30% Increase in Available Photons per Cell Area Using Nanoelement Array Light Trapping in 700-nm-Thick nc-Si Solar Cells

We fabricated nc-Si light trapping cells that produced photocurrents 30% higher than those of controls. Computer studies using experimentally determined, self-consistent TCO and nc-Si thicknesses showed this nanodome design is capable of producing J_{{\rm sc}}\sim30 mA/cm 2 with only 10% of the nc-S...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:IEEE journal of photovoltaics 2015-01, Vol.5 (1), p.28-32
Hauptverfasser: Wook Jun Nam, Fischer, Diego, Gray, Zachary, Nghia Nguyen, Liming Ji, Neidich, Douglas, Fonash, Stephen J.
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:We fabricated nc-Si light trapping cells that produced photocurrents 30% higher than those of controls. Computer studies using experimentally determined, self-consistent TCO and nc-Si thicknesses showed this nanodome design is capable of producing J_{{\rm sc}}\sim30 mA/cm 2 with only 10% of the nc-Si absorber volume needed by the corresponding planar cell. Interestingly, these experimental and computer modeling results were both attained with a nanodome spacing of 1250 nm, a value almost twice that suggested in other studies of similar structures. The fabricated cells had photocurrents that were reverse bias dependent. FESEM studies showed this effect correlated with the presence of a curtain of nc-Si defects surrounding each nanodome. These defects are similar to those seen earlier by other workers using nc-Si cells with larger feature sizes. A model for this voltage dependent photocurrent behavior is presented. This model and a discussion of the Voc performance origins show that deposition procedures and material defects are holding this architecture back from its potential.
ISSN:2156-3381
2156-3403
DOI:10.1109/JPHOTOV.2014.2363565