them into electrical energy. The efficacy of this device is dependent upon its ‘sandwiched’ structure made of PCD nanocomposite wrapped with aluminum electrodes on both sides. Herein, the polarizability of the PCD nanocomposite has a great contribution to the total output performance of the device. The polarizability of the film has been measured by using a standard density functional approach. The piezoelectric coefficient (d33) has also been calculated, which is found to be 29 pC/N. Such augmented electrical parameters and enhanced piezoelectric coefficient are further utilized to fabricate the PPNCD device, which is capable to detect human body movements efficiently and can act as a weight sensor with a sensitivity of 10.2 V/kPa (up to 0.5 kPa). Moreov...
Solar Energy Materials and Solar Cells, Dec 1, 2015
Abstract A soft chemical route has been employed to synthesize ZnO@CuInS 2 (ZnO@CIS) core–shell h... more Abstract A soft chemical route has been employed to synthesize ZnO@CuInS 2 (ZnO@CIS) core–shell hexagonal nanopyramids using 2-mercaptopropionic acid as a surface-functionalized agent. The core–shell formation was confirmed by the X-ray diffraction, high resolution transmission electron microscope and X-ray photoelectron spectroscopy characterizations. UV–visible absorption spectrum of the core–shell nanopyramids shows a red shift of the band edge of pure ZnO in the visible region along with broadening of the absorption spectrum. ZnO@CIS nanopyramids can be used as an antireflection coating on Silicon solar cell, exhibit lower reflectance and better light trapping ability than the Silicon solar cell with ZnO nanopyramids. Moreover higher photocurrent is obtained for the n-ZnO/n-CIS core–shell junction due to favorable band bending. The efficiency of the p-Si/n-ZnO solar cell (6.6%) is improved to 10% for p-Si/n-ZnO@n-CIS configuration.
We report a robust methodology for synthesizing monodisperse alloyed Bi2S3–xSex nanorods (NRs) to... more We report a robust methodology for synthesizing monodisperse alloyed Bi2S3–xSex nanorods (NRs) to tune optical properties with the variation of Se concentration. The intercalation of Cu(I) into the presynthetic Bi2S3–xSex NRs converted to ternary Cu3BiS3–xSex NRs via cation exchange process. The transformation was monitored through the formation of core/shell Bi2S3–xSex/Cu3BiS3–xSex nanorod heterostructures. Shape anisotropy results in near-infrared bimodal localized surface plasmon resonance (LSPR) in Cu3BiS3–xSex nanorod over a broad range from 600 to 3500 nm with increase of Se:S ratio. The LSPR sensitivity, defined as the change in the LSPR peak wavelength per unit change in the refractive index (RI) of the medium, was estimated to be 250–350 nm/RI unit, much higher than other copper chalcogenides like Cu2S/Cu2Se. A fast photodetector was fabricated by Cu3BiS3–xSex NRs with high photocurrent gain value (∼125) with Se alloying. The intrinsic Cu vacancies and the effective mass of charge carriers play i...
Copper-rich nitride (Cu3N) nanocrystals have been synthesized by thermal decomposition of copper ... more Copper-rich nitride (Cu3N) nanocrystals have been synthesized by thermal decomposition of copper nitrate (Cu(NO3)2, 3H2O) in the presence of oleylamine and 1-octadecene. Thermal- and light-induced ...
A type-II band alignment between Bi2S3 and SnS2 was established by theoretical investigation whic... more A type-II band alignment between Bi2S3 and SnS2 was established by theoretical investigation which accelerates photoinduced charge separation and improved the photocatalytic activity of the Bi2S3/SnS2 heterostructure.
This work reports a flexible and wearable nanocomposite made of nitrogenous carbon dot (N-CD) mod... more This work reports a flexible and wearable nanocomposite made of nitrogenous carbon dot (N-CD) modified PVDF (PCD) nanocomposite assisted piezoelectric device (PPNCD) that can harvest different forms of mechanical energy and convert them into electrical energy. The efficacy of this device is dependent upon its ‘sandwiched’ structure made of PCD nanocomposite wrapped with aluminum electrodes on both sides. Herein, the polarizability of the PCD nanocomposite has a great contribution to the total output performance of the device. The polarizability of the film has been measured by using a standard density functional approach. The piezoelectric coefficient (d33) has also been calculated, which is found to be 29 pC/N. Such augmented electrical parameters and enhanced piezoelectric coefficient are further utilized to fabricate the PPNCD device, which is capable to detect human body movements efficiently and can act as a weight sensor with a sensitivity of 10.2 V/kPa (up to 0.5 kPa). Moreov...
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