Dramatic efficiency boost of single-walled carbon nanotube-silicon hybrid solar cells through exposure to ppm nitrogen dioxide in air: An ab-initio assessment of the measured device performances

Stefania Pagliara, Giovanni Drera, Luigi Ermenegildo Sangaletti, Sonia Freddi, Simona Achilli, Raffaella Soave, Francesco De Nicola, Maurizio De Crescenzi, Paola Castrucci

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

3 Citazioni (Scopus)

Abstract

We observed a 73% enhancement of the power conversion efficiency (PCE) of a photovoltaic cell based on a single wall carbon nanotube/Si hybrid junction after exposing the device to a limited amount (10 ppm) of NO2 diluted in dry air. On the basis of a computational modeling of the junction, this enhancement is discussed in terms of both carbon nanotube (CNT) p-doping, induced by the interaction with the oxidizing molecules, and work function changes across the junction. Unlike studies so far reported, where the PCE enhancement was correlated only qualitatively to CNT doping, our study (i) provides a novel and reversible path to tune and considerably enhance the cell efficiency by a few ppm gas exposure, and (ii) shows computational results that quantitatively relate the observed effects to the electrostatics of the cell through a systematic calculation of the work function. These effects have been cross-checked by exposing the cell to reducing molecules (i.e·NH3) that resulted to be detrimental to the cell efficiency, consistently with the theoretical ab-initio calculations.
Lingua originaleEnglish
pagine (da-a)60-68
Numero di pagine9
RivistaJournal of Colloid and Interface Science
Volume566
DOI
Stato di pubblicazionePubblicato - 2020

Keywords

  • Ab-initio calculations
  • Solar cells
  • sensors
  • solar cells

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