Articolo in rivista, 2015, ENG, 10.1088/0022-3727/48/36/365101
Ram, Sanjay K.; Rizzoli, Rita; Desta, Derese; Jeppesen, Bjarke R.; Bellettato, Michele; Samatov, Ivan; Tsao, Yao Chung; Johannsen, Sabrina R.; Neuvonen, Pekka T.; Pedersen, Thomas Garm; Pereira, Rui N.; Pereira, Rui N.; Pedersen, Kjeld; Balling, Peter; Larsen, Arne Nylandsted
Aarhus Universitet; Consiglio Nazionale delle Ricerche; Universidade de Aveiro; Aalborg Universitet; Walter Schottky Institute
A novel, scalable, and low-cost strategy for fabricating sub-wavelength scale hierarchical nanostructures by direct patterning of TiO<inf>2</inf> nanoparticles on glass substrates is reported. Two nanostructural designs of light-trapping back-surface reflectors (BSR) have been fabricated for increasing the photon-harvesting properties of thin-film solar cells: a quasi-periodic nano-crater design and a random nano-bump design. The efficient light-scattering properties of the nano-crater design over a broad wavelength range are demonstrated by the measured haze factor being larger than 40% at wavelengths (~700 nm) near the band edge of amorphous silicon (a-Si:H). The a-Si:H-based n-i-p solar cell fabricated with an only ~200 nm thick absorber layer on the nano-crater BSR shows a short-circuit current density (J <inf>sc</inf>) of ~16.1 mA cm<sup>-2</sup> representing a 28% enhancement compared to the cell deposited on a non-textured flat substrate. Measurements of the external quantum efficiency of the cell fabricated on the quasi-periodic nano-crater surface at long wavelengths, ? > 700 nm, demonstrate an increase of a factor of 5 relative to that of a flat reference solar cell. The theoretical modeling results of optical absorption corroborate well with the experimental findings and are used to identify the volumes of strong optical absorption in the a-Si:H active layer of the textured BSR devices.
Journal of physics. D, Applied physics (Print) 48 (36), pp. 365101–365111
light trapping, nanomolding, nanoparticles, photovoltaic devices, silicon, solar cells, thin films
Bellettato Michele, Rizzoli Rita
ID: 348851
Year: 2015
Type: Articolo in rivista
Creation: 2016-03-01 12:43:32.000
Last update: 2021-03-11 17:09:37.000
CNR authors
CNR institutes
External links
OAI-PMH: Dublin Core
OAI-PMH: Mods
OAI-PMH: RDF
DOI: 10.1088/0022-3727/48/36/365101
URL: http://www.scopus.com/record/display.url?eid=2-s2.0-84940121382&origin=inward
External IDs
CNR OAI-PMH: oai:it.cnr:prodotti:348851
DOI: 10.1088/0022-3727/48/36/365101
Scopus: 2-s2.0-84940121382