Multiexciton Solar Cells of CuInSe2 Nanocrystals. Academic Article

abstract

• Peak external quantum efficiencies (EQEs) of just over 120% were observed in photovoltaic (PV) devices of CuInSe2 nanocrystals prepared with a photonic curing process. The extraction of more than one electron/hole pair as a result of the absorption of a single photon can occur if multiple excitons are generated and extracted. Multiexciton generation (MEG) in the nanocrystal films was substantiated by transient absorption spectroscopy. We propose that photonic curing leads to sufficient electronic coupling between nanocrystals to enable multiexciton extraction under typical solar illumination conditions. Under low light conditions, however, the EQE drops significantly, indicating that photonic curing-induced ligand desorption creates a significant amount of traps in the film that limit the overall power conversion efficiency of the device.

authors

• Harvey, Taylor

published proceedings

• J Phys Chem Lett

altmetric score

• 14.25

author list (cited authors)

• Stolle, C. J., Harvey, T. B., Pernik, D. R., Hibbert, J. I., Du, J., Rhee, D. J., ... Korgel, B. A.

citation count

• 76

complete list of authors

• Stolle, C Jackson||Harvey, Taylor B||Pernik, Douglas R||Hibbert, Jarett I||Du, Jiang||Rhee, Dong Joon||Akhavan, Vahid A||Schaller, Richard D||Korgel, Brian A

publication date

• January 2014

publisher

• American Chemical Society (ACS)  Publisher

published in

• Journal of Physical Chemistry Letters  Journal

keywords

• Cigs
• Multiple Excitons
• Nanocrystals
• Photonic Curing
• Photovoltaics
• Solar Cells

PubMed Central ID

• 26270704

Digital Object Identifier (DOI)

• 10.1021/jz402596v

start page

• 304

end page

• 309

volume

• 5

issue

• 2

URL

• http://dx.doi.org/10.1021/jz402596v