Singlet exciton fission-sensitized infrared quantum dot solar cells.
Nano Lett
; 12(2): 1053-7, 2012 Feb 08.
Article
em En
| MEDLINE
| ID: mdl-22257168
ABSTRACT
We demonstrate an organic/inorganic hybrid photovoltaic device architecture that uses singlet exciton fission to permit the collection of two electrons per absorbed high-energy photon while simultaneously harvesting low-energy photons. In this solar cell, infrared photons are absorbed using lead sulfide (PbS) nanocrystals. Visible photons are absorbed in pentacene to create singlet excitons, which undergo rapid exciton fission to produce pairs of triplets. Crucially, we identify that these triplet excitons can be ionized at an organic/inorganic heterointerface. We report internal quantum efficiencies exceeding 50% and power conversion efficiencies approaching 1%. These findings suggest an alternative route to circumvent the Shockley-Queisser limit on the power conversion efficiency of single-junction solar cells.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fontes de Energia Elétrica
/
Energia Solar
/
Pontos Quânticos
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Nano Lett
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Reino Unido