Bulk heterojunction films made of polychiral single-walled carbon nanotubes (SWCNTs) form efficient heterojunction solar cells with n-type crystalline silicon (n-Si), due to their superior electronic, optical, and electrical properties. The films are multi-functional, since their hierarchical surface morphology provides a biomimetical anti-reflective, air-stable, and hydrophobic encapsulation for Si. Also, the films have a large effective area conferring them high optical absorption, which actively contribute to the solar energy harvesting together with Si. Here, we report photovoltaic devices with photoconversion efficiency up to 12% and a record 100% internal quantum efficiency (IQE). Such unprecedented IQE value is truly remarkable and indicates that every absorbed photon from the device, at some wavelengths, generates a pair of separated charge carriers, which are collected at the electrodes. The SWCNT/Si devices favor high and broadband carrier photogeneration; charge dissociation of ultra-fast hot excitons; transport of electrons through n-Si and high-mobility holes through the SWCNT percolative network. Moreover, by varying the film thickness, it is possible to tailor the physical properties of such a two-dimensional interacting system, therefore the overall device features. These results not only pave the way for lowcost, high-efficient, and broadband photovoltaics, but also are promising for the development of generic SWCNT-based optoelectronic applications.

De Nicola, F., Salvato, M., Cirillo, C., Crivellari, M., Boscardin, M., Passacantando, M., et al. (2017). 100% internal quantum efficiency in polychiral single-walled carbon nanotube bulk heterojunction/silicon solar cells. CARBON, 114, 402-410 [10.1016/j.carbon.2016.12.050].

100% internal quantum efficiency in polychiral single-walled carbon nanotube bulk heterojunction/silicon solar cells

DE NICOLA, FRANCESCO;SALVATO, MATTEO;DE MATTEIS, FABIO;DE CRESCENZI, MAURIZIO;CASTRUCCI, PAOLA
2017

Abstract

Bulk heterojunction films made of polychiral single-walled carbon nanotubes (SWCNTs) form efficient heterojunction solar cells with n-type crystalline silicon (n-Si), due to their superior electronic, optical, and electrical properties. The films are multi-functional, since their hierarchical surface morphology provides a biomimetical anti-reflective, air-stable, and hydrophobic encapsulation for Si. Also, the films have a large effective area conferring them high optical absorption, which actively contribute to the solar energy harvesting together with Si. Here, we report photovoltaic devices with photoconversion efficiency up to 12% and a record 100% internal quantum efficiency (IQE). Such unprecedented IQE value is truly remarkable and indicates that every absorbed photon from the device, at some wavelengths, generates a pair of separated charge carriers, which are collected at the electrodes. The SWCNT/Si devices favor high and broadband carrier photogeneration; charge dissociation of ultra-fast hot excitons; transport of electrons through n-Si and high-mobility holes through the SWCNT percolative network. Moreover, by varying the film thickness, it is possible to tailor the physical properties of such a two-dimensional interacting system, therefore the overall device features. These results not only pave the way for lowcost, high-efficient, and broadband photovoltaics, but also are promising for the development of generic SWCNT-based optoelectronic applications.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/03 - Fisica della Materia
English
Con Impact Factor ISI
Third generation solar cell; Photovoltaic; Bulk heterojunction; Single-walled carbon nanotube; Internal quantum efficiency; Silicon; Air-stable; incapsulation; Anti-reflective coating; Hydrophobic film
De Nicola, F., Salvato, M., Cirillo, C., Crivellari, M., Boscardin, M., Passacantando, M., et al. (2017). 100% internal quantum efficiency in polychiral single-walled carbon nanotube bulk heterojunction/silicon solar cells. CARBON, 114, 402-410 [10.1016/j.carbon.2016.12.050].
DE NICOLA, F; Salvato, M; Cirillo, C; Crivellari, M; Boscardin, M; Passacantando, M; Nardone, M; DE MATTEIS, F; Motta, N; DE CRESCENZI, M; Castrucci, P
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/173615
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